JP2023137429A - Communication apparatus, computer program for communication apparatus, and application program for terminal device - Google Patents

Abstract

To provide a technique for establishing a wireless connection between a communication apparatus and an access point, using a new method.SOLUTION: When receiving a first predetermined operation from a user, a communication apparatus establishes a first wireless connection with a terminal device, and receives an output request for a specific image which is obtained using a bootstrapping key of the communication apparatus from the terminal device, through the first wireless connection. The communication apparatus receives, after the specific image is output, an authentication request based on DPP system of Wi-Fi standard, from the terminal device, using the bootstrapping key, receives first connection information based on DPP system, and establishes a second wireless connection with a first access point by using the first connection information. The communication apparatus receives second connection information based on a system different from the DPP system, from the terminal device, through the first wireless connection, and establishes a third wireless connection with a second access point by using the second connection information.SELECTED DRAWING: Figure 3

Description

This specification discloses a technique for establishing a wireless connection between a communication device and an access point.

Patent Document 1 discloses a technique for establishing a Wi-Fi connection between a printer and an access point (hereinafter referred to as "AP") using a terminal. In particular, a technique has been disclosed for establishing a Wi-Fi connection between a printer and an AP according to the DPP (Device Provisioning Protocol) method. If the AP does not support the DPP method, the terminal establishes a Wi-Fi connection between the printer and the AP according to a method different from the DPP method.

Japanese Patent Application Publication No. 2020-113851

This specification provides a technique for establishing a wireless connection between a communication device and an access point using a novel approach.

A communication device disclosed in this specification includes an output unit, a wireless interface for performing wireless communication in accordance with the Wi-Fi standard, and a wireless interface that performs wireless communication when a first predetermined operation is received from a user. a first establishing unit that establishes a first wireless connection with a terminal device through the communication device, wherein the first wireless connection is such that the communication device operates as a master station and the terminal device operates as a slave station; obtained from the terminal device via the wireless interface using the first establishment unit and the first wireless connection, which is a connection for an output request receiving unit that receives an output request requesting output of a specific image; an output control unit that causes the output unit to output the specific image when the output request is received from the terminal device; and an output control unit that causes the output unit to output the specific image. is output, an authentication request is made from the terminal device via the wireless interface in accordance with the DPP (Device Provisioning Protocol) method of the Wi-Fi standard, and the bootstrapping key is used. an authentication request receiving unit that receives the authentication request; and when the authentication request is received from the terminal device, first connection information according to the DPP method is sent from the terminal device via the wireless interface. When the first connection information receiving unit receives the first connection information from the terminal device, the first connection information receiving unit receives the second wireless connection information via the wireless interface using the first connection information. a second establishing unit that establishes a connection with the first access point; and a second establishing unit that uses the first wireless connection to transmit data from the terminal device via the wireless interface according to a method different from the DPP method. a second connection information receiving unit that receives second connection information; and when the second connection information is received from the terminal device, the second connection information is used to receive the second connection information via the wireless interface. and a third establishing unit that establishes a third wireless connection with the second access point.

According to the above configuration, when the first predetermined operation is received from the user, the communication device establishes the first wireless connection with the terminal device, and uses the first wireless connection to send an output request from the terminal device. A specific image obtained using the bootstrapping key of the communication device is output. Thereby, the communication device can establish a second wireless connection according to the DPP method with the first access point. In addition, when the communication device uses the first wireless connection to receive, from the terminal device, not an output request but second connection information according to a method different from the DPP method, the communication device uses the second connection information. The information can be used to establish a third wireless connection with the second access point.

This specification also discloses an application program for a terminal device. The terminal device includes a wireless interface for performing wireless communication according to the Wi-Fi standard, a camera, and a computer, and the application program connects the computer to the following parts, that is, the wireless interface. a first establishing unit that establishes a first wireless connection with a communication device via a first wireless connection, wherein the first wireless connection is configured such that the communication device operates as a master station and the terminal device operates as a slave station; and an output request transmitting unit that transmits an output request via the wireless interface using the first wireless connection when a predetermined condition is satisfied. The output request is a request for causing an output unit of the communication device to output a specific image obtained using a bootstrapping key of the communication device, and the output request transmission unit and the output request. an acquisition unit that acquires the bootstrapping key when the specific image is output by the communication device in response to the specific image being transmitted to the communication device, and the specific image is photographed by the camera; , when the bootstrapping key is acquired, an authentication request is made via the wireless interface according to the DPP (Device Provisioning Protocol) method of the Wi-Fi standard, and the bootstrapping key is used. an authentication request transmitting unit that transmits the authenticated authentication request to the communication device, and first connection information according to the DPP method via the wireless interface when the authentication request is transmitted to the communication device; a first connection information transmitting unit that transmits information to the communication device, the first connection information being information for establishing a second wireless connection between the communication device and the first access point; the first connection information transmitting unit, and when the predetermined condition is not met, the first wireless connection is used to transmit the data via the wireless interface according to a method different from the DPP method. a second connection information transmitter that transmits second connection information to the communication device, the second connection information establishing a third wireless connection between the communication device and the second access point; It may also function as the second connection information transmitter, which is information for establishing the connection.

According to the above configuration, the terminal device establishes the first wireless connection with the communication device. If the predetermined condition is met, the terminal device uses the first wireless connection to transmit an output request and causes the communication device to output a specific image obtained using the bootstrapping key of the communication device. The terminal device acquires a bootstrapping key by photographing a specific image, transmits an authentication request using the bootstrapping key to the communication device, and transmits first connection information to the communication device. Thereby, a second wireless connection can be established between the communication device and the first access point. On the other hand, if the predetermined condition is not satisfied, the terminal device uses the first wireless connection to transmit second connection information according to a method different from the DPP method to the communication device. Thereby, a third wireless connection can be established between the communication device and the second access point.

A computer program for implementing the above communication device, a computer readable storage medium storing the computer program, and a method executed by the above communication device are also novel and useful. Also novel and useful are the computer-readable recording medium storing the application program for the terminal device, the terminal device itself, and the method executed by the terminal device. Further, a communication system including the above terminal device and the above communication device is also new and useful.

The configuration of the communication system is shown. 5 shows a flowchart of application processing executed by an application program of a terminal. 7 shows a flowchart of connection processing performed by the printer. A sequence diagram of case A is shown. A sequence diagram of case B is shown. A sequence diagram of case B-1 is shown. A sequence diagram continuing from FIG. 6 is shown. A sequence diagram of case B-2 is shown. A sequence diagram of case B-3 is shown. A sequence diagram of case C is shown.

(Example)
(Configuration of communication system 2; Figure 1)
As shown in FIG. 1, the communication system 2 includes a terminal 10, a plurality of printers 100, 200, and a plurality of APs (abbreviations for Access Points) 6A, 6B. The technology of this embodiment uses the terminal 10 to establish a wireless connection (hereinafter referred to as "Wi-Fi connection") between a printer (for example, 100) and an AP (for example, 6A) according to the Wi-Fi standard. It is a technology that establishes

(Configuration of terminal 10)
The terminal 10 is a portable terminal device such as a mobile phone (for example, a smartphone), a PDA, or a tablet PC. In a modification, the terminal 10 may be a stationary PC, a notebook PC, or the like. The terminal 10 includes an operation section 12, a display section 14, a Wi-Fi interface 16, a camera 18, and a control section 30. Each part 12 to 30 is connected to a bus line (numerals omitted). In the following, the interface will be referred to as "I/F".

The operation unit 12 includes a plurality of keys. A user can input various instructions to the terminal 10 by operating the operation unit 12. The display unit 14 is a display for displaying various information. The display unit 14 also functions as a so-called touch panel (that is, an operation unit that accepts user operations). The camera 18 is a device for photographing objects. In this embodiment, the camera 18 is used to photograph a QR code (registered trademark) displayed on a printer (eg, 100).

The Wi-Fi I/F 16 is a wireless I/F for performing Wi-Fi communication according to the Wi-Fi standard. Wi-Fi standards include, for example, the IEEE (Institute of Electrical and Electronics Engineers, Inc.) 802.11 standard and standards equivalent to it (e.g. 802.11a, 11b, 11g, 11n, 11ac, etc.) is a wireless communication standard for performing wireless communication. In particular, the Wi-Fi I/F 16 supports the DPP (Device Provisioning Protocol) method developed by the Wi-Fi Alliance. Details of the DPP method are described in the standard document "Wi-Fi Easy Connect (trademark) Specification Version 2.0" created by the Wi-Fi Alliance. The Wi-Fi I/F 16 further supports the WFD (abbreviation for Wi-Fi Direct (registered trademark)) method developed by the Wi-Fi Alliance. Details of the WFD method are described in the standard document "Wi-Fi Direct (registered trademark) Specification Version 1.9" created by the Wi-Fi Alliance.

