JP7315066B2 - Communication device and computer program for the communication device - Google Patents

Description

This specification discloses a technology related to a communication device capable of establishing a wireless connection with an external device.

Non-Patent Document 1 describes a wireless communication method called Device Provisioning Protocol (hereinafter referred to as “DPP method”) that is scheduled to be formulated by the Wi-Fi Alliance. In the DPP method, for example, wireless communication according to the DPP method is performed in response to the establishment of an NFC connection between the first device and the second device.

Japanese Patent Application Laid-Open No. 2018-37978

"DRAFT Device Provisioning Protocol Technical Specification Version 0.2.11" Wi-Fi Alliance, 2017

Disclosed herein is a novel technique for utilizing a first external device to establish a second wireless connection between a communication device and a second external device.

A communication device disclosed by the present specification includes a display unit, a first wireless interface, a second wireless interface different from the first wireless interface, and a control unit, wherein the control unit causes the display unit to display an instruction screen for instructing execution of target processing including transmission of a public key when a first wireless connection is established between the communication apparatus and a first external device via the first wireless interface; a first supply unit configured to supply first instruction information for instructing transmission of the public key to the first wireless interface when an instruction to execute a target process is given, wherein the first instruction information is not supplied to the first wireless interface when an instruction to perform the target process is not given in a situation where the instruction screen is displayed, wherein the first wireless interface transmits the public key to the first wireless interface after acquiring the first instruction information from the control unit an authentication request receiving unit for receiving an authentication request using the public key from the first external device via the second wireless interface after the public key is transmitted to the first external device; an authentication response transmitting unit for transmitting an authentication response to the authentication request to the first external device via the second wireless interface when the authentication request is received from the first external device; a connection information receiving unit configured to receive connection information from the first external device via the second wireless interface after being transmitted to the first external device, wherein the connection information is information for establishing a second wireless connection between the communication device and the second external device via the second wireless interface; and a first establishing unit that establishes the second wireless connection via the second wireless interface between.

According to the above configuration, the communication device displays the instruction screen when the first wireless connection is established with the first external device. In the situation where the instruction screen is displayed, when it is instructed to execute the target process, the first instruction information instructing transmission of the public key is supplied to the first wireless interface. As a result, the first wireless interface transmits the public key to the first external device. Thereby, the communication device can receive an authentication request using a public key from the first external device, transmit an authentication response to the first external device, receive connection information from the first external device, and use the connection information to establish a second wireless connection with the second external device. On the other hand, the first instruction information is not supplied to the first wireless interface if execution of the target process is not instructed while the instruction screen is displayed. As a result, the public key is not transmitted to the first external device via the first wireless interface, so the communication device does not receive the authentication request using the public key from the first external device and does not establish the second wireless connection with the second external device. Thus, according to the present technology, it is possible to switch whether to establish the second wireless connection between the communication device and the second external device.

Further, the communication device disclosed by the present specification includes a first wireless interface, a second wireless interface different from the first wireless interface, and a controller, wherein the controller is a state transition unit that transitions the operating state of the communication device from the disabled state to the enabled state after a first wireless connection is established between the communication device and the first external device via the first wireless interface, wherein the disabled state is an authentication request using a public key received from the first external device. and the possible state is a state of transmitting the authentication response to the first external device in response to receiving the authentication request from the first external device. an authentication request receiving unit for receiving the authentication request from the first external device via the second wireless interface; an authentication response transmitting unit for transmitting the authentication response to the first external device via the second wireless interface when the authentication request is received from the first external device after the operation state of the communication device is shifted to the enabled state; a connection information receiving unit configured to receive connection information via a wireless interface, wherein the connection information is information for establishing a second wireless connection between the communication device and a second external device via the second wireless interface; and a first establishment unit configured to establish the second wireless connection between the communication device and the second external device via the second wireless interface using the connection information when the connection information is received from the first external device. , may be provided.

According to the above configuration, the communication device transitions from the disabled state to the enabled state after the first wireless connection with the first external device is established. Thereby, the communication device can receive an authentication request using a public key from the first external device, transmit an authentication response to the first external device, receive connection information from the first external device, and use the connection information to establish a second wireless connection with the second external device. The communication device does not transition to the Enabled state, which is a higher processing load than the Disabled state, before the first wireless connection is established with the first external device. For this reason, the processing load on the communication device can be reduced in the technique of establishing the second wireless connection between the communication device and the second external device using the first external device.

A computer program for implementing the above communication device and a computer-readable recording medium storing the computer program are also novel and useful. The method performed by the communication device described above is also novel and useful. A communication system comprising the communication device described above and other devices (eg, a first external device, a second external device) is also novel and useful.

1 shows the configuration of a communication system; FIG. 2 shows an explanatory diagram for explaining the outline of the present embodiment. FIG. 12 is a sequence diagram of the bootstrapping process of case A; FIG. FIG. 4 shows a sequence diagram of processing of Authentication. FIG. 10 is a sequence diagram of Configuration processing; FIG. 4 shows a sequence diagram of Network Access processing. FIG. 11 is a sequence diagram of the bootstrapping process of case B; FIG. FIG. 12 is a sequence diagram of the bootstrapping process of case C; FIG. FIG. 4 shows a sequence diagram of processing for establishing a Wi-Fi connection between a printer and a terminal;

(Configuration of communication system 2; Fig. 1)
As shown in FIG. 1 , the communication system 2 includes an AP (abbreviation for Access Point) 6 , a terminal 10 and a printer 100 . In this embodiment, it is assumed that the user uses the terminal 10 to establish a wireless connection (hereinafter referred to as "Wi-Fi connection") according to the Wi-Fi method between the printer 100 and the AP 6.

(Configuration of terminal 10)
The terminal 10 is a portable terminal device such as a mobile phone (for example, smart phone), PDA, tablet PC, or the like. Note that in a modification, the terminal 10 may be a stationary PC, a notebook PC, or the like. Terminal 10 comprises a Wi-Fi interface 16 and an NFC interface 18 . Below, the interface is simply described as "I/F". The terminal 10 also stores a connection application 40 (hereinafter simply referred to as "application 40"). The application 40 is a program for establishing a Wi-Fi connection between the printer 100 and the AP 6, and is installed in the terminal 10 from a server on the Internet provided by the vendor of the printer 100, for example.

A Wi-Fi I/F 16 is a wireless interface for performing Wi-Fi communication according to the Wi-Fi system. The Wi-Fi system is a wireless communication system for performing wireless communication according to, for example, the IEEE (abbreviation of The Institute of Electrical and Electronics Engineers, Inc.) 802.11 standard and its equivalent standards (eg, 802.11a, 11b, 11g, 11n, etc.). In particular, the Wi-Fi I/F 16 supports the WFD (abbreviation for Wi-Fi Direct (registered trademark)) method formulated by the Wi-Fi Alliance and the DPP (abbreviation for Device Provisioning Protocol) method to be formulated by the Wi-Fi Alliance. The WFD system is a wireless communication system described in the standard "Wi-Fi Peer-to-Peer (P2P) Technical Specification Version 1.1" created by the Wi-Fi Alliance. The WFD standard defines three states of a WFD device: a Group Owner state (hereinafter referred to as a "G/O state"), a client state, and a device state. A WFD appliance is selectively operable in one of the three states described above. The DPP method is described in "DRAFT Device Provisioning Protocol Technical Specification Version 0.2.11", which is a draft of a standard created by the Wi-Fi Alliance, and is a wireless communication method for easily establishing a Wi-Fi connection between a pair of devices (for example, a printer 100 and an AP 6) using a terminal 10.

The NFCI/F 18 is an I/F for executing NFC communication according to the NFC system. The NFC system is a wireless communication system based on international standards such as ISO/IEC14443, 15693, 18092, for example. As types of I/Fs for executing NFC communication, an I/F called an NFC Forum Device and an I/F called an NFC Forum Tag are known. In this embodiment, NFCI/F18 is an NFC Forum device.

(Configuration of Printer 100)
The printer 100 is a peripheral device capable of executing a print function (for example, a peripheral device of the terminal 10). Printer 100 includes operation unit 112 , display unit 114 , Wi-Fi I/F 116 , NFCI/F 118 , print execution unit 120 , and control unit 130 . Each unit 112 to 130 is connected to a bus line (reference numerals omitted).

The operation unit 112 has a plurality of keys. A user can input various instructions to the printer 100 by operating the operation unit 112 . The display unit 114 is a display for displaying various information. The print execution unit 120 includes a printing mechanism such as an inkjet method or a laser method.

Wi-Fi I/F 116 is similar to Wi-Fi I/F 16 of terminal 10 . That is, the Wi-Fi I/F 116 supports the WFD method and the DPP method. Therefore, the printer 100 can establish a Wi-Fi connection with the AP 6 according to the DPP method, and further can establish a Wi-Fi connection with the terminal 10 according to the WFD method. Also, the Wi-Fi I/F 116 has a MAC address “abc”. NFCI/F 118 is similar to NFCI/F 18 of terminal 10 except that it is an NFC Forum tag. Note that, in a modified example, the NFCI/F 118 may be an NFC Forum device. The NFCI/F 118 also includes a memory 119 .

Here, differences between Wi-Fi communication and NFC communication will be described. The communication speed of Wi-Fi communication (for example, the maximum communication speed is 11 to 600 Mbps) is faster than the communication speed of NFC communication (for example, the maximum communication speed is 100 to 424 Kbps). In addition, the frequency of carrier waves in Wi-Fi communication (eg, 2.4 GHz band or 5.0 GHz band) is different from the frequency of carrier waves in NFC communication (eg, 13.56 MHz band). Also, the maximum distance over which Wi-Fi communication can be performed (eg, up to about 100 m) is greater than the maximum distance over which NFC communication can be performed (eg, up to about 10 cm).

