JP7363286B2 - Communication system, first server, second server, computer program for the first server, and computer program for the second server - Google Patents

Description

This specification discloses a technology related to a server that mediates communication between a terminal device and a communication device.

Patent Document 1 discloses a technique for transmitting print data from a server to a printer and causing the printer to execute printing. An XMPP (eXtensible Messaging and Presence Protocol) connection is established between the server and the printer. When the server receives an e-mail as a print request from the terminal, it generates print data and sends print waiting information to the printer using the XMPP connection. The printer that has received the print waiting information requests print data from the server and receives the print data from the server. Thereby, the printer executes printing based on the print data.

Here, for example, when the printer's power is cut off, the XMPP connection is cut off. When the XMPP connection is disconnected, the transmission of print waiting information fails, and the server transmits error information to the terminal. Thereafter, when the printer is powered on again, the printer re-establishes an XMPP connection with the server and requests print data from the server. This allows the printer to receive print data generated by the server and execute printing while the power is turned off.

Japanese Patent Application Publication No. 2015-111424

With the above-mentioned technique, the printer can request print data from the server when the power is turned on again, even if no print data is generated on the server while the power is turned off. That is, unnecessary communication may be performed between the printer and the server.

This specification provides a technique for suppressing unnecessary communication between a communication device and a server.

A communication system disclosed herein includes a communication device, a first server, and a second server, and the second server is configured to receive first data from a terminal device. , a first related information transmitter that transmits first related information related to the first data to the first server, the first server transmits information from the second server to the first related information. When related information is received, an attempt is made to transmit first instruction information corresponding to the first related information to the communication device using a session for performing server push type communication. failure when the transmission of the first instruction information to the communication device fails due to the session not being established between the trial unit, the communication device, and the first server; a failure information transmitter that transmits information to the second server,
The second server further transmits acquisition information for acquiring second related information related to the first data to the first server when the failure information is received from the first server. The first server further includes an acquisition information transmitting unit that transmits the acquisition information to the server, and the first server further transmits the session between the communication device and the first server after the acquisition information is received from the second server. an acquisition unit that uses the acquisition information to acquire the second related information when the acquisition information is established; and an acquisition unit that uses the session to acquire the second related information when the second related information is acquired; an instruction information transmitter configured to transmit second instruction information corresponding to related information of No. 2 to the communication device, and the communication device is configured to: a device-side transmitter that transmits the second related information corresponding to the second instruction information to the second server, and the second server further transmits the second related information from the communication device. The communication device further includes a data transmitter configured to transmit second data obtained using the first data related to the second related information to the communication device when the communication device receives the second related information.

According to the above configuration, after the transmission of the first instruction information to the communication device fails due to a session not being established between the communication device and the first server, the communication device and the first server When a session is established with one server, the second instruction information is sent from the first server to the communication device even if the communication device does not send a request to the first server. Thereby, the communication device transmits second related information corresponding to the second instruction information to the second server, and receives second data obtained using the first data from the second server. can do. In this way, when a session is established after a failure in transmission of the first instruction information, no request is sent from the communication device to the first server, resulting in unnecessary communication between the communication device and the first server. can be prevented from being executed.

Further, the first server disclosed in this specification is configured to receive first data related to the first data from the second server when the second server receives the first data from the terminal device. a first related information receiving unit that receives related information from the second server, and a session for executing server push type communication when the first related information is received from the second server; a trial unit that attempts to transmit first instruction information corresponding to the first related information to a communication device, and the session is not established between the communication device and the first server; a failure information transmitter that transmits failure information to the second server when transmission of the first instruction information to the communication device fails; an acquisition information receiving unit that receives acquisition information for acquiring second related information related to the first data from the second server when the second data is transmitted; an acquisition unit that acquires the second related information using the acquired information when the session is established between the communication device and the first server after the information is received; an instruction information transmitting unit that transmits second instruction information corresponding to the second related information to the communication device using the session when the second related information is acquired; When the second instruction information is received from the first server, the communication device transmits the second related information corresponding to the second instruction information to the second server, and When the second related information is received from the communication device, the second server transmits second data obtained using the first data related to the second related information to the communication device. and the instruction information transmitting section that transmits the instruction information.