Wi-Fi I/F 16 is physically one chip. However, two MAC addresses are assigned to the Wi-Fi I/F 16, so the first I/F 16A is assigned the first MAC address, and the second MAC address is assigned. A second I/F 16B is realized. In addition, in a modified example, the first I/F 16A and the second I/F 16B may be configured by different chips.

The first I/F 16A is an I/F for performing wireless communication according to a method different from the WFD method (eg, normal Wi-Fi method, DPP method, etc.). The normal Wi-Fi method is a method for establishing a Wi-Fi connection with the AP using an SSID (abbreviation for Service Set Identifier) that identifies the AP and a password authenticated by the AP. . The second I/F 16B is an I/F for performing wireless communication according to the WFD method. Note that in this embodiment, since there is no situation in which the terminal 10 performs wireless communication according to the WFD method, there will be no explanation of the use of the second I/F 16B from here on.

The control unit 30 includes a CPU 32 and a memory 34. The CPU 32 executes various processes according to programs 36 and 38 stored in the memory 34. The memory 34 is composed of volatile memory, nonvolatile memory, and the like.

The OS (abbreviation for Operating System) program 36 is a program for realizing the basic operations of the terminal 10. In this embodiment, the OS program 36 is assumed to be Android (registered trademark). However, in a modified example, the OS program 36 may be another OS program. Hereinafter, the OS program will be referred to as "OS". The application 38 may, for example, establish a Wi-Fi connection between the terminal 10 and an AP (for example, AP6A), or establish a Wi-Fi connection between a printer (for example, 100) and an AP (for example, AP6A). This is a program for In the following, an application will be referred to as an "app".

The application 38 is installed on the terminal 10 from a server (not shown) on the Internet provided, for example, by the vendor of the OS 36 or the vendor of the printers 100, 200. By supplying instructions to the OS 36, the application 38 can cause the OS 36 to execute various processes, or cause other apps to execute various processes via the OS 36. Therefore, each process executed by the OS 36 or other apps in response to an instruction from the app 38 can also be said to be a process realized by the app 38 (that is, the CPU 32 functions as an execution unit that executes the process).

The memory 34 further stores AP information for the terminal 10 to establish a Wi-Fi connection with the AP. The AP information includes the SSID and password of the AP. The AP information may be information about an AP with which the terminal 10 currently establishes a Wi-Fi connection, or may be information about an AP with which the terminal 10 established a Wi-Fi connection in the past.

(Configuration of printers 100 and 200)
The printer 100 is a peripheral device (for example, a peripheral device of the terminal 10) that can execute a printing function. In a modified example, the printer 100 may be a multi-function device that can perform a scan function, a FAX function, etc. in addition to the print function. The printer 100 has a printer ID "AAA". The printer 100 includes an operation section 112, a display section 114, a Wi-Fi I/F 116, a print execution section 118, and a control section 130. Each part 112 to 130 is connected to a bus line (numerals omitted).

The operation unit 112 includes a plurality of buttons including a Wi-Fi button 113. 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 display unit 114 also functions as a so-called touch panel (that is, an operation unit that accepts user operations). The printing execution unit 118 includes a printing mechanism such as an inkjet method or a laser method.

The Wi-Fi I/F 116 is a wireless I/F for performing Wi-Fi communication according to the Wi-Fi standard. In particular, the Wi-Fi I/F 116 supports the DPP method and the SoftAP method. Wi-Fi I/F 116 is physically one chip. However, two MAC addresses MA and MB are assigned to the Wi-Fi I/F 116, and as a result, the first I/F 116A is assigned the MAC address MA, and the first I/F 116A is assigned the MAC address MB. A second I/F 116B is realized. In addition, in a modification, the first I/F 116A and the second I/F 116B may be configured by different chips.

The first I/F 116A is an I/F for performing wireless communication according to the normal Wi-Fi method and DPP method. The second I/F 116B is an I/F for performing wireless communication according to the DPP method and the SoftAP method. The SoftAP method is a method in which the printer 100 operates as a master station (ie, SoftAP) of a Wi-Fi network and establishes a Wi-Fi connection with another device (eg, the terminal 10).

The Wi-Fi I/F 116 further supports WPS (abbreviation for Wi-Fi Protected Setup) developed by the Wi-Fi Alliance. WPS is a so-called automatic wireless connection or easy wireless connection, which allows a connection between a pair of devices to be established without the user having to enter connection information (e.g. SSID, password, etc.) to establish a Wi-Fi connection. This is a technology that allows you to easily establish a Wi-Fi connection. In particular, the Wi-Fi I/F 116 supports the WPS PBC (abbreviation for Push Button Configuration) method. The PBC method is a method for establishing a Wi-Fi connection between a pair of devices when a user performs a predetermined operation on each of the devices.

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

The printer 200 is a peripheral device (for example, a peripheral device of the terminal 10) that can execute a printing function, and has a printer ID "BBB". The printer 200 has the same configuration as the printer 100, except that the Wi-Fi I/F (not shown) of the printer 200 does not support the DPP method.

(Configuration of AP6A, 6B)
The AP 6A is a normal access point called a wireless access point or a wireless LAN router. AP6A supports the DPP method. The AP 6A relays communication between a pair of devices belonging to a Wi-Fi network in which the AP 6A operates as a master station. AP6A stores SSID "S1" and PW "P1". The SSID "S1" is information that identifies the Wi-Fi network formed by the AP 6A. PW "P1" is authentication information used when allowing another device to participate in the Wi-Fi network. The AP 6A supports the WPS PBC method and includes a WPS button 61.

The AP 6B stores an SSID "S2" and a PW "P2", and includes a WPS button 62. AP6B has the same configuration as AP6A.

(App processing; Figure 2)
With reference to FIG. 2, application processing executed by the CPU 32 of the terminal 10 according to the application 38 will be described. The application process in FIG. 2 is triggered by a setup operation performed by the user.

When the user operates the setup button included in the screen displayed by the application 38, the CPU 32 determines that the setup operation has been accepted and proceeds to S10. In S10, the CPU 32 acquires AP information from the memory 34. In this embodiment, the AP information is information regarding the AP with which the terminal 10 is currently establishing a Wi-Fi connection via the first I/F 16A. Hereinafter, the AP in question will be referred to as a "target AP," and the SSID that identifies the target AP (that is, the SSID included in the AP information) will be referred to as a "target SSID."

In S12, the CPU 32 transmits a disconnection signal to the target AP via the first I/F 16A to disconnect the Wi-Fi connection with the target AP. Thereby, the CPU 32 can establish a Wi-Fi connection with another device (in this embodiment, a printer) via the first I/F 16A.

In S14, the CPU 32 establishes a Wi-Fi connection with the printer via the first I/F 16A. The printer functions as a Soft AP (ie, a master station) in response to a Wi-Fi button operation from a user. In the following, this printer will be referred to as a "target printer."

In S16, the CPU 32 uses the Wi-Fi connection established in S14 to execute communication at or above the network layer of the OSI (Open System Interconnection) reference model via the first I/F 16A. Specifically, the CPU 32 transmits an inquiry request for inquiring about device information related to the target printer. The device information includes information indicating whether the target printer supports the DPP method, the printer ID of the target printer, capability information of the target printer, and one item with which the target printer can establish a Wi-Fi connection. and one or more SSIDs that identify the above APs. The capability information is information indicating the printing capabilities that the target printer can perform (for example, the number of printing colors, resolution, whether double-sided printing is possible, etc.).

In S20, the CPU 32 monitors reception of an inquiry response from the target printer via the first I/F 16A using the Wi-Fi connection established in S14. If the CPU 32 receives an inquiry response from the target printer (YES in S20), the process proceeds to S22; if it does not receive an inquiry response from the target printer (NO in S20), it returns to S16 and sends the inquiry request to the target printer. to send again.

In S22, the CPU 32 displays a connection selection screen on the display unit 14 using information included in the received inquiry response. The connection selection screen is a screen for allowing the user to select the SSID of the AP with which a Wi-Fi connection is to be established with the target printer. The connection selection screen includes a printer ID included in the inquiry response, capability information included in the inquiry response, and one or more SSIDs included in the inquiry response. By viewing the connection selection screen, the user can confirm device information related to the target printer.