Control unit 130 includes CPU 132 and memory 134 . CPU 132 executes various processes according to programs 136 stored in memory 134 . The memory 134 is composed of a volatile memory, a nonvolatile memory, or the like.

(Specific examples; Figures 2 to 9)
Next, specific examples of processing executed by each device 6, 10, 100 will be described with reference to FIGS. 2 to 9. FIG. First, processing for establishing a Wi-Fi connection between the printer 100 and the AP 6 will be described with reference to FIGS. 2 to 8. FIG.

(Outline of processing for connection with AP6; Fig. 2)
First, with reference to FIG. 2, an outline of processing for establishing a Wi-Fi connection between the printer 100 and the AP 6 will be described. As mentioned above, the terminal 10 and the printer 100 support the DPP method, and the AP6 also supports the DPP method. In this embodiment, each device 6, 10, 100 establishes a Wi-Fi connection between the printer 100 and the AP 6 by executing communication according to the DPP method. In the following, for ease of understanding, the operations executed by the CPU (for example, the CPU 132, etc.) of each device will be described mainly for each device (for example, the printer 100) instead of mainly for the CPU.

At T5, the terminal 10 performs DPP-based bootstrapping (hereinafter simply referred to as “BS”) with AP6. The BS is a process of providing the terminal 10 with information to be used for authentication of T10 (hereinafter simply referred to as "Auth") from the AP 6 in response to the terminal 10 photographing the QR code (registered trademark) attached to the AP 6.

At T10, the terminal 10 uses the information acquired by the BS at T5 to perform DPP Auth with AP6. The Auth is processing for each of the terminal 10 and the AP 6 to authenticate the communication partner.

At T15, the terminal 10 performs DPP configuration (hereinafter simply referred to as “Config”) with AP6. The Config is a process of transmitting information for establishing Wi-Fi connection between the printer 100 and the AP6 to the AP6. Specifically, in the Config, the terminal 10 generates a first Configuration Object for establishing a Wi-Fi connection between the printer 100 and the AP 6 (hereinafter, the Configuration Object is simply referred to as "CO"), and transmits the first CO to the AP 6. As a result, AP6 stores the first CO.

Next, the terminal 10 executes DPP BS with the printer 100 at T20. The BS is a process of providing the terminal 10 with information used in T25 Auth, which will be described later, from the printer 100 using the NFC connection established between the NFC I/F 18 of the terminal 10 and the NFC I/F 118 of the printer 100 .

At T25, the terminal 10 uses the information acquired by the BS at T20 to perform DPP Auth with the printer 100. FIG. The Auth is processing for each of the terminal 10 and the printer 100 to authenticate a communication partner.

At T<b>30 , the terminal 10 executes DPP Config with the printer 100 . The Config is a process of transmitting information to the printer 100 for establishing a Wi-Fi connection between the printer 100 and the AP6. The terminal 10 generates a second CO for establishing Wi-Fi connection between the printer 100 and the AP 6 in the Config, and transmits the second CO to the printer 100 . As a result, the printer 100 stores the second CO.

At T35, the printer 100 and AP 6 use the stored first and second COs to execute DPP-based Network Access (hereinafter simply referred to as "NA"). NA is processing for sharing a connection key for establishing a Wi-Fi connection between the printer 100 and AP6.

At T40, the printer 100 and AP6 execute 4way-handshake communication. In at least a part of the 4way-handshake communication, the printer 100 and the AP 6 communicate encrypted information encrypted by the connection key shared by NA of T35. Then, when the encryption information is successfully decrypted, a Wi-Fi connection is established between the printer 100 and the AP6. As a result, the printer 100 can participate in the wireless network formed by the AP 6 as a slave station, and as a result, communicate with other devices participating in the wireless network via the AP 6. In a modified example, the printer 100 and the AP 6 may perform SAE (abbreviation for Simultaneous Authentication of Equals, commonly known as “Dragonfly”) communication instead of 4way-handshake communication.

At T45, the printer 100 causes the display unit 114 to display a completion screen indicating that the Wi-Fi connection has been established with the AP6. When the process of T45 ends, the process of FIG. 2 ends.

In the DPP method, in order to establish a Wi-Fi connection between the printer 100 and the AP 6, the user does not need to enter into the printer 100 the information of the wireless network in which the AP 6 operates as a master station (for example, SSID (abbreviation of Service Set Identifier), password, etc.). Therefore, the user can easily establish a Wi-Fi connection between the printer 100 and the AP6.

(Description of each process; FIGS. 3 to 8)
Next, the details of each process executed at T20 to T35 in FIG. 2 will be described with reference to FIGS. 3 to 8. FIG. The processing from T5 to T15 is the same as the processing from T20 to T30 except that the AP6 is used instead of the printer 100, so detailed description thereof will be omitted. 3, 7, and 8 show each case of BS executed between the terminal 10 and the printer 100. FIG. These cases are the processing performed in one embodiment.

(Bootstrapping (BS) of case A; Fig. 3)
First, with reference to FIG. 3, the processing of the BS case A at T20 in FIG. 2 will be described. In the initial state of FIG. 3, the memory 134 of the printer 100 pre-stores the public key PPK1 and the private key psk1 of the printer 100 .

The printer 100 causes the display unit 114 to display the menu screen MS at T105 in response to receiving the power ON operation from the user at T100. The screen MS is, in other words, the default screen of the printer 100, and includes a print button for causing the printer 100 to print, and a setting button for designating various settings of the printer 100 (for example, print settings).

Since the memory 134 has not yet stored the second CO (see T30 in FIG. 2), the printer 100 shifts the operation mode of the NFCI/F 118 from the non-setting mode to the setting mode at T107. Therefore, when the memory 134 does not store the second CO, the operation mode of the NFCI/F 118 is automatically changed from the non-setting mode to the setting mode simply by turning on the power of the printer 100 by the user. The non-setting mode is a state in which the NFCI/F 118 is not energized and an NFC connection cannot be established. The setting mode is a state in which the NFC I/F 118 is energized and an NFC connection can be established.

In T109, the printer 100 (that is, the CPU 132) supplies an application activation instruction for activating the application 40 installed in the terminal 10 to the NFCI/F 118. FIG. As a result, the NFCI/F 118 stores the application activation instruction in the memory 119 .

In response to the terminal 10 being brought closer to the printer 100 by the user at T110, an NFC connection is established between the NFCI/F 18 of the terminal 10 and the NFCI/F 118 of the printer 100 at T112. In this case, the NFC I/F 118 uses the NFC connection to transmit the application activation instruction in the memory 119 to the NFC I/F 18 at T114 in response to receiving the Read command from the NFC I/F 18 using the NFC connection at T113. As a result, the application 40 of the terminal 10 is activated at T118. As described above, the application 40 is activated only by the user bringing the terminal 10 closer to the printer 100, thereby improving convenience for the user.

The printer 100 (that is, the CPU 132) causes the display unit 114 to display the selection screen SLS in T116 in response to obtaining from the NFCI/F 118 the notification indicating that the application activation instruction has been sent. The screen SLS includes a "Connect with AP" button indicating that processing for establishing Wi-Fi connection with AP 6 should be executed, and a "Connect with terminal" button indicating that processing for establishing Wi-Fi connection with terminal 10 should be executed.

In T118, when the application 40 is activated, the terminal 10 executes each of the following processes according to the application 40. FIG. Specifically, the terminal 10 first displays a notification screen. The notification screen includes a message prompting the user to bring the terminal 10 closer to the printer 100 after selecting the process on the printer. The terminal 10 then supplies the NFCI/F 18 with information instructing the disconnection of the NFC connection established at T112. As a result, at T119, the NFC connection is disconnected.

The printer 100 (that is, the CPU 132) supplies a public key transmission instruction for transmitting a public key to the NFCI/F 118 at T122 in response to the user selecting the "connect to AP" button in the screen SLS at T120. The public key transmission instruction includes public key PPK1 of printer 100 stored in memory 134 in advance, a channel list stored in memory 134 in advance, and the MAC address “abc” of Wi-Fi I/F 116 . The channel list is information indicating a plurality of communication channels predetermined in the printer 100 (that is, a plurality of communication channels available to the printer 100). In NFCI/F 118, public key PPK1, channel list, and MAC address “abc” in the public key transmission instruction are stored in memory 119 in response to acquisition of the public key transmission instruction.

Next, at T124, the printer 100 transitions from the disabled state to the enabled state. The disabled state is a state in which the Wi-Fi I/F 116 receives a DPP Authentication Request (hereinafter simply referred to as "AReq") (see T200 in FIG. 4 below) from the terminal 10, but does not transmit a DPP Authentication Response (hereinafter simply referred to as "ARes") (see T210 below). The enabled state is a state in which the Wi-Fi I/F 116 transmits ARes to the terminal 10 in response to receiving AReq from the terminal 10 . That is, the printer 100 enters a state in which Auth (see T25 in FIG. 2) can be executed by shifting from the disabled state to the enabled state. Specifically, in this embodiment, the disabled state is a state in which the Wi-Fi I/F 116 receives a signal from the outside but does not supply the signal to the CPU 132 . The enabled state is a state in which the Wi-Fi I/F 116 receives a signal from the outside, supplies the signal to the CPU 132, and transmits a response to the signal. Since the enabled state is a state in which the CPU 132 processes signals received from the outside, the processing load is higher than that in the disabled state. In a modified example, the disabled state may be a state in which the Wi-Fi I/F 116 is not energized, and the possible state may be a state in which the Wi-Fi I/F 116 is energized. In another modification, the disabled state is a state in which even if the Wi-Fi I/F 116 receives an AReq from the outside, it does not supply the notification indicating that the AReq has been received to the CPU 132, and the enabled state may be a state in which the Wi-Fi I/F 116 supplies the CPU 132 with a notification indicating that the AReq has been received in response to receiving the AReq from the outside.