According to the above configuration, the first server fails to send the first instruction information to the communication device because a session is not established between the communication device and the first server. Later, when a session is established between the communication device and the first server, the second instruction information is sent to the communication device even if no request is sent from the communication device to the first server. When a session is established after the transmission of the first instruction information fails, a request is not sent from the communication device to the first server, so useless communication is performed between the communication device and the first server. This can be suppressed.

A second server disclosed herein is configured to transmit first related information related to the first data to the first server when the first data is received from the terminal device. , the first server is configured to use a session for executing server push type communication when the first related information is received from the second server. , between the first related information transmitting unit that attempts to transmit first instruction information corresponding to the first related information to the communication device, and the communication device and the first server. a failure information receiving unit that receives failure information from the first server when transmission of the first instruction information to the communication device fails due to a session not being established; an acquisition information transmitting unit that transmits acquisition information for acquiring second related information related to the first data to the first server when the failure information is received from the first server; , the first server uses the acquired information when the session is established between the communication device and the first server after the acquired information is received from the second server. and obtains the second related information, and when the second related information is obtained, the first server uses the session to obtain the second related information corresponding to the second related information. 2 instruction information to the communication device, and the communication device transmits the second association corresponding to the second instruction information when the second instruction information is received from the first server. the acquisition information transmitter that transmits information to the second server; and when the second related information is received from the communication device, the first data related to the second related information is transmitted to the second server. and a data transmitter that transmits second data obtained using the communication device to the communication device.

According to the above configuration, the second server fails to send the first instruction information to the communication device because a session is not established between the communication device and the first server. If so, the acquired information is sent to the first server. This allows the first server to use the obtained information when a session is established between the communication device and the first server after the transmission of the first instruction information to the communication device fails. , the second related information can be acquired, and second instruction information corresponding to the second related information can be transmitted to the communication device. That is, even if a request is not sent from the communication device to the first server, the second instruction information is sent from the first server to the communication device. When a session is established after the transmission of the first instruction information fails, a request is not sent from the communication device to the first server, so useless communication is performed between the communication device and the first server. This can be suppressed.

A control method, a computer program, and a computer-readable recording medium that stores the computer program for realizing the first server and the second server described above are also new and useful.

The configuration of the communication system is shown. A block diagram showing the configuration of each device in the communication system is shown. A sequence diagram of setup processing is shown. A continuation of FIG. 3 is shown. A sequence diagram of processing for executing email printing is shown. A specific case where an XMPP session is not established is shown. A sequence diagram of processing for executing application printing according to a second embodiment is shown.

(First example)
(Configuration of communication system 2: Figure 1)
As shown in FIG. 1, the communication system 2 includes an XMPP (abbreviation for Extensible Messaging and Presence Protocol) server 10, an APP server 100, a multi-function device 200, and a terminal device 300. Note that hereinafter, the multi-function device will be referred to as "MFP (abbreviation for Multi-Function Peripheral)".

The XMPP server 10, the APP server 100, and the terminal device 300 are connected to the Internet 8. The XMPP server 10 can communicate with each device 100, 300 via the Internet 8. Furthermore, the MFP 200 is connected to a LAN (Local Area Network) 4. LAN 4 is connected to the Internet 8. MFP 200 can communicate with each device 10 , 100 , 300 via LAN 4 and Internet 8 . Note that the LAN 4 may be a wired LAN or a wireless LAN.

(Configuration of XMPP server 10: Figure 2)
The XMPP server 10 is a server for establishing an XMPP session with an MFP (eg, MFP 200). The XMPP server 10 is installed on the Internet 8 by a vendor such as the MFP 200.