When the inquiry response includes two or more SSIDs, the CPU 32 further determines whether the two or more SSIDs include the target SSID in the AP information acquired in S10. When the CPU 32 determines that the two or more SSIDs include the target SSID, the CPU 32 displays a connection selection screen on the display unit 14 in which the target SSID is arranged at the top and other SSIDs are arranged at the bottom. . That is, on the connection selection screen, the target SSID is displayed preferentially over other SSIDs. For this purpose, the user can appropriately select the target SSID (ie, the SSID of the AP with which the terminal 10 currently establishes a Wi-Fi connection).

In S24, the CPU 32 receives a selection of one SSID included in the connection selection screen from the user. Hereinafter, the SSID selected here will be referred to as a "selected SSID", and the AP identified by the selected SSID will be referred to as a "selected AP".

In S30, the CPU 32 determines whether the selected SSID and the target SSID match. If the CPU 32 determines that the selected SSID and the target SSID match (YES in S30), the process proceeds to S32, and if it determines that the selected SSID and the target SSID do not match (NO in S30), the process proceeds to S50.

In S32, the CPU 32 determines whether the target printer supports the DPP method. Specifically, the CPU 32 determines that the target printer supports the DPP method if the inquiry response received in S20 includes information indicating that the target printer supports the DPP method. (YES in S32), the process proceeds to S34, and if the inquiry response does not include the information, it is determined that the target printer does not support the DPP method (NO in S32), and the process proceeds to S50.

In S34, the CPU 32 uses the Wi-Fi connection established in S14 to transmit a DPP execution request to the target printer via the first I/F 16A. The DPP execution request is a request to shift the state of the target printer from the DPPOFF state to the DPPON state. The DPP execution request is a request for causing the target printer to display a QR code obtained using Bootstrapping information (hereinafter referred to as "BS information") of the target printer. The DPPOFF state is a state in which the target printer cannot transmit an Authentication Response to an Authentication Request according to the DPP method, and the DPPON state is a state in which the target printer can transmit an Authentication Response. Hereinafter, Authentication will be referred to as "Auth," Request will be referred to as "Req," and Response will be referred to as "Res." The BS information includes the public key of the target printer.

As described above, the terminal 10 transfers the state of the target printer from the DPPOFF state to the DPPON state by transmitting a DPP execution request to the target printer. The DPPON state is usually a state in which the processing load on the target printer is higher than the DPPOFF state. Since the state of the target printer is maintained in the DPP OFF state during the period before Auth is executed (that is, the period up to S32), the processing load on the target printer can be reduced. Then, since the state of the target printer will be shifted to the DPPON state at the timing when Auth is executed from now on, the target printer will appropriately send Auth Res to the terminal 10 in response to receiving the Auth Req from the terminal 10. be able to.

In S35, the CPU 32 reads the QR code by accepting an operation from the user to read the QR code displayed on the target printer. Then, the CPU 32 decodes the QR code and obtains the BS information of the target printer.

In S36, the CPU 32 uses the Wi-Fi connection established in S14 to send a disconnection request to the target printer via the first I/F 16A. As a result, the Wi-Fi connection established in S14 is disconnected. As a result, the CPU 32 can establish a Wi-Fi connection with another device (target AP in this embodiment) via the first I/F 16A.

In S38, the CPU 32 re-establishes a Wi-Fi connection with the target AP via the first I/F 16A using the AP information acquired in S10.

In S40, the CPU 32 executes DPP communication processing. The DPP communication process is a process of establishing a Wi-Fi connection between the target printer and the target AP by performing various communications such as Auth according to the DPP method with the target printer. When S40 ends, the process of FIG. 2 ends.

In S50, the CPU 32 displays an input screen on the display unit 14. The input screen is a screen for allowing the user to input the password of the selected AP identified by the selected SSID.

In S52, the CPU 32 obtains a password by accepting a password input from the user.

In S60, the CPU 32 uses the Wi-Fi connection established in S14 to transmit a connection instruction to the target printer via the first I/F 16A. The connection instruction is a signal that instructs the target printer to establish a Wi-Fi connection with the AP using the SSID and password included in the connection instruction. As a result, a Wi-Fi connection is established between the target printer and the selected AP. When S60 ends, the process of FIG. 2 ends.

As described above, if YES in S30, the terminal 10 transmits a DPP execution request to the target printer (S34), and acquires BS information from the target printer by reading the QR code displayed on the target printer ( S35), the DPP communication process is executed using the BS information. On the other hand, if NO in S30, the terminal 10 prompts the user to input the password of the selected AP without reading the QR code (S50). That is, in a case where DPP communication processing is executed, the user does not need to input the password of the selected AP. In the case of YES in S30, the terminal 10 can omit the user from inputting a password by preferentially executing the DPP process. This improves user convenience. In a modified example, if the answer is NO in S32, the terminal 10 may omit S50 and S52 and, in S60, transmit a connection instruction including the AP information acquired in S10 to the target printer.

Furthermore, in S60, a connection instruction including information for the target printer to establish a Wi-Fi connection with the selected AP (i.e., the SSID and password of the selected AP) is sent to the target printer without performing DPP authentication. Ru. Therefore, there is a possibility that the SSID and password of the selected AP will be leaked. On the other hand, in S40, after the DPP authentication is performed, information for the target printer to establish a Wi-Fi connection with the selected AP is transmitted to the target printer. Therefore, communication of the information is performed securely. If YES in S30, the terminal 10 can securely communicate information for the target printer to establish a Wi-Fi connection with the selected AP by giving priority to executing DPP processing. .

(Printer processing; Figure 3)
Next, with reference to FIG. 3, the connection process executed by the CPU 132 of the printer 100 according to the program 136 will be described. The connection process in FIG. 3 is started when the user operates the Wi-Fi button 113 (hereinafter referred to as "Wi-Fi button operation").

When the user operates the Wi-Fi button, the CPU 132 proceeds to S80. In a modification, the CPU 132 may proceed to S80 when the printer 100 is powered on without storing information for the printer 100 to establish a Wi-Fi connection with the AP.

In S80, the CPU 132 starts SoftAP (abbreviation for Software Access Point). Thereby, the printer 100 operates as a master station of the Wi-Fi network. In this way, the printer 100 shifts to the master station in response to receiving a Wi-Fi button operation from the user, so it can shift to the master station at the timing desired by the user. Communication according to the SoftAP method is performed via the second I/F 116B.

In S82, the CPU 132 broadcasts a Probe request via the first I/F 116A. Thereby, the CPU 132 receives a Probe response including the SSID of the AP from each of the one or more APs existing around the printer 100 via the first I/F 116A.

In S84, the CPU 132 determines whether there is a Probe response that includes information indicating that WPS is being executed among the one or more received Probe responses. If the CPU 132 determines that a Probe response including information indicating that WPS is being executed exists (YES in S84), the process proceeds to S120, and if it determines that the Probe response does not exist (NO in S84), the process proceeds to S90. .

In S120, the CPU 32 executes WPS connection processing. The WPS connection process is a process for establishing a Wi-Fi connection according to the WPS method with the AP that is the source of the Probe response including information indicating that WPS is being executed. When S120 ends, the process of FIG. 3 ends.

In S90, the CPU 132 monitors reception of a Probe request from a terminal (eg, 10) via the second I/F 116B. If the CPU 132 receives a Probe request from the terminal (YES in S90), the process proceeds to S92, and if it does not receive a Probe request from the terminal (NO in S90), the process returns to S84.

In S92, the CPU 132 establishes a Wi-Fi connection with the terminal that sent the Probe request in S90. In the following, this terminal will be referred to as a "target terminal." The printer 100 establishes a Wi-Fi connection with the target terminal, and causes the target terminal to belong as a slave station to the wireless network in which the printer 100 operates as a master station.

In S100, the CPU 132 executes inquiry response processing. The inquiry response process is a process for transmitting device information of the printer 100 to the target terminal. Specifically, the CPU 132 first transmits a Probe request by broadcast via the first I/F 116A, and receives a Probe request from each of one or more APs existing around the printer 100, including the SSID of the AP. Receive a Probe response. Each of the one or more APs that are the sender of one or more Probe responses can be said to be an AP with which the printer 100 can establish a Wi-Fi connection. Thereafter, in response to receiving the inquiry request from the target terminal via the second I/F 116B, the CPU 132 uses the Wi-Fi connection established in S92 to send an inquiry response including device information. is sent to the target device. The device information includes one or more SSIDs included in one or more Probe responses received from the one or more APs. In this way, since the printer 100 sends to the target terminal one or more SSIDs of one or more APs with which the printer 100 can establish a Wi-Fi connection, A Wi-Fi connection can be properly established with the AP.