T130 to T133 are the same as T110 to T113. At T134, the NFC I/F 118 of the printer 100 uses the NFC connection established at T132 to transmit the public key PPK1, the channel list, and the MAC address "abc" in the memory 119 to the NFC I/F 18 of the terminal 10. As a result, the terminal 10 acquires the public key PPK1, the channel list, and the MAC address “abc” of the printer 100 .

At T136, the terminal 10 displays a terminal-side confirmation screen TCS asking the user whether or not to execute connection processing for establishing a Wi-Fi connection between the printer 100 and the AP6. The screen TCS includes a YES button indicating execution of connection processing and a NO button indicating not executing connection processing. At T140, the terminal 10 accepts selection of the YES button in the screen TCS from the user. When the process of T140 ends, the BS process of case A ends.

(Authentication (Auth); Fig. 4)
Next, the Auth processing at T25 in FIG. 2 will be described with reference to FIG. The terminal 10 generates a public key TPK1 and a private key tsk1 of the terminal 10 in T141 in response to the user selecting the YES button in the screen TCS in T140 of FIG. Next, at T142, the terminal 10 uses the generated secret key tsk1 and the public key PPK1 of the printer 100 obtained at T134 in FIG. Then, in T144, the terminal 10 encrypts the random value RV1 using the generated shared key SK1 to generate encrypted data ED1.

At T200, the terminal 10 transmits AReq to the printer 100 via the Wi-Fi I/F 16 with the MAC address "abc" acquired at T134 in FIG. AReq is a signal requesting the printer 100 to perform authentication. Here, the terminal 10 repeats transmitting AReq to the printer 100 by sequentially using the plurality of communication channels in the channel list obtained in T134. The AReq includes the public key TPK1 of the terminal 10 generated at T141, the encrypted data ED1 generated at T144, and the capabilities of the terminal 10.

The capability is information that is specified in advance in a device that supports the DPP method, and includes any one of a value indicating that it can operate only as a DPP method configurator, a value indicating that it can operate only as a DPP method Enrollee, and a value indicating that it can operate as both a Configurator and an Enrollee. Configurator means a device that transmits CO used in NA (T35 in FIG. 2) to Enrollee in Config (T30 in FIG. 2). On the other hand, Enrollee means a device that receives CO used in NA from Configurator in Config. As described above, in this embodiment, the terminal 10 generates the first or second CO and transmits it to the AP 6 or printer 100 . Therefore, the capability of the terminal 10 includes a value indicating that it can operate only as a configurator.

The printer 100 receives AReq from the terminal 10 via the Wi-Fi I/F 116 at T200. As described above, the AReq is transmitted with the MAC address "abc" of the printer 100 as the destination. Therefore, the printer 100 can appropriately receive the AReq from the terminal 10 .

Also, when the printer 100 transitions to the enabled state at T124 in FIG. 3, the printer 100 monitors reception of an AReq using one of the plurality of communication channels in the channel list. As described above, the T200 AReq is transmitted using a plurality of communication channels in the channel list in sequence. Therefore, the printer 100 can appropriately receive the AReq from the terminal 10 .

Next, the printer 100 executes the following processing for authenticating the source of the AReq (that is, the terminal 10). Specifically, first, in T202, the printer 100 generates a shared key SK1 using the public key TPK1 of the terminal 10 in the AReq and the private key psk1 of the printer 100 stored in advance in the memory 134 according to ECDH. Here, the shared key SK1 generated by the terminal 10 at T142 is the same as the shared key SK1 generated by the printer 100 at T204. Therefore, in T204, the printer 100 can appropriately decrypt the encrypted data ED1 in the AReq by using the generated shared key SK1, and as a result, obtain the random value RV1. If the decryption of the encrypted data ED1 succeeds, the printer 100 determines that the source of the AReq is the device with which the NFC connection was established in T132 of FIG. On the other hand, if the decryption of the encrypted data ED1 is not successful, the printer 100 determines that the source of the AReq is not the device with which the NFC connection was established in T132, that is, determines that the authentication has failed, and does not execute the processing after T206.

The printer 100 generates a new public key PPK2 and a new private key psk2 for the printer 100 in T206. Note that, in a modified example, the public key PPK2 and the private key psk2 may be stored in the memory 134 in advance. Next, in T207, the printer 100 uses the public key TPK1 of the terminal 10 in the AReq of T200 and the generated private key psk2 of the printer 100 to generate a shared key SK2 according to ECDH. In T208, the printer 100 encrypts the obtained random value RV1 and the new random value RV2 using the generated shared key SK2 to generate encrypted data ED2.

At T210, the printer 100 transmits ARes to the terminal 10 via the Wi-Fi I/F116. The ARes includes the public key PPK2 of the printer 100 generated at T206, the encrypted data ED2 generated at T208, and the capabilities of the printer 100. The capability includes a value indicating that it can operate as an Enrollee only.

In response to receiving ARes from the printer 100 via the Wi-Fi I/F 16 at T210, the terminal 10 executes the following process for authenticating the source of the ARes (that is, the printer 100). Specifically, first, at T212, the terminal 10 generates a shared key SK2 according to ECDH using the private key tsk1 of the terminal 10 generated at T141 and the public key PPK2 of the printer 100 in the ARes. Here, the shared key SK2 generated by the printer 100 at T207 is the same as the shared key SK2 generated by the terminal 10 at T212. Therefore, at T214, the terminal 10 can appropriately decrypt the encrypted data ED2 in the ARes using the generated shared key SK2, and as a result, can obtain the random values RV1 and RV2. If the decryption of the encrypted data ED2 succeeds, the terminal 10 determines that the source of the ARes is the device with which the NFC connection was established in T132 of FIG. On the other hand, if the decryption of the encrypted data ED2 is not successful, the terminal 10 determines that the source of the ARes is not the device with which the NFC connection was established at T132, that is, determines that the authentication has failed, and does not execute the processing from T220.

At T220, the terminal 10 transmits Confirm to the printer 100 via the Wi-Fi I/F 16. FIG. Confirm includes information indicating that the terminal 10 operates as a configurator and the printer 100 operates as an enrollee. As a result, in T222, the terminal 10 decides to operate as a configurator, and in T224, the printer 100 decides to operate as an enrollee. When the process of T224 ends, the process of FIG. 4 ends.

(Configuration (Config); Fig. 5)
Next, the Config processing at T30 in FIG. 2 will be described with reference to FIG. At T300, the printer 100 transmits a DPP Configuration Request (hereinafter simply referred to as “CReq”) to the terminal 10 via the Wi-Fi I/F 116. FIG. The CReq is a signal requesting transmission of CO (that is, information for establishing a Wi-Fi connection between the printer 100 and the AP 6).

The terminal 10 receives CReq from the printer 100 via the Wi-Fi I/F 16 at T300. In this case, the terminal 10 acquires the group ID “Group1”, the public key TPK2, and the secret key tsk2 from the memory (not shown) of the terminal 10 in T301. As described above, the terminal 10 has executed the Config of T15 in FIG. 2 with the AP 6, and at this time, generates the group ID "Group1", the public key TPK2, and the secret key tsk2, and stores them in the memory. The group ID “Group1” is information identifying a wireless network formed by establishing a Wi-Fi connection between the printer 100 and the AP6. Note that in a modification, a character string specified by the user may be used as the group ID. That is, at T301, the terminal 10 acquires each piece of information stored at T15 in FIG. Next, the terminal 10 generates a second CO (see T30 in FIG. 2) in T302. Specifically, the terminal 10 executes the following processes.

Terminal 10 generates hash value HV by hashing public key TPK2 of terminal 10 . Also, the terminal 10 generates a specific value by hashing the combination of the hash value HV, the group ID “Group1”, and the public key PPK2 of the printer 100 in ARes of T210 in FIG. Then, the terminal 10 generates the electronic signature DS1 by encrypting the generated specific value using the secret key tsk2 of the terminal 10 according to ECDSA (abbreviation of Elliptic Curve Digital Signature Algorithm). As a result, the terminal 10 can generate a signed-connector for the printer (hereinbelow, the signed-connector is simply referred to as "SCont") including the hash value HV, the group ID "Group1", the public key PPK2 of the printer 100, and the electronic signature DS1. Then, the terminal 10 generates a second CO including the printer SCont and the public key TPK2 of the terminal 10 .

At T310, the terminal 10 transmits to the printer 100 via the Wi-Fi I/F 16 a DPP Configuration Response (hereinafter simply referred to as "CRes") including the second CO.

The printer 100 receives CRes from the terminal 10 via the Wi-Fi I/F 116 at T310. In this case, the printer 100 stores the second CO in the CRes in the memory 134 at T312. When the process of T312 ends, the process of FIG. 5 ends.