An XMPP session is a session that complies with XMPP. If the XMPP server 10 uses an Can be sent. That is, the XMPP session is a session that can execute server push type communication. The XMPP session continues to be established until the MFP is powered off. Note that the mechanism for transmitting a request from the XMPP server 10 to the MFP (that is, the mechanism for executing server push type communication) may be other methods than the XMPP session. For example, a session based on HTTPS (abbreviation for Hypertext Transfer Protocol Secure) may be established between the MFP and the XMPP server 10.

The XMPP server 10 includes a network interface 16 and a control unit 30. Each part 16, 30 is connected to a bus line (numerals omitted). Note that, below, the interface will be referred to as "I/F". The network I/F 16 is an I/F for executing communication via the Internet 8, and is connected to the Internet 8 (see FIG. 1). The control unit 30 includes a CPU 32 and a memory 34. The CPU 32 executes various processes according to the program 40 stored in the memory 34. The memory 34 is composed of volatile memory, nonvolatile memory, and the like. The memory 34 stores a management table 42 in addition to the program 40 described above.

The management table 42 is a table for managing information regarding the MFP. The management table 42 includes, for each of a plurality of MFPs, a management ID (abbreviation for Identifier) for managing the MFP, a UID that is identification information acquired from the MFP, model information of the MFP, and information about the MFP. This access token is associated and stored. The model information indicates information regarding the model of the corresponding MFP (eg, model name, performance). The access token is authentication information for establishing an XMPP session with the corresponding MFP. Here, when the XMPP server 10 receives a Call Back URL (abbreviation for Uniform Resource Locator), which will be described later, from the APP server 100, it stores the received Call Back URL in the management table 42 in association with the management ID.

(Configuration of APP server 100)
The APP server 100 is a server for communicating with an MFP (for example, the MFP 200) for email printing. Mail printing is a function that causes the MFP to print an image corresponding to image data included in an email. The APP server 100 is installed on the Internet 8 by a vendor such as the MFP 200.

The APP server 100 includes a network I/F 116 and a control unit 130. Each section 116, 130 is connected to a bus line (numerals omitted). Network I/F 116 is connected to the Internet 8 (see FIG. 1). The control unit 130 includes a CPU 132 and a memory 134. CPU 132 executes various processes according to program 140 stored in memory 134. The memory 134 stores a device table 142 and a job table 144 in addition to the program 140 described above.

The device table 142 is a table in which information regarding the MFP is registered. The device table 142 includes, for each of a plurality of MFPs, a UID obtained from the MFP, a management ID stored in association with the UID in the XMPP server 10, an email address used for email printing, and event information. and are stored in association with each other. The event information is information regarding an event that occurred within the APP server 100. Information regarding various events may be described in the event information. For example, when an event occurs in which the APP server 100 sends a Call Back URL (described later) to the XMPP server 10, the Call Back URL is described in the event information.

The job table 144 is a table that manages multiple print jobs. The job table 144 includes, for each of a plurality of print jobs, a UID, a management ID, a job ID for identifying the print job, a file name of image data corresponding to the print target of the print job, and the print job. The print URL corresponding to the print job, expiration date information indicating the expiration date of the print job, and status information corresponding to the print job are stored in association with each other. The print URL will be described later. The status information indicates the status of the corresponding print job. For example, when the print URL of the corresponding print job has been successfully transmitted to the MFP and printing is being executed on the MFP, the status information indicates "Printing started". Further, for example, if the transmission of the print URL of the corresponding print job to the MFP fails, the status information indicates "failure".

In email printing, the APP server 100 and the XMPP server 10 work together. As will be described in detail later, by using the XMPP session, it is possible to cause the MFP to print an image corresponding to the image data included in the e-mail without receiving a request from the MFP. Further, the vendor installs other APP servers other than the APP server 100 on the Internet 8. The other APP servers are servers for performing communication with the MFP for other functions using the Internet 8 other than email printing (for example, a function for transmitting setting values to the MFP via the Internet 8). For these other functions as well, other APP servers and the XMPP server 10 operate in cooperation. That is, one XMPP server 10 and a plurality of APP servers operate in conjunction. By establishing an XMPP session between one XMPP server 10 and the MFP, it is possible to cause the MFP to execute a plurality of functions using the Internet 8.