In S102, the CPU 132 determines whether a DPP execution request has been received from the target terminal. When receiving a DPP execution request (see S34 in FIG. 2) from the target terminal via the second I/F 116B, the CPU 132 determines YES in S102 and proceeds to S110. When receiving a connection instruction (see S60 in FIG. 2) from the target terminal via the second I/F 116B, the CPU 132 determines NO in S102 and proceeds to S130.

In S110, the CPU 132 executes DPP connection processing. DPP connection processing is processing for establishing a Wi-Fi connection with a target AP according to the DPP method. When S110 ends, the process of FIG. 3 ends.

In S130, the CPU 132 executes non-DPP connection processing. Non-DPP connection processing uses the SSID and password of the selected AP included in the connection instruction to establish a Wi-Fi connection with the selected AP (that is, an AP different from the target AP) according to the normal Wi-Fi method, which is different from the DPP method. This is a process for establishing an Fi connection. When S130 ends, the process of FIG. 3 ends.

(Specific cases; Figures 4 to 10)
A specific case realized by the processing in FIGS. 2 and 3 will be described with reference to FIGS. 4 to 10. In the following, for ease of understanding, the operations executed by the CPUs 32 and 132 of each device will not be described with the CPU as the main character, but will be described with each device (for example, the terminal 10, the printer 100) as the main character. 4 to 10, regarding communication between the printer 100 and each device 10, 6A, 6B, a solid line indicates communication executed via the first I/F 116A of the printer 100, and a second Communication executed via the I/F 116B is indicated by a broken line. Note that all communications performed by the terminal 10 are performed via the first I/F 16A, so below, when describing communications performed by the terminal 10, "via the first I/F 16A" is used. ” is omitted.

(Case A; Figure 4)
With reference to FIG. 4, a case A will be described in which a Wi-Fi connection is established between the printer 100 and the AP 6A according to the WPS method. In the initial state of FIG. 4, the terminal 10 has established a Wi-Fi connection with the AP 6A. Therefore, the terminal 10 stores the AP information of the AP 6A (ie, SSID "S1" and PW "P1"). Note that the printer 100 does not yet store AP information, such as when the printer 100 is powered on for the first time after being shipped.

The printer 100 receives a power ON operation from the user at T2. Next, the printer 100 receives a Wi-Fi button operation from the user at T4 (triggering the process in FIG. 3). In this case, the printer 100 starts SoftAP at T6 (S80). SoftAP of the printer 100 uses SSID "S3" and PW "P3". Next, at T8, the printer 100 broadcasts a Probe request via the first I/F 116A (S82).

The AP 6A starts operation according to the WPS method by accepting an operation of the WPS button 61 from the user at T10. Specifically, when the AP 6A receives a Probe request from the printer 100 at T8, the AP 6A transmits a Probe response including the SSID "S1" and information indicating that WPS is being executed to the printer 100 at T12.

At T12, the printer 100 receives a Probe response including information indicating that WPS is being executed from the AP 6A via the first I/F 116A (YES at S84). In this case, at T14, the printer 100 establishes a Wi-Fi connection with the AP 6A according to the WPS method (S120). In this way, in case A, the user establishes a Wi-Fi connection between the printer 100 and the AP 6A according to the PBC method of the WPS method by pressing the WPS button 61 of the AP 6A without entering the password of the AP 6A. can be established.

(Case B; Figure 5)
Next, with reference to FIG. 5, case B in which a Wi-Fi connection is established between the printer 100 and the terminal 10 will be described. The initial state in FIG. 5 is the same as the initial state in FIG. 4, and the processing from T102 to T108 is the same as from T2 to T8 in FIG.

In this case, the AP 6A does not accept a WPS button operation (see T10 in FIG. 4) from the user. In this case, at T112, the AP 6A transmits to the printer 100 a Probe response that includes the SSID "S1" of the AP 6A and does not include information indicating that WPS is being executed.

At T112, the printer 100 receives a Probe response that does not include information indicating that WPS is being executed from the AP 6A via the first I/F 116A (NO at S84).

When the terminal 10 receives an application activation operation from the user at T120, the terminal 10 activates the application 38 at T122. Further, the terminal 10 receives a setup operation for the application 38 from the user at T124 (triggering the process in FIG. 2). In this case, the terminal 10 acquires the AP information of the AP 6A (ie, SSID "S1", PW "P1") from the memory 34 at T130 (S10).

Next, at T132, the terminal 10 transmits a disconnection signal to the AP 6A via the first I/F 16A (S12). As a result, the Wi-Fi connection between the terminal 10 and the AP 6A is disconnected. Furthermore, the terminal 10 broadcasts a Probe request at T140.

At T140, the printer 100 receives a probe request from the terminal 10 via the second I/F 116B (YES at S90). In this case, the printer 100 transmits a Probe response including the SSID "S3" to the terminal 10 via the second I/F 116B at T142.

The application 38 of the terminal 10 stores in advance the SSID "S3" and the password "P3" of the printer 100 that operates as SoftAP. Therefore, when the terminal 10 receives the Probe response from the printer 100 at T142, it determines that the SSID "S3" included in the Probe response matches the stored SSID "S3". That is, the terminal 10 determines that the printer 100 that is the transmission source of the Probe response is the connection target. Then, at T144, the terminal 10 establishes a Wi-Fi connection with the printer 100 using the stored password "P3" (S14).

At T144, the printer 100 establishes a Wi-Fi connection with the terminal 10 via the second I/F 116B (S92), and then proceeds to the process of FIG. 6. In the following, this Wi-Fi connection will be referred to as a "temporary connection."

(Case B-1; Figure 6, Figure 7)
Next, with reference to FIGS. 6 and 7, a case B-1 will be described in which a Wi-Fi connection according to the DPP method is established between the printer 100 and the AP 6A using a temporary connection.

At T150, the printer 100 broadcasts a probe request via the first I/F 116A (S100). As a result, the printer 100 receives a Probe response including the SSID "S1" from the AP 6A via the first I/F 116A at T152 (S100), and at T154, via the first I/F 116A, A Probe response including SSID "S2" is received from AP 6B (S100).

At T160, the terminal 10 uses the temporary connection to transmit an inquiry request to the printer 100 (S16).

When the printer 100 receives an inquiry request from the terminal 10 via the second I/F 116B using the temporary connection at T160, the printer 100 uses the temporary connection to connect the inquiry request to the second I/F 116B at T162. The inquiry response is transmitted to the terminal 10 via (S100). The inquiry response includes device information of the printer 100. In this case, the device information includes DPP support information indicating that the printer 100 supports the DPP method, printer ID "AAA" of the printer 100, capability information of the printer 100, and is received at T152 and T154. It includes two SSIDs "S1" and "S2". Note that in a modified example, the printer 100 may execute the processes from T150 to T154 after receiving the inquiry request from the terminal 10 at T160.

When the terminal 10 receives the inquiry response from the printer 100 using the temporary connection at T162 (YES at S20), the terminal 10 displays the connection selection screen SC1 using the information included in the inquiry response at T170. (S22). The connection selection screen SC1 includes a printer ID "AAA", capability information of the printer 100, and two SSIDs "S1" and "S2". Here, the SSID "S1" included in the AP information stored in the terminal 10 is displayed above (that is, preferentially) the other SSID "S2".

The terminal 10 receives the selection of SSID "S1" from the user at T172 (S24). The terminal 10 determines that the selected SSID "S1" matches the SSID included in the AP information acquired at T130 (that is, the AP information in the memory 34 of the terminal 10) (YES at S30), and the SSID "S1" is received at S162. It is determined that the inquiry response includes DPP support information (YES in S32). In this case, at T180, the terminal 10 uses the temporary connection to transmit a DPP execution request to the printer 100 (S34).

When the printer 100 receives a DPP execution request from the terminal 10 via the second I/F 116B using the temporary connection at T80 (YES at S102), the printer 100 shifts from the DPPOFF state to the DPPON state at T181. (S110). In this case, the printer 100 generates the public key PKpr of the printer 100 at T182 using the MAC address MA of the first I/F 116A of the printer 100 (S110). Specifically, the public key PKpr includes a character string indicating the MAC address MA. In this way, since the public key PKpr is generated from the MAC address MA, which is unique identification information assigned to the printer 100, it is possible to prevent duplication of public keys of various printers including the printer 100. . Furthermore, since the printer 100 generates the public key PKpr at T182, it is not necessary to store the public key PKpr in advance.