(Network Access (NA); Fig. 6)
Next, with reference to FIG. 6, the processing of NA in T35 of FIG. 2 executed between the printer 100 and AP6 will be described. As described above, the processing of T5 to T15 in FIG. 2 has already been executed between the terminal 10 and AP6, similar to T20 to T30 in FIG. However, AP6 does not execute the processing of T105 to T134 in FIG. AP6 pre-stores AP6's public key APK1 and secret key ask1. A QR code obtained by encoding AP6's public key APK1, AP6's channel list, and AP6's MAC address is attached to the housing of AP6. By photographing the QR code by the terminal 10, each process similar to each process after T136 is executed between the terminal 10 and the AP6. As a result, AP6 stores AP6's public key APK2 and secret key ask2 (see T206 in FIG. 4), and further stores the first CO received from terminal 10 (see T312 in FIG. 5). The first CO includes SCont for AP and public key TPK2 of terminal 10 . The public key TPK2 is the same as the public key TPK2 included in the second CO. Also, the AP SCont includes a hash value HV, a group ID "Group1", a public key APK2 of AP6, and an electronic signature DS2. The hash value HV and the group ID "Group1" are the same as the hash value HV and the group ID "Group1" included in the second CO, respectively. The electronic signature DS2 is information obtained by hashing a combination of the hash value HV, the group ID "Group1", and the public key APK2 and encrypting the specific value with the private key tsk2 of the terminal 10, and is a different value from the electronic signature DS1 included in the second CO.

At T400, the printer 100 transmits a DPP Peer Discovery Request (hereinafter simply referred to as “DReq”) including the printer SCont to the AP 6 via the Wi-Fi I/F 116 . The DReq is a signal requesting the AP 6 to perform authentication and transmit SCont for AP.

At T400, upon receiving the DReq from the printer 100, the AP 6 performs processing to authenticate the source of the DReq (ie, the printer 100) and each piece of information in the DReq (ie, the hash value HV, "Group1", and public key PPK2). Specifically, in T402, the AP 6 first executes a first AP determination process regarding whether or not the hash value HV and the group ID "Group1" in the received printer SCont match the hash value HV and the group ID "Group1" in the AP SCont included in the stored first CO. In the case of FIG. 6, the AP 6 determines that the IDs match in the first AP determination process, and thus determines that the authentication of the source of the DReq (that is, the printer 100) has succeeded. If the hash value HV in the received printer SCont and the hash value HV in the AP SCont included in the stored first CO match, it means that the printer SCont and the AP SCont were generated by the same device (that is, the terminal 10). Therefore, the AP 6 also determines that the authentication of the generation source (that is, the terminal 10) of the received SCont for printer has succeeded. Furthermore, AP6 decrypts the electronic signature DS1 in the received printer SCont using the public key TPK2 of the terminal 10 included in the stored first CO. In the case of FIG. 6, the decryption of the electronic signature DS1 is successful, so the AP 6 performs a second AP determination process regarding whether or not the specific value obtained by decrypting the electronic signature DS1 matches the value obtained by hashing the information (that is, the hash value HV, "Group1", and the public key PPK2) in the received printer SCont. In the case of FIG. 6, the AP 6 determines "match" in the second AP determination process, so it determines that the authentication of each information in the DReq has succeeded, and executes the processes from T404. A determination of "matching" in the second AP determination processing means that each piece of information (i.e., hash value HV, "Group1", and public key PPK2) in the received printer SCont has not been tampered with by a third party after the second CO was stored in the printer 100. On the other hand, if the first AP determination process determines that "not match", if the decryption of the electronic signature DS1 fails, or if the second AP determination process determines "does not match", the AP 6 determines that the authentication has failed and does not execute the processes after T404.

Next, in T404, AP6 generates a connection key (that is, a shared key) CK using the obtained public key PPK2 of the printer 100 and the stored secret key ask2 of AP6 according to ECDH.

At T410, the AP 6 transmits to the printer 100 a DPP Peer Discovery Response (hereinafter simply referred to as "DRes") including the SCont for AP.

At T410, in response to receiving DRes from AP6 via the Wi-Fi I/F 116, the printer 100 performs processing for authenticating the source of the DRes (that is, AP6) and each piece of information within the DRes (that is, the hash value HV, “Group1”, and public key APK2). Specifically, at T412, the printer 100 first executes a first PR determination process regarding whether or not the hash value HV and group ID “Group1” in the received AP SCont match the hash value HV and group ID “Group1” in the printer SCont included in the stored second CO. In the case of FIG. 6, the printer 100 determines that the PRes match in the first PR determination process, and thus determines that the authentication of the DRes sender (that is, AP6) has succeeded. If the hash value HV in the received AP SCont matches the hash value HV in the printer SCont included in the stored second CO, it means that the printer SCont and the AP SCont are generated by the same device (that is, the terminal 10). Therefore, the printer 100 also determines that the authentication of the source of the received SCont for AP (that is, the terminal 10) has succeeded. Further, the printer 100 uses the public key TPK2 of the terminal 10 included in the stored second CO to decrypt the electronic signature DS2 in the received SCont for AP. In the case of FIG. 6, the electronic signature DS2 is successfully decrypted, so the printer 100 executes the second PR determination process regarding whether or not the specific value obtained by decrypting the electronic signature DS2 matches the value obtained by hashing the information in the received SCont for AP (that is, the hash value HV, "Group1", and public key APK2). In the case of FIG. 6, the printer 100 determines “matches” in the second PR determination process, and therefore determines that the authentication of each information in DRes has succeeded, and executes the processes from T414. Determining “match” in the second PR determination process means that each piece of information in the AP SCont (that is, hash value HV, “Group1”, and public key APK2) has not been tampered with by a third party after the first CO was stored in AP6. On the other hand, if the first PR determination process determines that they do not match, if the decryption of the electronic signature DS2 fails, or if the second PR determination process determines that they do not match, the printer 100 determines that the authentication has failed, and does not execute the processes after T414.

At T414, the printer 100 generates a connection key CK according to the ECDH using the stored private key psk2 of the printer 100 and the public key APK2 of AP6 in the received SCont for AP. Here, the connection key CK generated by the AP 6 at T404 is the same as the connection key CK generated by the printer 100 at T414. As a result, the connection key CK for establishing Wi-Fi connection is shared between the printer 100 and AP6. When T414 ends, the processing in FIG. 6 ends.

As described above, after the connection key CK is shared between the printer 100 and AP6, the printer 100 and AP6 execute 4way-handshake communication using the connection key CK at T40 in FIG. As a result, a Wi-Fi connection is established between the printer 100 and the AP6. As described above, printer 100 receives AReq of T200 in FIG. That is, the printer 100 receives AReq of T200 from the terminal 10 using a communication channel that can be used by both the printer 100 and the terminal 10 . On the other hand, at T40 in FIG. 2, the printer 100 establishes a Wi-Fi connection with AP6 using a communication channel that can be used by both the printer 100 and AP6. Here, the communication channel that can be used by the terminal 10 and the communication channel that can be used by the AP 6 may differ. In this embodiment, the communication channel for the printer 100 to receive the AReq from the terminal 10 at T200 in FIG. 4 is different from the communication channel for the printer 100 to establish the Wi-Fi connection with the AP 6 at T40 in FIG. However, in a modification, the former communication channel and the latter communication channel may be the same.

(Bootstrapping (BS) in case B; FIG. 7)
Next, with reference to FIG. 7, the processing of the BS case B at T20 in FIG. 2 will be described. Case B is the state before T20 to T40 in FIG. 2 are executed, that is, the state in which the memory 134 of the printer 100 has not yet stored the second CO. Case B assumes a situation in which the user cannot bring the terminal 10 closer to the printer 100 again after the application 40 is activated on the terminal 10 (T118 in FIG. 3).

T500 to T524 are the same as T100 to T124 in FIG. In this case, the terminal 10 cannot be brought closer to the printer 100 again by the user, so the processing after T130 is not executed. That is, since the public key PPK1, the channel list, and the MAC address “abc” of the printer 100 are not acquired by the terminal 10, the AReq is not transmitted from the terminal 10 to the printer 100. FIG. In this case, the printer 100 determines at T526 that no AReq has been received within a predetermined time after transitioning to the enabled state at T524, and transitions from the enabled state to the disabled state at T528. As a result, it is possible to prevent the printer 100 from being in the enabled state for a long period of time. Therefore, the processing load of the printer 100 can be reduced. At T530, the printer 100 causes the display unit 114 to display an error screen indicating that the AReq has not been received from the terminal 10. FIG. When the process of T530 ends, the process of FIG. 7 ends and the communication according to the DPP method is stopped.

(Bootstrapping (BS) of case C; FIG. 8)
Next, with reference to FIG. 8, the processing of another case C of the BS will be described. Case C is the state after T20 to T40 in FIG. 2 have been executed, that is, the state in which the memory 134 of the printer 100 has already stored the second CO.

T600 and T603 are the same as T100 and T105 in FIG. In this case, since the memory 134 of the printer 100 stores the second CO, the printer 100 does not change the operation mode of the NFCI/F 118 from the non-setting mode to the setting mode. In situations where the printer 100 stores the second CO, the printer 100 can utilize the second CO to establish a Wi-Fi connection with the AP6. Therefore, the possibility of BS being executed in the printer 100 is low. In such a situation, the printer 100 does not shift the operation mode of the NFCI/F 118 to the setting mode, that is, does not energize the NFCI/F 118, so power consumption can be reduced.