(Configuration of MFP200)
The MFP 200 is a peripheral device (that is, a peripheral device of a terminal device connected to the LAN 4) that can perform multiple functions including a print function, a scan function, and a facsimile function. The MFP 200 includes a display section 214, a LANI/F 216, a print execution section 218, a PSTN (Public Switched Telephone Network) I/F 220, and a control section 230. Each part 214 to 230 is connected to a bus line (numerals omitted). The display unit 214 is a display for displaying various information. The display section 214 is a so-called touch panel, and also functions as an operation section. The LAN I/F 216 is connected to the LAN 4 (see FIG. 1). The printing execution unit 218 includes a printing mechanism such as an inkjet method or a laser method. The PSTNI/F 220 is an I/F for performing facsimile communication.

The control unit 230 includes a CPU 232 and a memory 234. CPU 232 executes various processes according to program 240 stored in memory 234. The memory 234 further stores the UID "u01" of the MFP 200 and the model information MI of the MFP 200. The UID is information (for example, an account name) that identifies a user who uses MFP 200. Note that in a modified example, the UID may be information that identifies the MFP 200 (for example, a serial number).

(Setup process: Figure 3, Figure 4)
With reference to FIGS. 3 and 4, a setup process for registering information used for email printing communication in the APP server 100 and establishing an XMPP session will be described. Note that, in the following, from the viewpoint of ease of understanding, the processing executed by each CPU of each device (for example, the CPU 32 of the etc.) should be mainly described. Further, in the following, communication is performed between the MFP 200 and each server 10, 100 via the LAN 4 and the Internet 8. Further, communication is performed between the XMPP server 10 and the APP server 100 via the Internet 8. In the following, descriptions of "via the LAN 4" and "via the Internet 8" will be omitted unless otherwise specified.

At T5, the MFP 200 receives an operation from the user to change the email print setting from "invalid" to "enabled". The email print setting indicates a setting as to whether or not execution of email printing is permitted. "Invalid" indicates that execution of email printing is prohibited, and "Valid" indicates that execution of email printing is permitted. The email print setting indicates "invalid" by default.

When the email print setting is changed from "invalid" to "enabled" at T5, the MFP 200 transmits a registration request to the APP server 100 at T10 to request registration of information used for email print communication. The registration request includes UID "u01".

Upon receiving the registration request from the MFP 200 at T10, the APP server 100 generates an email address MA at T12. The email address MA includes a local part “mfp1” and the domain name of the APP server 100 “app.com”.

At T14, the APP server 100 transmits a management ID request to the XMPP server 10, requesting the XMPP server 10 for a management ID.

When the XMPP server 10 receives a management ID request from the APP server 100 at T14, it generates a management ID “a01” at T16, and stores the management ID “a01” in the management table 42.

At T18, the XMPP server 10 transmits the management ID "a01" to the APP server 100.

When the APP server 100 receives the management ID "a01" from the XMPP server 10 at T18, the APP server 100 combines the UID "u01" in the registration request at T10, the management ID "a01" received at T18, and the management ID "a01" generated at T12 at T20. The email address MA and empty event information are stored in the device table 142 in association with each other. As a result, information used for mail printing communication is registered in the APP server 100.

Subsequently, at T30, the APP server 100 transmits a PIN code request to the XMPP server 10 requesting a PIN (abbreviation for Personal Identification Number) code.

Upon receiving the PIN code request from the APP server 100 at T30, the XMPP server 10 generates a PIN code C at T32. The XMPP server 10 stores the management ID "a01" and the PIN code C in the memory 34 in association with each other.

At T34, the XMPP server 10 transmits the PIN code C to the APP server 100. Thereby, the APP server 100 transmits the PIN code C received from the XMPP server 10 to the MFP 200 at T36.