Next, at T184, the printer 100 displays a QR code Q1 obtained by encoding the generated public key PKpr, MAC address MA, and channel information CI (S110). The channel information CI is information indicating one or more channels out of a plurality of channels (in other words, frequency width) that can be used by the printer 100.

At T186, the terminal 10 uses the temporary connection to transmit a disconnection request to the printer 100 (S36).

When the printer 100 receives a disconnection request from the terminal 10 via the second I/F 116B using the temporary connection at T186, it stops SoftAP at T188. As a result, the temporary connection between the printer 100 and the terminal 10 is disconnected.

(Continuation of Figure 6; Figure 7)
The terminal 10 activates the camera 18 at T190. Then, at T192, the terminal 10 receives an operation to photograph the QR code Q1 with the camera 18 from the user. The terminal 10 decodes the photographed QR code at T194. As a result, the terminal 10 acquires BS information (ie, public key PKpr, MAC address MA, and channel information CI) (S35). The process at T194 corresponds to bootstrapping in the DPP method.

At T200, the terminal 10 establishes a Wi-Fi connection with the AP 6A using the AP information (ie, SSID "S1", PW "P1") acquired at T130 in FIG. 5 (S38).

When a Wi-Fi connection is established between the terminal 10 and the AP 6A, the terminal 10 sends the MAC address MA included in the BS information as the destination and uses the public key PKpr included in the BS information at T210. The Auth Request is sent to the printer 100 (S40). Here, the terminal 10 repeatedly uses one or more channels indicated by the channel information CI included in the BS information to repeatedly transmit the Auth Request to the printer 100. In this way, since the terminal 10 transmits the Auth Request using a channel that can be used by the printer 100, the Auth Request can be properly received by the printer 100.

Auth Req is a signal requesting execution of authentication of the terminal 10 of the transmission source. Specifically, the terminal 10 first generates a shared key using the private key of the terminal 10 (not shown) and the public key PKpr of the printer 100, and encrypts a random value using the shared key. Generate encrypted data by Then, the terminal 10 transmits an Auth Req including the public key of the terminal 10 (not shown), the encrypted data, and the capability of the terminal 10 to the printer 100. Capability of the terminal 10 includes a value indicating that it can operate only as a DPP configurator.

When the printer 100 receives the Auth Req from the terminal 10 via the first I/F 116A at T210 (S110), it performs authentication of the encrypted data included in the Auth Req (S110). Specifically, the printer 100 generates a shared key using the public key of the terminal 10 and the private key of the printer 100 (not shown) included in the Auth Req, and uses the shared key to encrypt the data. Decrypt. If the decryption of the encrypted data is successful, the printer 100 determines that the authentication has been successful, and executes the processes from T212 onwards.

At T212, the printer 100 transmits Auth Res including the capability of the printer 100 to the terminal 10 via the first I/F 116A (S110). Capability of the printer 100 includes a value indicating that it can operate only as a DPP Enrollee.

The terminal 10 receives Auth Res from the printer 100 at T212 (S40). This ends the DPP Auth.

At T214, the printer 100 transmits the Configuration Req to the terminal 10 via the first I/F 116A (S110). In the following, Configuration will be referred to as "Config". Config Req is a signal requesting transmission of a printer CO.

When the terminal 10 receives the Config Req from the printer 100 at T214, it generates a CO for the printer (S40). Specifically, the terminal 10 first generates a printer Signed Connector (hereinafter referred to as "SC"), which is information to be used by the printer 100 to establish a Wi-Fi connection with the AP 6A. .
The printer SC includes, for example, AP information of AP6A (ie, SSID "S1" and PW "P1"). Then, the terminal 10 generates a printer CO including the printer SC, and transmits Config Res including the printer CO to the printer 100 at T216 (S40).

When the printer 100 receives the Config Res including the printer CO from the terminal 10 via the first I/F 116A at T216 (S110), the printer 100 stores the printer CO included in the Config Res in the memory of the printer 100 at T218. 134 (S110). This completes the DPP configuration.

At T220, the printer 100 establishes a Wi-Fi connection with the AP 6A via the first I/F 116A by executing DPP-based Network Access with the AP 6A (S110). In Network Access, various communications are executed between the printer 100 and the AP 6A, and in the process of these communications, the SSID "S1" and PW "P1" included in the printer CO stored in T218 are used. Ru. This ends the DPP-based Network Access.

As shown in case A above, when a Wi-Fi connection is established between the printer 100 and the AP 6A, both the terminal 10 and the printer 100 establish a Wi-Fi connection with the AP 6A. Constructed. In this case, the terminal 10 can transmit print data representing the image to be printed to the printer 100 via the AP 6A. The printer 100 can then print the image represented by the print data.

(Case B-2; Figure 8)
Next, with reference to FIG. 8, a case B-2 will be described in which a Wi-Fi connection according to the normal Wi-Fi method is established between the printer 100 and the AP 6B using a temporary connection. FIG. 8 is a continuation of FIG. 5.

In FIG. 8, first, processing similar to T150 to T170 in FIG. 6 is executed. At T272, the terminal 10 receives a selection of SSID "S2" included in the connection selection screen SC1 from the user (S24). The terminal 10 determines that the selected SSID "S2" does not match the SSID included in the AP information acquired at T130 (NO at S30). In this case, the terminal 10 displays the input screen SC2 at T274 (S50). The input screen SC2 includes the SSID "S2" selected in T272, a password input area, an OK button, and a cancel button. At T276, the terminal 10 receives the input of the PW "P2" of the AP 6B identified by the SSID "S2" from the user, and at T278 receives the selection of the OK button (S52). In this case, at T280, the terminal 10 uses the temporary connection to transmit a connection instruction including the SSID "S2" and PW "P2" to the printer 100 (S60).

At T280, the printer 100 uses the temporary connection to receive a connection instruction including the SSID "S2" and PW "P2" from the terminal 10 via the second I/F 116B (NO at S102). In this case, at T282, the printer 100 establishes a Wi-Fi connection with the AP 6B using the SSID "S2" and PW "P2" included in the connection instruction (S130).

The terminal 10 sends a connection instruction using the temporary connection at T280, and then sends a disconnection request to the printer 100 using the temporary connection at T284.

When the printer 100 receives a disconnection request from the terminal 10 via the second I/F 116B using the temporary connection at T286, it stops SoftAP at T290. As a result, the temporary connection between the printer 100 and the terminal 10 is disconnected.

(Case B-3; Figure 9)

Next, with reference to FIG. 9, another case B-3 will be described in which a Wi-Fi connection according to the normal Wi-Fi method is established between the printer 100 and the AP 6B using a temporary connection. . FIG. 9 is a continuation of FIG. 5.

At T350, the printer 100 broadcasts a probe request via the first I/F 116A (S100). In this case, the Probe request does not reach AP6A, but reaches AP6B. Therefore, the printer 100 receives the Probe response only from the AP 6B (S100).

The processing from T360 to T362 is similar to the processing from T160 to T162 in FIG. However, in this case, the inquiry response includes only one SSID "S2".

When the terminal 10 receives the inquiry response from the printer 100 using the temporary connection at T362 (YES at S20), the terminal 10 displays the connection selection screen SC3 at T370 (S22). The connection selection screen SC3 includes only one SSID "S2".

At T372, the terminal 10 receives a selection of SSID "S2" included in the connection selection screen SC3 from the user (NO at S30). Thereafter, processing similar to T274 to T290 in FIG. 8 is executed. As a result, a Wi-Fi connection according to the normal Wi-Fi method is established between the printer 100 and the AP 6B (S130).

As shown in case B-3, when the SSID "S2" that identifies AP6B is selected from two or more SSIDs "S1" and "S2", the terminal 10 selects the SSID "S2" of the AP6B. and a connection instruction including the password "PW2" to the printer 100 (see T280 in FIG. 8 cited in FIG. 9). For this purpose, the terminal 10 can appropriately establish a Wi-Fi connection between the printer 100 and the AP 6B.

(Case C; Figure 10)
Next, with reference to FIG. 10, case C in which the printer 200 is used instead of the printer 100 will be described. Printer 200 does not support the DPP method.

In FIG. 10, the same processes as T102 in FIG. 5 to T154 in FIG. 6 are executed between the devices 200, 10, and 6A. Then, at T460, the terminal 10 uses the temporary connection to transmit an inquiry request to the printer 200 (S16).