The user may wish to establish a Wi-Fi connection between the printer 100 and an AP different from AP6, for example, while the printer 100 stores the second CO. In this case, the user selects the setting button in the menu screen MS in T604. In this case, the printer 100 causes the display unit 114 to display the setting screen SS in T605. The screen SS includes a print setting button for changing the print settings of the printer 100 and a mode transition button for changing the operation mode of the NFCI/F 118 . Then, in T606, the user selects the mode transition button within the screen SS. In this case, the printer 100 shifts the operation mode of the NFCI/F 118 from the non-setting mode to the setting mode in T607. As a result, when the terminal 10 is brought closer to the printer 100 by the user, the processes after T110 in FIG. 3 are executed. T609 is the same as T109 in FIG.

Note that the printer 100 can also establish a Wi-Fi connection with the AP 6 according to the normal Wi-Fi method (that is, the method using the SSID and password) without using the DPP method. In this case, the memory 134 of the printer 100 stores wireless setting information (ie SSID and password) for establishing Wi-Fi connection with the AP6. Even if the power of the printer 100 is turned on in such a state, the printer 100 does not change the operation mode of the NFCI/F 118 from the non-setting mode to the setting mode, as in case C of FIG. This is because the printer 100 can establish a Wi-Fi connection with the AP 6 using the wireless setting information. Since the NFCI/F 118 is not energized even in such a situation, power consumption can be reduced.

(Processing for connection with terminal 10; FIG. 9)
Next, referring to FIG. 9, processing for establishing a Wi-Fi connection between the terminal 10 and the printer 100 will be described. T700 to T719 are the same as T100 to T119 in FIG. At T720, the printer 100 shifts to the G/O state in response to the user selecting the "connect to terminal" button in the selection screen SLS at T720, and generates the SSID "xxx" and password used in the wireless network in which the printer 100 operates as G/O. Then, in T722, the printer 100 supplies an SSID transmission instruction to the NFCI/F 118 to instruct transmission of the SSID. The SSID transmission instruction includes the generated SSID "xxx". As a result, the SSID “xxx” is stored in the memory 119 in the NFCI/F 118 .

T730 to T733 are the same as T130 to T133 in FIG. At T734, the NFC I/F 118 of the printer 100 transmits the SSID "xxx" in the memory 119 to the NFC I/F 18 of the terminal 10 using the NFC connection established at T732. As a result, the terminal 10 acquires the SSID “xxx”.

At T740, search processing is executed for the terminal 10 to search for a device to be connected (that is, the printer 100). Specifically, the following processes are executed. First, the printer 100 receives a Probe Request (hereinafter simply referred to as “PReq”) broadcast from the terminal 10 via the Wi-Fi I/F 116 and transmits a Probe Response (hereinafter simply referred to as “PRes”) to the terminal 10 . The PRes includes the SSID "xxx".

When the terminal 10 transmits PReq by broadcast, it receives PRes from each of one or more devices including the printer 100 . In this case, the terminal 10 identifies the printer 100 to be connected by identifying the PRes including the SSID "xxx" acquired in T734 from among one or more PRes. Then, the terminal 10 transmits to the printer 100 a PReq including the SSID "xxx" of the specified printer 100 via the Wi-Fi I/F 16 (that is, by unicast).

Printer 100 transmits PRes to terminal 10 in response to receiving PReq including SSID “xxx” from terminal 10 via Wi-Fi I/F 116 .

In T750, the printer 100 executes various communications (Association, WPS Negotiation, 4way-handshake) with the terminal 10. FIG. The printer 100 transmits wireless setting information including the generated SSID “xxx” and the generated password to the terminal 10 in WPS Negotiation. Then, the printer 100 establishes a Wi-Fi connection with the terminal 10 by executing 4way-handshake communication with the terminal 10 using the SSID “xxx” and password. As a result, the printer can receive print data from the terminal 10 via the Wi-Fi I/F 116 at T762 in response to the user executing a print operation on the terminal 10 to cause the printer 100 to print at T760. In T764, the printer 100 causes the print execution unit 120 to print according to the received print data. When the process of T764 ends, the process of FIG. 9 ends.

(Effect of this embodiment)
In this embodiment, when the NFC connection with the terminal 10 is established (T112 in FIG. 3), the printer 100 displays the selection screen SLS (T116). When the user selects the “connect to AP” button in the screen SLS (T120), a public key transmission instruction is supplied to the NFCI/F 118 (T122). As a result, the NFCI/F 118 transmits the public key PPK1 to the terminal 10 (T134). As a result, the printer 100 can receive AReq from the terminal 10 (T200 in FIG. 4), send ARes to the terminal 10 (T210), receive the second CO from the terminal 10 (T310 in FIG. 5), and establish a Wi-Fi connection with the AP 6 using the second CO (T35, T40 in FIG. 2). On the other hand, if the user does not select the “connect to AP” button in the screen SLS (T720 in FIG. 9), the public key transmission instruction is not supplied to the NFCI/F 118. As a result, public key TPK1 is not transmitted to terminal 10 via NFC I/F 118, so printer 100 does not receive AReq from terminal 10 and does not establish Wi-Fi connection with AP6. Thus, it is possible to switch whether to establish a Wi-Fi connection between the printer 100 and the AP6.

Also, in this embodiment, after the NFC connection with the terminal 10 is established (T112 in FIG. 3), the printer 100 transitions from the disabled state to the enabled state (T124). As a result, the printer 100 can receive AReq from the terminal 10 (T200 in FIG. 4), send ARes to the terminal 10 (T210), receive the second CO from the terminal 10 (T310 in FIG. 5), and establish a Wi-Fi connection with the AP 6 using the second CO (T35, T40 in FIG. 2). The printer 100 does not transition to the enabled state, which has a higher processing load than the disabled state, before the NFC connection with the terminal 10 is established. For this reason, the processing load on the printer 100 can be reduced in the technique of establishing a Wi-Fi connection between the printer 100 and the AP 6 using the terminal 10 .

(correspondence relationship)
The printer 100, the terminal 10, and the AP 6 are examples of the "communication device,""first external device," and "second external device," respectively. The NFCI/F 118, the Wi-Fi I/F 116, and the CPU 132 are examples of the "first wireless interface,""second wireless interface," and "controller," respectively. The NFC connection at T112 in FIG. 3 (or T512 in FIG. 7, T712 in FIG. 9) and the Wi-Fi connection at T40 in FIG. 2 are examples of the "first wireless connection" and the "second wireless connection", respectively. The selection screen SLS, the public key PPK1, and the public key transmission instruction are examples of the "instruction screen," the "public key," and the "first instruction information," respectively. The processing in FIG. 2 is an example of the “target processing”. AReq, ARes, and second CO are examples of "authentication request,""authenticationresponse," and "connection information," respectively. The Wi-Fi connection established at T40 in FIG. 2 is an example of a "wireless connection."

The "connect to AP" button, "connect to terminal" button in the setting screen SS, and the Wi-Fi connection of T750 in FIG. 9 are examples of "first selection area", "second selection area", and "third wireless connection", respectively. The memory 119 of the NFC I/F 118, the NFC connection of T132 in FIG. 3, the NFC connection of T732, the SSID "xxx", and the SSID transmission instruction are examples of "interface memory," "fourth wireless connection," "fifth wireless connection," "establishment information," and "second instruction information," respectively. The channel list, the communication channel used at T200 in FIG. 4, and the communication channel used at T40 in FIG. 2 are examples of "communication channel information," "first communication channel," and "second communication channel," respectively. An example of the "predetermined condition" is accepting a user's power ON operation while the second CO is not stored in the memory 134, and accepting a user's selection of the mode shift button while the second CO is stored in the memory 134. The non-setting mode and setting mode are examples of the "first mode" and the "second mode", respectively. The memory 134 is an example of a "controller memory." The selection operation of the mode transition button in T606 of FIG. 8 is an example of the "specific operation". The application 40 and the application activation instruction are examples of the "application program" and the "activation information", respectively. The SCont for AP and the hash value HV in the second CO are examples of "receiving information" and "authentication information", respectively.

3 (or T516 in FIG. 7, T716 in FIG. 9), T122 (or T522), T200 in FIG. 4, T210, T310 in FIG. 5, and T35 and T40 in FIG. It is an example of processing executed by the first establishing unit.

The processing of T124 in FIG. 3 (or T524 in FIG. 7), the processing of T200 in FIG. 4, the processing of T210, the processing of T310 in FIG. 5, and the processing of T35 and T40 in FIG.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. Modifications of the above embodiment are listed below.

(Modification 1) At T122 in FIG. 3, the printer 100 may supply to the NFCI/F 118 a public key transmission instruction that does not include the channel list and the MAC address "abc" but includes the public key PPK1. In this case, the printer 100, in response to transitioning from the disabled state to the enabled state at T124, monitors for reception of an AReq in which one radio channel among all the radio channels available to the printer 100 is used. In addition, at T200 in FIG. 4, the terminal 10 sequentially uses all radio channels available to the terminal 10 to sequentially transmit AReq by broadcasting. That is, the "first wireless interface" should transmit at least the public key to the first external device.

(Modification 2) The processing (eg, T142 and T202 in FIG. 4) for generating a shared key (eg, SK1) is not limited to the above-described processing according to ECDH, but may be other processing according to ECDH. Further, the processing for generating a shared key is not limited to processing according to ECDH, and processing according to other schemes (for example, DH (abbreviation of Diffie-Hellman key exchange), etc.) may be executed. Also, in the above embodiment, the electronic signatures DS1 and DS2 are generated according to ECDSA, but may be generated according to other methods (for example, DSA (abbreviation of Digital Signature Algorithm), RAS (abbreviation of Rivest-Shamir-Adleman cryptosystem), etc.).