Upon receiving the PIN code C from the APP server 100 at T36, the MFP 200 transmits an establishment request to the XMPP server 10 requesting to establish an XMPP session at T50. The establishment request includes UID "u01", model information MI, and PIN code C.

When the XMPP server 10 receives the establishment request from the MFP 200 at T50, it authenticates the PIN code in the establishment request at T52. In this case, since the PIN code C in the establishment request matches the PIN code C in the memory 34 of the XMPP server 10, the PIN code authentication is successful. Then, the XMPP server 10 executes the processing from T54 onward. If the PIN code authentication fails, the XMPP server 10 does not execute the process after T54.

At T54, the XMPP server 10 generates an access token AT. The XMPP server 10 identifies the management ID "a01" stored in association with the PIN code C from the memory 34. Then, the XMPP server 10 associates the specified management ID "a01", the UID "u01" in the establishment request, the model information MI in the establishment request, and the generated access token AT, and creates a table in the management table 42. to be memorized. Note that, at this time, the Call Back URL is not stored in the management table 42 in association with the management ID "a01".

At T58, the XMPP server 10 transmits the access token AT to the MFP 200. As a result, the MFP 200 uses the access token AT to establish an XMPP session with the XMPP server 10 at T70.

Further, when the establishment of the XMPP session is completed, the MFP 200 transmits an e-mail address request requesting an e-mail address to the APP server 100 at T80. The email address request includes UID "u01".

Upon receiving the email address request from MFP 200 at T80, APP server 100 transmits email address MA stored in association with UID "u01" in the email address request to MFP 200 at T82.

Upon receiving the email address MA from the APP server 100 at T82, the MFP 200 displays the email address MA on the display unit 214 at T84. This allows the user to know the email address MA.

Subsequently, as shown in FIG. 4, the MFP 200 prints the email address MA. Specifically, at T100, the MFP 200 transmits a print URL request to the APP server 100 requesting a print URL for printing the email address MA. The print URL request includes UID "u01".

When the APP server 100 receives a print URL request from the MFP 200 at T100, the APP server 100 retrieves information stored in association with the UID "u01" in the print URL request from the device table 142 (i.e., management ID "a01" and email address MA). Identify. Then, in T102, the APP server 100 transmits a model information request requesting model information to the XMPP server 10. The model information request includes the specified management ID "a01".

Upon receiving the model information request from the APP server 100 at T102, the XMPP server 10 transmits the model information MI stored in association with the management ID "a01" in the model information request to the APP server 100 at T104.

Upon receiving the model information MI from the XMPP server 10 at T104, the APP server 100 generates a QR code (registered trademark) QC by encoding the email address MA at T106.

At T108, the APP server 100 generates image data corresponding to the image including the email address MA and the generated QR code QC. Then, the APP server 100 converts the image data using the model information MI to generate print data PD1 having a data format that can be interpreted by the MFP 200. Here, the APP server 100 generates print data PD1 according to print settings stored in the APP server 100 in advance.

At T112, the APP server 100 transmits the print URL "http://app.com/pd1" to the XMPP server 10. The print URL "http://app.com/pd1" indicates the location in the APP server 100 where the print data PD1 is stored. The character string "pd1" in the print URL "http://app.com/pd1" is the file name of the print data PD1.

When the XMPP server 10 receives the print URL "http://app.com/pd1" from the APP server 100 at T112, the XMPP server 10 uses the XMPP session with the MFP 200 to print the print URL "http://app.com/pd1" at T114. .com/pd1” to the MFP 200.

Upon receiving the print URL "http://app.com/pd1" from the XMPP server 10 at T114, the MFP 200 transmits a data request requesting print data to the APP server 100. The data request is an HTTP command that includes the print URL "http://app.com/pd1".

When the APP server 100 receives the data request from the MFP 200 at T130, the APP server 100 transmits the print data PD1 stored in the location indicated by the print URL "http://app.com/pd1" in the data request to the MFP 200 at T132. Send to.