The processing at T460 and T462 is similar to the processing at T160 and T162 in FIG. However, the processes T460 and T462 are executed by the printer 200. Further, the inquiry response includes non-support information indicating that the printer 200 does not support the DPP method, and various information about the printer 200 (ie, printer ID "BBB", capability information).

When the terminal 10 receives the inquiry response from the printer 200 using the temporary connection at T462, it displays the connection selection screen SC4 at T470 (S22). The connection selection screen SC4 includes a printer ID "BBB" of the printer 200, capability information of the printer 200, and two SSIDs "S1" and "S2".

At T472, the terminal 10 receives a selection of SSID "S1" included in the connection selection screen SC4 from the user (S24). The terminal 10 determines that the selected SSID "S1" matches the SSID included in the AP information acquired in T130 (YES in S30), and determines that the inquiry response received in S462 does not include DPP support information. Determine (NO in S32). In this case, the terminal 10 displays the input screen SC5 at T474 (S50). The input screen SC5 includes the SSID "S1" selected in T472, a password input area, an OK button, and a cancel button.

The processes from T476 to T490 that are executed thereafter are the same as those from T276 to T290 in FIG. However, at T476, the PW "P1" of the AP 6A is input, and at T480, a connection instruction including the SSID "S1" and PW "P1" is transmitted. As a result, a Wi-Fi connection is established between the printer 200 and the AP 6A.

(Effects of this example)
In this embodiment, when accepting a Wi-Fi button operation from the user (T4 in FIG. 4), the printer 100 establishes a temporary connection with the terminal 10 (T144 in FIG. 5), and uses the temporary connection to 10 (T180 in FIG. 6), and outputs the QR code Q1 obtained using the public key PKpr of the printer 100 (T184 in FIG. 6). Thereby, the printer 100 can establish a Wi-Fi connection with the AP 6A according to the DPP method (T220 in FIG. 7). Further, when the printer 100 uses a temporary connection to receive from the terminal 10 not a DPP execution request but a connection instruction according to a normal Wi-Fi method different from the DPP method (T280 in FIG. 8, 9, T480 in FIG. 10), it is possible to establish a Wi-Fi connection with the AP6B using SSID "S2" and PW "P2" included in the connection instruction (T282 in FIG. 8). , T282 cited in FIG. 9, T482 in FIG. 10). In this way, the printer 100 can appropriately establish a Wi-Fi connection with the AP depending on whether it receives a DPP execution request or a connection instruction from the terminal 10.

Further, when the printer 100 receives a Probe response including information indicating that WPS is being executed from the AP 6A via the first I/F 116A (T12 in FIG. 4), the printer 100 establishes a Wi-Fi connection with the AP 6A according to the WPS method. A connection is established (T14). On the other hand, when the printer 100 receives a Probe request from the terminal 10 via the second I/F 116B (T140 in FIG. 5), the printer 100 establishes a temporary connection with the terminal 10 (T144). A DPP execution request is received from the terminal 10 (T180 in FIG. 6). Thereafter, the printer 100 communicates with the terminal 10 according to the DPP method via the first I/F 116A, and establishes a Wi-Fi connection with the AP 6A according to the DPP method. In this way, since the printer 100 switches between the first I/F 116A and the second I/F 116B depending on the purpose of communication, it is difficult to properly establish a Wi-Fi connection with the AP 6A. can.

Furthermore, in this embodiment, the terminal 10 establishes a temporary connection with the printer 100 (T144 in FIG. 5). If YES in S30 in FIG. 2 and YES in S32, the terminal 10 sends a DPP execution request using the temporary connection (T180 in FIG. 6), and uses the public key PKpr of the printer 100. The obtained QR code Q1 is output to the printer (T184 in FIG. 6). The terminal 10 acquires the public key PKpr by photographing the QR code Q1 (T194 in FIG. 7), sends the Authe Req using the public key PKpr to the printer 100 (T210 in FIG. 7), and sends the printer CO is transmitted to the printer 100 (T216 in FIG. 7). Thereby, a Wi-Fi connection can be established between the printer 100 and the AP 6A (T220 in FIG. 7). On the other hand, if NO in S30 or NO in S32 in FIG. 2, the terminal 10 uses the temporary connection to issue a connection instruction to the printer 100 or 200 (T280 in FIG. 8, T280 cited in FIG. 9, T480 in FIG. 10). Thereby, a Wi-Fi connection can be established between the printer 100 or 200 and the AP 6B. (T282 in FIG. 8, T282 cited in FIG. 9, T482 in FIG. 10). In this way, the terminal 10 switches whether to send a DPP execution request to the printer 100 or 200 or a connection instruction to the printer 100 or 200, depending on the determinations in S30 and S32. A Wi-Fi connection can be appropriately established with 6B.

For example, a comparative example is assumed in which when the printer 100 receives a DPP execution request, the printer 100 uses a temporary connection to transmit BS information to the terminal 10 without displaying the QR code Q1. In such a comparative example, for example, the timing when a user of the terminal 10 performs a Wi-Fi button operation on the printer 100 and the timing when a user of another terminal performs a Wi-Fi button operation on another printer existing near the printer 100 are determined. Assume a situation where the execution timing and the execution timing are almost the same. In this case, the terminal 10 simultaneously establishes a temporary connection with the printer 100 and each of the other printers mentioned above, and simultaneously receives BS information from the printer 100 and each of the other printers mentioned above. In this case, the terminal 10 cannot recognize whether to communicate with the printer 100 or the other printer mentioned above according to the DPP method. As a result, there is a possibility that the terminal 10 mistakenly performs communication according to the DPP method with the other printers mentioned above. That is, there is a possibility that the terminal 10 may erroneously establish a Wi-Fi connection between the other printer mentioned above and the AP 6A. In contrast, in this embodiment, the terminal 10 acquires the BS information of the printer 100 in response to the user of the terminal 10 reading the QR code Q1 displayed on the printer 100 (T192 in FIG. 7). T194), and communication according to the DPP method can be appropriately executed with the printer 100 (T210 to T216). As a result, the terminal 10 can appropriately establish a Wi-Fi connection between the printer 100 and the AP 6A.

For the printer 100 that supports the DPP method, the terminal 10 performs various communications according to the DPP method with the printer 100 (T210 to T216 in FIG. 7), so that the DPP method is established between the printer 100 and the AP 6A. A Wi-Fi connection can be established according to the following. Furthermore, for the printer 200 that does not support the DPP method, the terminal 10 establishes a Wi-Fi connection between the printer 200 and the AP 6A by transmitting a connection instruction to the printer 200 (T480 in FIG. 10). be able to. In this way, the terminal 10 can appropriately establish a Wi-Fi connection with the AP 6A for both the printer 100 that supports the DPP method and the printer 200 that does not support the DPP method.

Here, the restrictions of the OS 36 will be explained. When the terminal 10 has established a Wi-Fi connection with the AP 6A via the first I/F 16A (T200 in FIG. 7), the OS 36 executes communication with the printer 100 according to the DPP method. , a printer CO for establishing a Wi-Fi connection with the AP 6A can be sent to the printer 100 (T216). On the other hand, if the terminal 10 has not established a Wi-Fi connection with the AP 6A, the OS 36 cannot send the printer CO for establishing a Wi-Fi connection with the AP 6A to the printer 100. Due to the existence of such restrictions on the OS 36, in this embodiment, the terminal 10 uses the temporary connection to acquire BS information from the printer 100 (T194), and then disconnects the temporary connection (T186, T188). , re-establishes a Wi-Fi connection with AP6A (T200). Therefore, the terminal 10 can appropriately transmit the printer CO to the printer 100 while establishing the Wi-Fi connection with the AP 6A (T216). As a result, a Wi-Fi connection can be appropriately established between the AP 6A and the printer 100.

(correspondence)
The correspondence relationship regarding "communication device" is as follows. The printer 100, the display section 114, the Wi-Fi I/F 116, and the terminal 10 are examples of a "communication device,""outputsection,""wirelessinterface," and "terminal device," respectively. The Wi-Fi button operation is an example of the "first predetermined operation." AP6A and AP6B are examples of a "first access point" and a "second access point", respectively. SSID "S1" and "S2" are examples of "first SSID" and "second SSID", respectively. The QR code Q1, the public key PKpr of the printer 100, and the Auth Req are examples of a "specific image,""bootstrappingkey," and "authentication request," respectively. The Wi-Fi connection at T144 in FIG. 5, the Wi-Fi connection at T220 in FIG. 7, and the Wi-Fi connection at T282 in FIG. 8 are respectively "first wireless connection", "second wireless connection", and " This is an example of the third wireless connection. The SSID "S2", PW "P2", and MAC address MA of the printer CO and AP6B are examples of "first connection information", "second connection information", and "identification information", respectively.