(Modification 3) The processing of T721 in FIG. 9 may be omitted. In this case, the printer 100 supplies a MAC address transmission instruction including the MAC address “abc” to the NFCI/F 118 instead of executing the process of T722. As a result, the MAC address "abc" is transmitted from the NFCI/F 118 of the printer 100 to the NFCI/F 18 of the terminal 10, and the terminal 10 acquires the MAC address "abc". As a result, the terminal 10 can specify the printer 100 to be connected by using the received MAC address "abc" in the search process. Thereafter, G/O Negotiation is executed between the terminal 10 and the printer 100, and it is determined that one of the terminal 10 and the printer 100 will operate as a G/O and the other will operate as a client. 9 is executed between the terminal 10 and the printer 100 to establish a Wi-Fi connection between the terminal 10 and the printer 100. FIG. In this modification, the MAC address transmission instruction and the MAC address "abc" are examples of "second instruction information" and "establishment information", respectively.

(Modification 4) The Wi-Fi I/F 116 of the printer 100 may not support the WFD system. In this case, for example, at T116 in FIG. 3, the printer 100 may cause the display unit 114 to display a printer-side confirmation screen PCS for confirming to the user that connection processing for establishing a Wi-Fi connection between the printer 100 and the AP 6 will be executed instead of the selection screen SLS. The screen PCS includes a YES button indicating that connection processing is to be executed. The printer 100 executes the processes from T122 onward in response to selection of the YES button in the screen PCS. If the YES button in the screen PCS is not selected within the predetermined time, the printer 100 causes the display unit 114 to display the menu screen MS again without executing the processes after T122. In this modified example, the printer-side confirmation screen PCS is an example of the "instruction screen." Also, in this modified example, the “second selection area”, the “second establishment unit”, and the “second supply unit” can be omitted. Note that in another modification, the screen PCS may further include a NO button indicating that the connection process is not to be executed. In this case, when the user selects the NO button in the screen PCS, the printer 100 causes the display unit 114 to display the screen MS again without executing the processes after T122. In this modified example, selection of the NO button in the screen PCS is an example of "when it is not instructed to execute the target process".

(Variation 5) The public key PPK1, the channel list, and the MAC address “abc” of the printer 100 may be stored in the memory 119 of the NFCI/F 118 in advance. Also, the printer 100 does not have to execute the process of T109 in FIG. In this case, in the terminal 10, the user performs the activation operation of the application 40, and after the application 40 is activated, the processes of T110 and T112 are performed. Note that at this point, even if the NFCI/F 118 receives a Read command from the terminal 10, it is in a state of not transmitting a response to the Read command. Therefore, NFCI/F 118 does not transmit public key PPK1, channel list and MAC address “abc” of printer 100 in memory 119 . Also, the NFC I/F 118 of the printer 100 supplies the CPU 132 of the printer 100 with a notification indicating that the NFC connection has been established in response to the establishment of the NFC connection with the NFC I/F 18 of the terminal 10 . Printer 100 (that is, CPU 132 ) causes display unit 114 to display selection screen SLS in response to obtaining the notification from NFCI/F 118 . Then, the printer 100 supplies a public key transmission instruction to the NFCI/F 118 when the user selects the “connect to AP” button in the screen SLS. Note that the public key transmission instruction does not include the public key PPK1 of the printer 100 and the like. When the NFCI/F 118 of the printer 100 acquires the public key transmission instruction and receives the Read command from the terminal 10, the NFCI/F 118 shifts to a state of transmitting a response to the Read command. Therefore, the NFCI/F 118 uses the established NFC connection to transmit the public key PPK1, the channel list and the MAC address “abc” of the printer 100 in the memory 119 to the NFCI/F 18 of the terminal 10 . In this modification, the NFC connection of T112 is an example of the "first wireless connection". Also, in this modified example, the "activation information" can be omitted. Furthermore, in this modification, the "first instruction information" does not have to include the public key.

(Modification 6) Instead of the NFCI/F 118, the printer 100 may be provided with a different wireless interface conforming to a wireless system different from the NFC system (for example, the Bluetooth (registered trademark) system, the TransferJet system). Note that the above Bluetooth system includes Bluetooth system version 4.0 or higher (so-called Blue Tooth Low Energy). In this case, the printer 100 transmits the public key PPK1, the channel list, and the MAC address "abc" to the terminal 10 via the wireless interface at T134 in FIG. 3, for example. In this modified example, the wireless interface is an example of the "first wireless interface".

(Modification 7) The NFCI/F 118 of the printer 100 may not include the memory 119 . In this case, the NFCI/F 118 supplies the notification indicating that the NFC connection has been established to the CPU 132 in response to the establishment of the NFC connection with the NFCI/F 18 at T132 in FIG. Printer 100 supplies a public key transmission instruction to NFCI/F 118 in response to obtaining the notification. As a result, the NFCI/F 118 of the printer 100 uses the established NFC connection to transmit the public key PPK1 and the like in the public key transmission instruction to the NFCI/F 18 of the terminal 10 . In this modified example, the "interface memory" can be omitted. Note that the above NFC communication may be communication according to the P2P (abbreviation of Peer to Peer) mode of the NFC standard.

(Modification 8) At T35 in FIG. 2, NA processing may be executed between the terminal 10 and the printer 100 to establish a Wi-Fi connection between the terminal 10 and the printer 100. FIG. That is, the "second external device" may be the same device as the "first external device".

(Modification 9) The printer 100 may supply the application activation instruction and the public key transmission instruction to the NFC I/F 118 in T109 of FIG. In this case, the printer 100 transitions from the disabled state to the enabled state in response to obtaining a notification from the NFC I/F 118 indicating that the NFC connection has been established at T112. Also, at T114, the NFCI/F 118 uses the established NFC connection to transmit the application activation instruction, public key PPK1, channel list, and MAC address “abc” to the NFCI/F 18 of the terminal 10 . After that, the processing after T136 is executed. Also, in another modification, the printer 100 may transition from the disabled state to the enabled state after the process of T134. In this case, the printer 100 transitions from the disabled state to the enabled state in response to obtaining a notification from the NFCI/F 118 indicating that the public key PPK1 and the like have been sent. That is, the printer 100 may shift to the enabled state after the NFC connection is established at T112.

(Modification 10) At T721 in FIG. 9, the printer 100 may operate as a so-called Soft AP instead of operating as a WFD G/O. In this case, the printer 100 generates an SSID and password to be used in the wireless network in which the printer 100 operates as Soft AP, and supplies the SSID transmission instruction including the SSID and password to the NFCI/F 118 . As a result, at T734, the NFCI/F 118 uses the established NFC connection to transmit the SSID and password to the NFCI/F 18 . In this modified example, the above SSID and password are an example of "establishment information".

(Modification 11) The NFCI/F 118 of the printer 100 may be configured to always operate in the setting mode. In this modified example, the "mode transition section" can be omitted.

(Modification 12) In the above embodiment, the terminal 10 is used to establish a Wi-Fi connection between the printer 100 and the AP6. Alternatively, for example, using the terminal 10, a Wi-Fi connection may be established between the printer 100 operating as the G/O (that is, the device operating as the master station) and another device (that is, the device operating as the slave station). That is, the "second external device" does not have to be the "master station device".

(Modification 13) The "communication device" may not be a printer, but may be another device such as a scanner, a multi-function device, a mobile terminal, a PC, or a server.

(Modification 14) In each of the above embodiments, each process in FIGS. 2 to 9 is implemented by software (that is, the program 136), but at least one of these processes may be implemented by hardware such as a logic circuit.