Upon receiving the print data PD1 from the APP server 100 at T132, the MFP 200 prints an image including the email address MA and the QR code QC in accordance with the print data PD1 at T134. This allows the user to know the email address MA. Further, the user can input the email address MA into the terminal device by operating the terminal device (for example, 300) and photographing the QR code QC with the camera of the terminal device.

(Process for executing email printing: Figure 5)
Processing for executing mail printing will be described with reference to FIG. 5. At T200, the terminal device 300 transmits an e-mail EM including the e-mail address MA as the destination address to the APP server 100. The e-mail EM includes image data corresponding to the image to be printed.

When the APP server 100 receives the e-mail EM from the terminal device 300 at T200, it identifies the management ID "a01" stored in association with the e-mail address MA included in the e-mail EM from the device table 142. T202 and T204 are the same as T102 and T104 in FIG. 4.

At T208, the APP server 100 converts the image data included in the email EM using the model information MI to generate print data PD2 having a data format that can be interpreted by the MFP 200. Here, the APP server 100 generates print data PD2 according to the print settings (for example, paper size) input to the APP server 100 by the user. Note that in a modified example, the APP server 100 may generate the print data PD2 according to the print settings described in the body of the email EM.

At T210, the APP server 100 stores information regarding the print job to be executed according to the print data PD2 in the job table 144. Specifically, the APP server 100 associates the UID "u01" with the management ID "a01", the new job ID "j01", and the file name "id1" of the image data included in the email EM. , print URL "http://app.com/pd2", expiration date information PI1, and empty status information are stored in the job table 144. Here, the print URL "http://app.com/pd2" indicates the location in the APP server 100 where the print data PD2 is stored, and the character string "pd2" is the file name of the print data PD2. .

At T212, the APP server 100 transmits the management ID "a01", the print URL "http://app.com/pd2", and expiration date information to the XMPP server 10. As a result, the XMPP server 10 associates the management ID "a01", the print URL "http://app.com/pd2", and the expiration date information and stores them in the memory 34.

When the XMPP server 10 receives the print URL "http://app.com/pd2" etc. from the APP server 100 at T212, the XMPP server 10 uses the XMPP session to print the print URL "http://app.com/pd2". An attempt is made to send the message to the MFP 200. First, in T220, the XMPP server 10 determines whether an XMPP session with the MFP 200 is currently established. For example, when an XMPP session with the MFP 200 is currently established, the XMPP server 10 stores establishment information in the memory 34 in association with the management ID "a01" that identifies the MFP 200. to be memorized. If the establishment information is stored in association with the management ID "a01" received at T212, the XMPP server 10 determines that the XMPP session with the MFP 200 is currently established (YES at T220). In this case, the XMPP server 10 transmits the print URL "http://app.com/pd2" to the MFP 200 at T222 using the XMPP session. That is, the transmission of the print URL "http://app.com/pd2" to the MFP 200 is successful.

Upon receiving the print URL "http://app.com/pd2" from the XMPP server 10 at T222, the MFP 200 sends a response indicating that the print URL "http://app.com/pd2" has been received at T224. is sent to the XMPP server 10.

Upon receiving the response from the MFP 200 at T224, the XMPP server 10 transmits a change instruction to the APP server 100 at T226. The change instruction is an instruction to change the status information corresponding to the print URL "http://app.com/pd2" to "start printing." As a result, in T228, the APP server 100 changes the status information corresponding to the print URL "http://app.com/pd2" in the job table 144 to "start printing" in accordance with the change instruction.

Further, upon receiving the print URL "http://app.com/pd2" from the XMPP server 10 at T222, the MFP 200 sends a data request including the print URL "http://app.com/pd2" at T230. Send to the APP server 100. As mentioned above, the data request is an HTTP command. By using the print URL, print data can be received from the APP server 100 using a general-purpose HTTP command.

Upon receiving the data request from the MFP 200 at T230, the APP server 100 acquires print data PD2 from the location within the APP server 100 indicated by the print URL "http://app.com/pd2".

At T232, the APP server 100 transmits the print data PD2 to the MFP 200. As a result, the MFP 200 prints the image corresponding to the print data PD2 at T234.