The processing at T144 in FIG. 5, the processing at T220 in FIG. 7, and the processing at T282 in FIG. 8 are executed by the "first establishment section," "second establishment section," and "third establishment section," respectively. This is an example of processing. The processes at T180 and T184 in FIG. 6 are examples of processes executed by the "output request receiving unit" and the "output control unit", respectively. The processes T210 and T216 in FIG. 7 and T280 in FIG. 8 are examples of processes executed by the "authentication request receiving section", "first connection information receiving section", and "second connection information receiving section", respectively. It is. The process at T162 in FIG. 6 is an example of the process executed by the "SSID transmitter" and the "device information transmitter". The processes T180, T181, and T182 in FIG. 6 are examples of processes executed by the "DPP execution request receiving unit," the "first migration unit," and the "generation unit," respectively. The process at T6 in FIG. 4 is an example of the process executed by the "second transition unit."

The correspondence relationship regarding "terminal device" is as follows. The Wi-Fi I/F 16 and the CPU 32 are examples of a "wireless interface" and a "computer", respectively. The setup operation is an example of the "first predetermined operation." The Wi-Fi connection of T200 in FIG. 7 is an example of the "fourth wireless connection." DPP support information is an example of "availability information." The fact that the selected SSID and the target SSID match (YES in S30) is an example of "the predetermined condition being satisfied".

The processes of S14, S34, S35, and S38 in FIG. 2 are examples of processes executed by the "first establishment unit," "output request transmission unit," "acquisition unit," and "second establishment unit," respectively. It is. The processes at T210 and T216 in FIG. 7 are examples of processes executed by the "authentication request transmitter" and the "first connection information transmitter", respectively. The process of S60 in FIG. 2 is an example of the process executed by the "second connection information transmitter". The process of S12 in FIG. 2 is an example of the process executed by the "cutting unit". The process at T170 in FIG. 6 is an example of the process executed by the "first display control unit" and the "second display control unit". The process at T162 in FIG. 6 is an example of the process executed by the "SSID receiving unit", the "approval information receiving unit", and the "device information receiving unit".

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

(Modification 1) Instead of displaying the QR code Q1 on the display unit 114 at T184 in FIG. 6, the printer 100 may, for example, cause the print execution unit 118 to print the QR code Q1. In this modification, the print execution section 118 is an example of an "output section."

(Modification 2) The Wi-Fi I/F 116 of the printer 100 may support the WFD method. In this case, instead of activating SoftAP in S80 of FIG. 3, the printer 100 may transition to a WFD-based Group Owner state. In this modification, the Group Owner is an example of a "master station."

(Modification 3) The printer 100 operating as a SoftAP may be able to establish a Wi-Fi connection with the terminal 10 without using the password "P3". In this case, the application 38 of the terminal 10 does not need to store the SSID "S3" and password "P3" of the printer 100 in advance. In this modification, when the terminal 10 receives a Probe response including the SSID "S3" from the printer 100 at T142 in FIG. 5, the terminal 10 establishes a Wi-Fi connection with the printer 100 at T144 without performing password authentication. may be established.

(Modification 4) The printer 100 does not need to execute the processes from T150 to T154 in FIG. 6. In this case, the inquiry response at T162 does not include the SSID. Therefore, the process at T170 is also not executed. In this modification, the "SSID transmitter" and the "SSID receiver" can be omitted.

(Variation 5) The printer 100 may store the public key PKpr in advance from the time the printer 100 is shipped. In this modification, the "generation unit" can be omitted.

(Variation 6) The public key PKpr does not need to be information obtained using the MAC address MA of the printer 100, but may be information obtained using the serial number, printer ID, etc. of the printer 100, for example. . That is, the "identification information" may be any information for identifying the printer 100. In another modification, the public key PKpr does not have to be information obtained using the identification information of the printer 100.

(Modification 7) The printer 100 may always operate in the DPPON state. In this modification, the "DPP execution request transmitting section," the "DPP execution request receiving section," and the "first transition section" can be omitted.

(Modification 8) The printer 100 may generate the QR code Q1 at T184 in FIG. 6 without using the channel information CI. In that case, for example, the printer 100 may transmit the channel information CI to the terminal 10 at T162.

(Modification 9) At T162 in FIG. 6, the printer 100 may transmit an inquiry response that does not include the printer ID "AAA" and capability information to the terminal 10. In this modification, the "device information receiving section," the "second display control section," and the "device information transmitting section" can be omitted.

(Modification 10) The printer 100 may always operate as a master station (ie, Soft AP) of the Wi-Fi network. In this modification, the "second transition part" can be omitted.

(Modification 11) If the above-described restrictions of the OS 36 do not exist, the terminal 10 does not need to establish a Wi-Fi connection with the AP 6A at T200 in FIG. In this case, in this modification, the "second establishment section" of the "application program" can be omitted.

(Modification 12) In the initial state of FIG. 5, the terminal 10 does not need to establish a Wi-Fi connection with the AP 6A. In this case, the process at T132 can be omitted. In this modification, the "cutting section" can be omitted.

(Modification 13) At T162 in FIG. 6, the printer 100 may transmit to the terminal 10 an inquiry response that does not include information indicating that the printer 100 supports the DPP method. In this case, the process of S32 in FIG. 2 can be omitted, and if YES in S30, the process advances to S34. In this modification, the "approval information receiving section" can be omitted.

(Modification 14) In each of the above embodiments, each of the processes shown in FIGS. 2 to 10 is realized by software (for example, the application 38, the program 136), but at least one of these processes is realized by hardware such as a logic circuit. It may be realized by

Further, the technical elements described in this specification or the drawings exhibit technical usefulness singly or in various combinations, and are not limited to the combinations described in the claims as filed. Furthermore, the techniques illustrated in this specification or the drawings simultaneously achieve multiple objectives, and achieving one of the objectives has technical utility in itself.

2: Communication system, 10: Terminal, 12, 112: Operation unit, 14, 114: Display unit, 16, 116: Wi-Fi interface, 18: Camera, 16A, 116A: First I/F, 16B, 116B : 2nd I/F, 30, 130: Control unit, 32, 132: CPU, 34, 134: Memory, 36: OS program, 38: Application, 61, 62: WPS button, 100, 200: Printer, 113 : Wi-Fi button, 118: Print execution section, 136: Program

Claims (20)