In addition, the technical elements described in this specification or in the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques exemplified in this specification or drawings achieve multiple purposes at the same time, and achieving one of them has technical utility in itself.
The following items are claimed elements as filed.
(Item 1)
A communication device,
a display unit;
a first wireless interface;
a second wireless interface different from the first wireless interface;
a control unit;
The control unit
a display control unit that causes the display unit to display an instruction screen for instructing execution of target processing including transmission of a public key when a first wireless connection is established between the communication device and the first external device through the first wireless interface;
a first supply unit that supplies first instruction information for instructing transmission of the public key to the first wireless interface when an instruction to execute the target process is given in a state where the instruction screen is displayed, wherein the first instruction information is not supplied to the first wireless interface when an instruction to execute the target process is not given in a situation where the instruction screen is displayed;
with
the first wireless interface, after acquiring the first instruction information from the control unit, transmits the public key to the first external device;
The control unit further
an authentication request receiving unit that receives an authentication request using the public key from the first external device via the second wireless interface after the public key is transmitted to the first external device;
an authentication response transmission unit configured to transmit an authentication response, which is a response to the authentication request, to the first external device via the second wireless interface when the authentication request is received from the first external device;
a connection information receiving unit that receives connection information from the first external device via the second wireless interface after the authentication response is transmitted to the first external device, the connection information receiving unit being information for establishing a second wireless connection between the communication device and a second external device via the second wireless interface;
a first establishing unit that establishes the second wireless connection between the communication device and the second external device via the second wireless interface using the connection information when the connection information is received from the first external device;
A communication device comprising:
(Item 2)
the second external device is a device different from the first external device,
the instruction screen includes a first selection area corresponding to the target process and a second selection area corresponding to a process different from the target process;
The first supply unit supplies the first instruction information to the first wireless interface when the first selection area is selected in a situation where the instruction screen is displayed;
The control unit further
The communication device according to item 1, further comprising: a second establishing unit that establishes a third wireless connection between the communication device and the first external device via the second wireless interface when the second selection area is selected in a situation where the instruction screen is displayed.
(Item 3)
the first wireless interface comprises an interface memory;
the first instruction information includes the public key;
The first radio interface is
storing the public key included in the first instruction information in the interface memory in response to obtaining the first instruction information from the control unit;
when a fourth wireless connection is established between the communication device and the first external device via the first wireless interface after the first wireless connection is disconnected and the public key is stored in the interface memory, transmitting the public key to the first external device using the fourth wireless connection;
The control unit further
A second supply unit that supplies second instruction information including establishment information for establishing the third wireless connection to the first wireless interface when the second selection area is selected in a situation where the instruction screen is displayed,
The first radio interface is
storing the establishment information included in the second instruction information in the interface memory in response to acquiring the second instruction information from the control unit;
when a fifth wireless connection is established between the communication device and the first external device via the first wireless interface after the first wireless connection is disconnected and the establishment information is stored in the interface memory, using the fifth wireless connection to transmit the establishment information to the first external device via the first wireless interface;
The communication device according to item 2, wherein, after the establishment information is transmitted to the first external device, the second establishment unit establishes the third wireless connection between the communication device and the first external device via the second wireless interface by using the establishment information.
(Item 4)
The control unit further
a state transition unit for transitioning an operation state of the communication device from an impossible state to an enabled state after the first wireless connection is established, wherein the impossible state is a state in which the authentication response is not transmitted even if the authentication request is received from the first external device, and the enabled state is a state in which the authentication response is transmitted to the first external device in response to receiving the authentication request from the first external device;
4. The communication device according to any one of items 1 to 3, wherein the authentication response transmission unit transmits the authentication response to the first external device via the second wireless interface when the authentication request is received from the first external device after the operation state of the communication device is shifted to the enabled state.
(Item 5)
A communication device,
a first wireless interface;
a second wireless interface different from the first wireless interface;
a control unit;
The control unit
A state transition unit that shifts an operation state of the communication device from a disabled state to a enabled state after a first wireless connection is established between the communication device and a first external device through the first wireless interface, wherein the disabled state is a state in which even if an authentication request using a public key is received from the first external device, an authentication response that is a response to the authentication request is not transmitted, and the enabled state is a state in which the authentication response is sent to the first external device in response to receiving the authentication request from the first external device. the state transition unit, which is a state to be transmitted to an external device of
with
the first wireless interface transmits the public key to the first external device after the first wireless connection is established;
The control unit further
an authentication request receiving unit configured to receive the authentication request from the first external device via the second wireless interface after the public key has been transmitted to the first external device;
an authentication response transmitting unit configured to transmit the authentication response to the first external device via the second wireless interface when the authentication request is received from the first external device after the operation state of the communication device has been shifted to the enabled state;
a connection information receiving unit that receives connection information from the first external device via the second wireless interface after the authentication response is transmitted to the first external device, the connection information receiving unit being information for establishing a second wireless connection between the communication device and a second external device via the second wireless interface;
a first establishing unit that establishes the second wireless connection between the communication device and the second external device via the second wireless interface using the connection information when the connection information is received from the first external device;
A communication device comprising:
(Item 6)
the first wireless interface transmits the public key and communication channel information indicating a first communication channel predetermined in the communication device to the first external device;
The enabled state is a state of monitoring reception of the authentication request using the first communication channel, and transmitting the authentication response to the first external device in response to receiving the authentication request from the first external device,
The communication device according to item 4 or 5, wherein the authentication response transmission unit transmits the authentication response to the first external device via the second wireless interface when the authentication request using the first communication channel is received from the first external device after the operating state of the communication device is shifted to the enabled state.
(Item 7)
The communication device according to item 6, wherein the first establishing unit uses a second communication channel different from the first communication channel to establish the second wireless connection between the communication device and the second external device via the second wireless interface.
(Item 8)
8. The communication device according to any one of items 1 to 7, wherein the first wireless interface uses the fourth wireless connection to transmit the public key to the first external device when the first wireless connection is disconnected and a fourth wireless connection is established between the communication device and the first external device via the first wireless interface.
(Item 9)
the first wireless interface comprises an interface memory;
first instruction information for instructing transmission of the public key includes the public key;
The first radio interface is
storing the public key included in the first instruction information in the interface memory in response to obtaining the first instruction information from the control unit;
The communication device according to item 8, wherein when the fourth wireless connection is established after the first wireless connection is disconnected and the public key is stored in the interface memory, the public key is transmitted to the first external device using the fourth wireless connection.
(Item 10)
The control unit further
10. The communication device according to any one of items 1 to 9, further comprising: a mode transition unit that shifts an operation mode of the first wireless interface from a first mode to a second mode when a predetermined condition is satisfied, wherein the first mode is a mode in which wireless connection cannot be established via the first wireless interface, and the second mode is a mode in which wireless connection can be established via the first wireless interface.
(Item 11)
The control unit further
a controller memory;
a storage controller that stores the connection information in the controller memory when the connection information is received from the first external device;
when the power of the communication device is turned on in a situation where the connection information is not stored in the control unit memory, the predetermined condition is satisfied;
11. The communication device according to item 10, wherein the predetermined condition is not satisfied when the power of the communication device is turned on while the connection information is stored in the control unit memory.
(Item 12)
The communication device further
Equipped with an operation unit,
12. The communication device according to item 11, wherein the predetermined condition is satisfied when a specific operation via the operation unit is accepted in a situation where the connection information is stored in the control unit memory.
(Item 13)
When the first wireless connection is established, the first wireless interface uses the first wireless connection to transmit activation information for activating an application program installed in the first external device to the first external device,
13. The communication device according to any one of items 1 to 12, wherein the authentication request receiving unit receives the authentication request transmitted from the first external device according to the application program.
(Item 14)
14. The communication device according to any one of items 1 to 13, wherein the first wireless interface is an NFC (Near Field Communication) type tag interface.
(Item 15)
The second external device is a device different from the first external device and is a master station device that should operate as a master station of a wireless network,
15. The communication device according to any one of items 1 to 14, wherein the first establishing unit establishes the second wireless connection between the communication device and the second external device via the second wireless interface, and allows the communication device to participate in the wireless network as a slave station.
(Item 16)
16. The communication device according to any one of items 1 to 15, wherein the connection information includes authentication information for authenticating received information received from the second external device.
(Item 17)
The control unit further
17. The communication device according to any one of items 1 to 16, comprising an operation control unit that operates the communication device as an Enrollee conforming to the Wi-Fi standard after the authentication response is transmitted to the first external device, wherein the first external device operates as a configurator conforming to the Wi-Fi standard.
(Item 18)
A computer program for a communication device, comprising:
The computer of the communication device has the following parts:
a display control unit that causes a display unit of the communication device to display an instruction screen for instructing execution of target processing including transmission of a public key when a first wireless connection is established between the communication device and a first external device via a first wireless interface of the communication device;
a first supply unit that supplies first instruction information for instructing transmission of the public key to the first wireless interface when an instruction to execute the target process is given in a state where the instruction screen is displayed, wherein the first instruction information is not supplied to the first wireless interface when an instruction to execute the target process is not given in a situation where the instruction screen is displayed;
an authentication request receiving unit configured to receive an authentication request using the public key from the first external device via a second wireless interface of the communication device after the first instruction information is supplied to the first wireless interface and the public key is transmitted from the first wireless interface to the first external device, the authentication request receiving unit wherein the second wireless interface is different from the first wireless interface;
an authentication response transmission unit configured to transmit an authentication response, which is a response to the authentication request, to the first external device via the second wireless interface when the authentication request is received from the first external device;
a connection information receiving unit that receives connection information from the first external device via the second wireless interface after the authentication response is transmitted to the first external device, the connection information receiving unit being information for establishing a second wireless connection between the communication device and a second external device via the second wireless interface;
a first establishing unit that establishes the second wireless connection between the communication device and the second external device via the second wireless interface using the connection information when the connection information is received from the first external device;
A computer program that acts as
(Item 19)
A computer program for a communication device, comprising:
The computer of the communication device has the following parts:
A state transition unit that shifts an operation state of the communication device from a disabled state to a enabled state after a first wireless connection is established between the communication device and a first external device via a first wireless interface of the communication device, wherein the disabled state is a state in which even if an authentication request using a public key is received from the first external device, an authentication response as a response to the authentication request is not transmitted, and the enabled state is a state in which the authentication response is sent in response to receiving the authentication request from the first external device. the state transition unit being in a state for transmission to the first external device;
an authentication request receiving unit configured to receive the authentication request from the first external device via a second wireless interface of the communication device after the first wireless connection is established and the public key is transmitted from the first wireless interface to the first external device, wherein the second wireless interface is different from the first wireless interface;
an authentication response transmitting unit configured to transmit the authentication response to the first external device via the second wireless interface when the authentication request is received from the first external device after the operating state of the communication device is shifted to the enabled state;
a connection information receiving unit that receives connection information from the first external device via the second wireless interface after the authentication response is transmitted to the first external device, the connection information receiving unit being information for establishing a second wireless connection between the communication device and a second external device via the second wireless interface;
a first establishing unit that establishes the second wireless connection between the communication device and the second external device via the second wireless interface using the connection information when the connection information is received from the first external device;
A computer program that acts as