On the other hand, if the establishment information is not stored in association with the management ID "a01" received at T212, the XMPP server 10 determines that the XMPP session with the MFP 200 is not currently established (NO at T220). In this case, sending the print URL "http://app.com/pd2" to the MFP 200 fails. The XMPP server 10 skips the process at T222 and executes the process from T250 onward in FIG. 6, which will be described later. Note that when sending the print URL "http://app.com/pd2" to the MFP 200 fails, the XMPP server 10 deletes the print URL "http://app.com/pd2" from the memory 34. . It is possible to prevent the print URL from leaking from the XMPP server 10 to the outside.

(Specific case where the XMPP session is not established: Figure 6)
Referring to FIG. 6, a specific case in which an XMPP session with MFP 200 is not currently established will be described. In this case, the XMPP session with the MFP 200 is disconnected because the power of the MFP 200 is turned off.

At T250, the XMPP server 10 transmits failure information to the APP server 100 indicating that the transmission of the print URL "http://app.com/pd2" to the MFP 200 has failed.

When the APP server 100 receives the failure information from the XMPP server 10 at T250, the APP server 100 updates event information associated with the print URL "http://app.com/pd2" in the device table 142 and job table 144 at T252. Write the Call Back URL “http://app.com/eventprinteronline” in . The character string "eventprinteronline" in the Call Back URL indicates the process that the APP server 100 should perform when the APP server 100 receives the Call Back URL from the XMPP server 10. The process indicated by the character string "eventprinteronline" is a process in which the APP server 100 resends the print URL to the XMPP server 10 in response to a notification from the XMPP server 10.

At T253, the APP server 100 changes the status information associated with the print URL "http://app.com/pd2" in the job table 144 to "failed".

At T254, the APP server 100 sends an event notification to the XMPP server 10. The event notification includes a management ID "a01" and a Call Back URL. Thereby, the XMPP server 10 stores the Call Back URL in association with the management ID "a01" in the management table 42.

Subsequently, at T256, the MFP 200 receives an operation from the user to turn on the power. As a result, the MFP 200 uses the access token AT to establish an XMPP session with the XMPP server 10 at T260.

When the XMPP server 10 establishes the XMPP session with the MFP 200 at T260, the XMPP server 10 determines whether the Call Back URL is stored in the management table 42 in association with the management ID "a01" that identifies the MFP 200 that has established the XMPP session at T262. Decide whether or not. When the XMPP server 10 determines that the Call Back URL is stored in association with the management ID "a01" in the management table 42 (YES at T262), it executes the processes from T264 onwards. On the other hand, if the XMPP server 10 determines that the Call Back URL is not stored in association with the management ID "a01" in the management table 42 (NO at T262), it skips the processing from T264 onwards and ends the processing in FIG. do.

At T264, the XMPP server 10 identifies expiration date information stored in association with the management ID "a01" from the memory 34. Then, the XMPP server 10 determines whether the current date and time is within the expiration date indicated by the specified expiration date information. When the XMPP server 10 determines that the current date and time is within the expiration date (YES at T262), it executes the processes from T264 onwards. On the other hand, if the XMPP server 10 determines that the current date and time has passed the expiration date (YES at T262), it skips the processing from T264 onwards and ends the processing in FIG. 6. According to such a configuration, it is possible to set an expiration date for a print job for printing an image included in an e-mail EM, and when the expiration date passes, the image included in the e-mail EM is deleted. It is possible to suppress the printing of images that are present.

At T266, the XMPP server 10 identifies the Call Back URL stored in association with the management ID "a01" from the memory 34. Then, the XMPP server 10 transmits an establishment notification to the APP server 100 to notify that the XMPP session has been established. The establishment notification is an HTTP command that includes a management ID "a01" and a Call Back URL.

Upon receiving the establishment notification from the XMPP server 10 at T266, the APP server 100 executes the processes at T268 and T270 in accordance with the Call Back URL string "eventprinteronline" in the establishment notification at T268.