A communication device,
an output section;
a wireless interface for performing wireless communication according to the Wi-Fi standard;
a first establishing unit that establishes a first wireless connection with a terminal device via the wireless interface when a first predetermined operation is accepted from a user; the first establishment unit, which is a connection for the device to operate as a master station and the terminal device to operate as a slave station;
an output request that uses the first wireless connection to receive an output request from the terminal device via the wireless interface requesting output of a specific image obtained using a bootstrapping key of the communication device; a receiving section;
an output control unit that causes the output unit to output the specific image when the output request is received from the terminal device;
After the specific image is output, an authentication request is made from the terminal device via the wireless interface in accordance with the DPP (Device Provisioning Protocol) method of the Wi-Fi standard, and the bootstrapping key is an authentication request receiving unit that receives the used authentication request;
a first connection information receiving unit that receives first connection information according to the DPP method from the terminal device via the wireless interface when the authentication request is received from the terminal device;
a second wireless connection established with the first access point via the wireless interface using the first connection information when the first connection information is received from the terminal device; 2, an establishment part;
a second connection information receiving unit that uses the first wireless connection to receive second connection information according to a method different from the DPP method from the terminal device via the wireless interface;
a third wireless connection established with a second access point via the wireless interface using the second connection information when the second connection information is received from the terminal device; 3 establishment part;
A communication device comprising: The communication device further includes:
one or more SSIDs (Service Set Identifier) that identify one or more access points with which the communication device can establish a wireless connection via the wireless interface using the first wireless connection; comprising an SSID transmitter that transmits to the terminal device,
The authentication request receiving unit is configured to determine that the one or more SSIDs are first SSIDs included in access point information stored in the terminal device, and that the first SSID identifies the first access point. receiving the authentication request from the terminal device if it includes an SSID;
The second connection information receiving unit receives the second connection information from the terminal device when the one or more SSIDs do not include the first SSID.
The communication device according to claim 1. The SSID transmitter transmits to the terminal device two or more SSIDs that identify two or more access points with which the communication device can establish a wireless connection,
The authentication request receiving unit is configured such that the two or more SSIDs include the first SSID, and
receiving the authentication request from the terminal device when the first SSID is selected by the user from the two or more SSIDs displayed on the terminal device;
The authentication request receiving unit is configured such that the two or more SSIDs include the first SSID, and
receiving the second connection information from the terminal device when the user selects a second SSID that identifies the second access point from the two or more SSIDs displayed on the terminal device; ,
The communication device according to claim 2. The communication device further comprises a generation unit that generates the bootstrapping key of the communication device when the first wireless connection is established with the terminal device. Communication devices as described in Section. The communication device according to any one of claims 1 to 4, wherein the bootstrapping key is information obtained using identification information of the communication device. The communication device further includes:
a first transition unit that transitions a state of the communication device from a non-responsive state to a responsive state when the output request is received from the terminal device, the non-responsive state being a state in which the communication device is in the authentication mode; The communication device is in a state in which it is not possible to transmit an authentication response to the request, and the response state is in a state in which the communication device is in a state in which it is possible to transmit the authentication response.
The communication device according to any one of claims 1 to 5. The specific image is an image obtained using channel information indicating one or more wireless channels that can be used by the communication device,
The authentication request receiving unit receives the authentication request from the terminal device using one of the one or more wireless channels indicated by the channel information.
The communication device according to any one of claims 1 to 6. The communication device further includes:
a device information transmitter that transmits device information related to the communication device to the terminal device via the wireless interface using the first wireless connection, the device information being received by the terminal device; the device information transmitting section, the device information being displayed on a display section of the terminal device in response to the device information being sent to the terminal device;
A communication device according to any one of claims 1 to 7. The communication device further includes:
a second transition unit that transitions the state of the communication device from a non-master station state in which it does not operate as the master station to a master station state in which it operates as the master station when a second predetermined operation from the user is accepted; Prepare,
The first establishment unit establishes the first wireless connection with the terminal device after the state of the communication device is transitioned to the master station state.
The communication device according to any one of claims 1 to 8. A computer program for a communication device, the computer program comprising:
The communication device includes:
an output section;
a wireless interface for performing wireless communication according to the Wi-Fi standard;
comprising a computer;
The computer program causes the computer to run the following parts:
a first establishing unit that establishes a first wireless connection with a terminal device via the wireless interface when a first predetermined operation is accepted from a user; the first establishment unit, which is a connection for the device to operate as a master station and the terminal device to operate as a slave station;
an output request that uses the first wireless connection to receive an output request from the terminal device via the wireless interface requesting output of a specific image obtained using a bootstrapping key of the communication device; a receiving section;
an output control unit that causes the output unit to output the specific image when the output request is received from the terminal device;
After the specific image is output, an authentication request is made from the terminal device via the wireless interface in accordance with the DPP (Device Provisioning Protocol) method of the Wi-Fi standard, and the bootstrapping key is an authentication request receiving unit that receives the used authentication request;
a first connection information receiving unit that receives first connection information according to the DPP method from the terminal device via the wireless interface when the authentication request is received from the terminal device;
a second wireless connection established with the first access point via the wireless interface using the first connection information when the first connection information is received from the terminal device; 2, an establishment part;
a second connection information receiving unit that uses the first wireless connection to receive second connection information according to a method different from the DPP method from the terminal device via the wireless interface;
a third wireless connection established with a second access point via the wireless interface using the second connection information when the second connection information is received from the terminal device; 3 establishment part;
A computer program that functions as An application program for a terminal device,
The terminal device is
a wireless interface for performing wireless communication in accordance with the Wi-Fi standard;
camera and
comprising a computer;
The application program causes the computer to run through the following parts:
a first establishing unit that establishes a first wireless connection with a communication device via the wireless interface, wherein the first wireless connection is configured such that the communication device operates as a master station and the terminal device operates as a slave station; the first establishment unit, which is a connection for operating as a station;
an output request transmitting unit that transmits an output request via the wireless interface using the first wireless connection when a predetermined condition is satisfied, the output request transmitting the output request to a boot boot controller of the communication device; the output request transmitter, which is a request for causing the output unit of the communication device to output a specific image obtained using a wrapping key;
If the specific image is output by the communication device in response to the output request being sent to the communication device, and the specific image is captured by the camera, the bootstrapping key is obtained. an acquisition department;
When the bootstrapping key is acquired, an authentication request is made via the wireless interface according to the DPP (Device Provisioning Protocol) method of the Wi-Fi standard, and the bootstrapping key is used. an authentication request transmitter that transmits the authentication request to the communication device;
A first connection information transmitting unit that transmits first connection information according to the DPP method to the communication device via the wireless interface when the authentication request is transmitted to the communication device, the first connection information transmitter, wherein the first connection information is information for establishing a second wireless connection between the communication device and the first access point;
If the predetermined condition is not met, the first wireless connection is used to transmit second connection information according to a method different from the DPP method to the communication device via the wireless interface. 2, wherein the second connection information is information for establishing a third wireless connection between the communication device and the second access point; an information transmission section;
An application program that functions as The terminal device further includes:
A memory for storing access point information, the access point information being information for establishing a fourth wireless connection with the first access point,
The application program further causes the computer to
When the first wireless connection is disconnected after the specific image is output to the communication device, the access point information in the memory is used to connect the fourth wireless connection via the wireless interface. a second establishment unit that establishes a wireless connection with the first access point;
The authentication request transmitter transmits the authentication request to the communication device when the fourth wireless connection is established with the first access point.
The application program according to claim 11. The application program further causes the computer to
functioning as a disconnection unit that disconnects the fourth wireless connection when a first predetermined operation is accepted from the user in a state where the fourth wireless connection is established with the first access point;
The first establishment unit establishes the first wireless connection with the communication device after the fourth wireless connection is disconnected.
The application program according to claim 12. The access point information includes a first SSID (abbreviation for Service Set Identifier) that identifies the first access point,
The application program further causes the computer to
utilizing the first wireless connection to receive from the communication device via the wireless interface one or more SSIDs identifying one or more access points with which the communication device can establish a wireless connection; Function as an SSID receiving section,
If the one or more SSIDs include the first SSID included in the access point information in the memory, the predetermined condition is satisfied;
the predetermined condition is not satisfied if the one or more SSIDs do not include the first SSID;
The application program according to claim 12 or 13. The terminal device further includes a display section,
The SSID receiving unit receives two or more SSIDs that identify two or more access points with which the communication device can establish a wireless connection,
The application program further causes the computer to
Functioning as a first display control unit that causes the two or more SSIDs to be displayed on the display unit,
The predetermined condition is satisfied when the two or more SSIDs include the first SSID and the first SSID is selected by the user from the two or more SSIDs displayed on the display unit. is,
The two or more SSIDs include the first SSID, and a second SSID for identifying the second access point is selected by the user from the two or more SSIDs displayed on the display unit. If the predetermined condition is not met,
The application program according to claim 14. The application program according to any one of claims 11 to 15, wherein the bootstrapping key is information obtained using identification information of the communication device. The output request is further a request for shifting the state of the communication device from a non-response state to a response state, and the non-response state is a state in which the communication device is unable to send an authentication response to the authentication request. and
The response state is a state in which the communication device is capable of transmitting the authentication response.
The application program according to any one of claims 11 to 16. The acquisition unit further includes channel information indicating one or more channels available to the communication device when the specific image is output by the communication device and the specific image is captured by the camera. Acquired,
The authentication request transmitter transmits the authentication request to the communication device using one of the one or more wireless channels indicated by the channel information.
The application program according to any one of claims 11 to 17. The terminal device further includes a display section,
The application program further causes the computer to
a device information receiving unit that receives device information related to the communication device from the communication device via the wireless interface using the first wireless connection;
a second display control unit that causes the device information to be displayed on the display unit;
to function as
The application program according to any one of claims 11 to 18. The application program further causes the computer to
a capability information receiving unit that receives capability information indicating whether or not the communication device supports the DPP method from the communication device via the wireless interface using the first wireless connection; make it work,
If the availability information indicates that the communication device supports the DPP method, the predetermined condition is satisfied;
If the availability information does not indicate that the communication device supports the DPP method, the predetermined condition is not satisfied;
The application program according to any one of claims 11 to 19.

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