2: communication system, 6: AP, 10: terminal, 16, 116: Wi-Fi I/F, 18, 118: NFC I/F, 40: connection application, 100: printer, 112: operation unit, 114: display unit, 120: print execution unit, 130: control unit, 132: CPU, 134: memory, 136: program

Claims (16)

A communication device,
a display unit;
a first wireless interface;
a second wireless interface different from the first wireless interface;
a control unit;
The control unit
a display control unit that causes the display unit to display an instruction screen for instructing execution of target processing including transmission of a public key when a first wireless connection is established between the communication device and the first external device through the first wireless interface;
a supply unit that supplies instruction information for instructing transmission of the public key to the first wireless interface when an instruction to execute the target process is given while the instruction screen is displayed, wherein the instruction information is not supplied to the first wireless interface when an instruction to execute the target process is not given while the instruction screen is displayed ;
with
the first wireless interface, after acquiring the instruction information from the control unit, transmits the public key to the first external device;
The control unit further
a state transition unit for transitioning an operation state of the communication device from an impossible state to an enabled state after the first wireless connection is established, wherein the impossible state is a state in which an authentication response as a response to the authentication request is not transmitted even if an authentication request using the public key is received from the first external device, and the enabled state is a state in which the authentication response is transmitted to the first external device in response to receiving the authentication request from the first external device;
an authentication request receiving unit configured to receive the authentication request from the first external device via the second wireless interface after the public key has been transmitted to the first external device;
an authentication response transmitting unit configured to transmit the authentication response to the first external device via the second wireless interface when the authentication request is received from the first external device after the operation state of the communication device has been shifted to the enabled state ;
a connection information receiving unit that receives connection information from the first external device via the second wireless interface after the authentication response is transmitted to the first external device, the connection information receiving unit being information for establishing a second wireless connection between the communication device and a second external device via the second wireless interface;
a first establishing unit that establishes the second wireless connection between the communication device and the second external device via the second wireless interface using the connection information when the connection information is received from the first external device;
A communication device comprising: A communication device,
a first wireless interface;
a second wireless interface different from the first wireless interface;
a control unit;
The control unit
A state transition unit that shifts an operation state of the communication device from a disabled state to a enabled state after a first wireless connection is established between the communication device and a first external device through the first wireless interface, wherein the disabled state is a state in which even if an authentication request using a public key is received from the first external device, an authentication response that is a response to the authentication request is not transmitted, and the enabled state is a state in which the authentication response is sent to the first external device in response to receiving the authentication request from the first external device. the state transition unit, which is a state to be transmitted to an external device of
with
the first wireless interface transmits the public key to the first external device after the first wireless connection is established;
The control unit further
an authentication request receiving unit configured to receive the authentication request from the first external device via the second wireless interface after the public key has been transmitted to the first external device;
an authentication response transmitting unit configured to transmit the authentication response to the first external device via the second wireless interface when the authentication request is received from the first external device after the operation state of the communication device has been shifted to the enabled state;
a connection information receiving unit that receives connection information from the first external device via the second wireless interface after the authentication response is transmitted to the first external device, the connection information receiving unit being information for establishing a second wireless connection between the communication device and a second external device via the second wireless interface;
a first establishing unit that establishes the second wireless connection between the communication device and the second external device via the second wireless interface using the connection information when the connection information is received from the first external device;
A communication device comprising: the first wireless interface transmits the public key and communication channel information indicating a first communication channel predetermined in the communication device to the first external device;
The enabled state is a state of monitoring reception of the authentication request using the first communication channel, and transmitting the authentication response to the first external device in response to receiving the authentication request from the first external device,
3. The communication device according to claim 1, wherein the authentication response transmission unit transmits the authentication response to the first external device via the second wireless interface when the authentication request using the first communication channel is received from the first external device after the operating state of the communication device is shifted to the enabled state. The communication device according to claim 3, wherein the first establishment unit establishes the second wireless connection between the communication device and the second external device via the second wireless interface using a second communication channel different from the first communication channel. The communication device according to any one of claims 1 to 4, wherein the first wireless interface transmits the public key to the first external device using the fourth wireless connection when the first wireless connection is disconnected and a fourth wireless connection is established between the communication device and the first external device via the first wireless interface. the first wireless interface comprises an interface memory;
the instruction information for instructing transmission of the public key includes the public key;
The first radio interface is
storing the public key included in the instruction information in the interface memory in response to obtaining the instruction information from the control unit;
6. The communication device of claim 5 , wherein if the fourth wireless connection is established after the first wireless connection is disconnected and the public key is stored in the interface memory, the fourth wireless connection is used to transmit the public key to the first external device. The control unit further
The communication device according to any one of claims 1 to 6 , further comprising: a mode transition unit that shifts the operation mode of the first wireless interface from a first mode to a second mode when a predetermined condition is satisfied, wherein the first mode is a mode in which wireless connection cannot be established via the first wireless interface, and the second mode is a mode in which wireless connection can be established via the first wireless interface. The control unit further
a controller memory;
a storage controller that stores the connection information in the controller memory when the connection information is received from the first external device;
when the power of the communication device is turned on in a situation where the connection information is not stored in the control unit memory, the predetermined condition is satisfied;
8. The communication device according to claim 7 , wherein said predetermined condition is not satisfied when said communication device is powered on while said connection information is stored in said controller memory. The communication device further
Equipped with an operation unit,
9. The communication device according to claim 8 , wherein said predetermined condition is satisfied when a specific operation via said operation unit is accepted in a situation where said connection information is stored in said control unit memory. When the first wireless connection is established, the first wireless interface uses the first wireless connection to transmit, to the first external device, activation information for activating the connection application program installed in the first external device for establishing the second wireless connection between the communication device and the second external device via the second wireless interface;
10. The communication device according to claim 1 , wherein said authentication request receiving unit receives said authentication request transmitted according to said connection application program from said first external device. The communication device according to any one of claims 1 to 10 , wherein the first wireless interface is an NFC (Near Field Communication) type tag interface. The second external device is a device different from the first external device and is a master station device that should operate as a master station of a wireless network,
The communication device according to any one of claims 1 to 11 , wherein the first establishing unit establishes the second wireless connection between the communication device and the second external device via the second wireless interface, and causes the communication device to participate in the wireless network as a slave station. 13. The communication device according to any one of claims 1 to 12 , wherein said connection information includes authentication information for authenticating received information received from said second external device. The control unit further
The communication device according to any one of claims 1 to 13 , comprising the operation control unit that operates the communication device as an Enrollee conforming to the Wi-Fi standard after the authentication response is transmitted to the first external device, wherein the first external device operates as a configurator conforming to the Wi-Fi standard. A computer program for a communication device, comprising:
The computer of the communication device has the following parts:
a display control unit that causes a display unit of the communication device to display an instruction screen for instructing execution of target processing including transmission of a public key when a first wireless connection is established between the communication device and a first external device via a first wireless interface of the communication device;
a supply unit that supplies instruction information for instructing transmission of the public key to the first wireless interface when an instruction to execute the target process is given while the instruction screen is displayed, wherein the instruction information is not supplied to the first wireless interface when an instruction to execute the target process is not given while the instruction screen is displayed ;
a state transition unit for transitioning an operation state of the communication device from an impossible state to an enabled state after the first wireless connection is established, wherein the impossible state is a state in which an authentication response as a response to the authentication request is not transmitted even if an authentication request using the public key is received from the first external device, and the enabled state is a state in which the authentication response is transmitted to the first external device in response to receiving the authentication request from the first external device;
an authentication request receiving unit configured to receive the authentication request from the first external device via a second wireless interface of the communication device after the instruction information is supplied to the first wireless interface and the public key is transmitted from the first wireless interface to the first external device, wherein the second wireless interface is different from the first wireless interface;
an authentication response transmitting unit configured to transmit the authentication response to the first external device via the second wireless interface when the authentication request is received from the first external device after the operation state of the communication device has been shifted to the enabled state ;
a connection information receiving unit that receives connection information from the first external device via the second wireless interface after the authentication response is transmitted to the first external device, the connection information receiving unit being information for establishing a second wireless connection between the communication device and a second external device via the second wireless interface;
a first establishing unit that establishes the second wireless connection between the communication device and the second external device via the second wireless interface using the connection information when the connection information is received from the first external device;
A computer program that acts as A computer program for a communication device, comprising:
The computer of the communication device has the following parts:
A state transition unit that shifts an operation state of the communication device from a disabled state to a enabled state after a first wireless connection is established between the communication device and a first external device via a first wireless interface of the communication device, wherein the disabled state is a state in which even if an authentication request using a public key is received from the first external device, an authentication response as a response to the authentication request is not transmitted, and the enabled state is a state in which the authentication response is sent in response to receiving the authentication request from the first external device. the state transition unit being in a state for transmission to the first external device;
an authentication request receiving unit configured to receive the authentication request from the first external device via a second wireless interface of the communication device after the first wireless connection is established and the public key is transmitted from the first wireless interface to the first external device, wherein the second wireless interface is different from the first wireless interface;
an authentication response transmitting unit configured to transmit the authentication response to the first external device via the second wireless interface when the authentication request is received from the first external device after the operation state of the communication device has been shifted to the enabled state;
a connection information receiving unit that receives connection information from the first external device via the second wireless interface after the authentication response is transmitted to the first external device, the connection information receiving unit being information for establishing a second wireless connection between the communication device and a second external device via the second wireless interface;
a first establishing unit that establishes the second wireless connection between the communication device and the second external device via the second wireless interface using the connection information when the connection information is received from the first external device;
A computer program that acts as

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