At T268, the APP server 100 confirms that the Call Back URL is described in the event information associated with the management ID "a01" in the establishment notification in the device table 142. Subsequently, the APP server 100 identifies the print URL "http://app.com/pd2" that is associated with both the management ID "a01" and the status information "failed" from the job table 144. Then, the APP server 100 transmits the management ID "a01" and the specified print URL "http://app.com/pd2" to the XMPP server 10 at T270.

T274 to T284 are similar to T222 to T234 in FIG. 5. That is, when the XMPP session with the XMPP server 10 is re-established, the MFP 200 receives the print URL "http://app.com/pd2" from the XMPP server 10 without transmitting a request to the XMPP server 10. can do. As a result, MFP 200 can print the image corresponding to print data PD2.

Here, there is a situation in which the print settings stored in the APP server 100 are changed by the user between the generation of the print data PD2 at T208 in FIG. 5 and the establishment of the XMPP session at T260 in FIG. is assumed. In this situation, the APP server 100 newly generates print data PD3 according to the changed print settings. Then, the APP server 100 changes the print URL "http://app.com/pd2" to the print URL "http://app.com/pd3" indicating the location where the print data PD3 is stored in the job table 144. Update. In such a case, upon receiving the establishment notification from the XMPP server 10 at T266, the APP server 100 transmits the print URL "http://app.com/pd3" to the XMPP server 10. As a result, the print URL "http://app.com/pd3" is transmitted to the MFP 200, and the MFP 200 can receive the print data PD3 from the APP server 100. Then, the MFP 200 can print the image according to the changed print settings.

(Effects of this example)
According to the configuration of this embodiment, since the XMPP session is disconnected between the MFP 200 and the XMPP server 10, the print URL "http://app.com/pd2" cannot be sent to the MFP 200. If it fails, the APP server 100 sends an event notification to the XMPP server 10 (T254 in FIG. 6). As a result, when the XMPP session is re-established, the XMPP server 10 uses each piece of information in the event notification to obtain the print URL "http://app.com/pd2" (T266 to T270). . Then, the XMPP server 10 uses the XMPP session to transmit the print URL "http://app.com/pd2" to the MFP 200 (T274). That is, when the XMPP session is re-established, the XMPP server 10 sends the print URL "http://app.com/pd2" to the MFP 200 even if no request is sent from the MFP 200 to the XMPP server 10. can be sent. In this way, when an XMPP session is established after a print URL transmission failure, no request is sent from the MFP 200 to the XMPP server 10, so that unnecessary communication between the MFP 200 and the XMPP server 10 is prevented. Can be suppressed.

Further, for example, a comparative example is assumed in which the processes from T266 to T270 are not executed, that is, the APP server 100 does not resend the print URL "http://app.com/pd2" to the XMPP server 10. In this comparative example, for example, when the XMPP session with the MFP 200 is re-established, the XMPP server 10 prints the print URL "http: //app.com/pd2" and sends the acquired print URL "http://app.com/pd2" to the MFP 200 using the XMPP session. That is, in the comparative example, the XMPP server 10 continues to store the print URL "http://app.com/pd2" in the memory 34. In contrast, in this embodiment, the XMPP server 10 can receive the print URL from the APP server 100 using the Call Back URL, so the print URL "http://app.com/pd2" There is no need to continue storing it in the memory 34. It is possible to prevent the printing URL from leaking to the outside from the XMPP server 10. Furthermore, even if the print data is changed due to a change in the print settings, the XMPP server 10 uses the Call Back URL to send the latest print URL indicating the location where the updated print data is stored from the APP server 100. can be received. Note that, in the modified example, the configuration of the comparative example may be adopted.

(correspondence)
The XMPP server 10, APP server 100, MFP 200, and terminal device 300 are examples of a "first server,""secondserver,""communicationdevice," and "terminal device," respectively. An XMPP session is an example of a "session." The print URL "http://app.com/pd2" is changed to "first related information, first instruction information, second related information, second instruction information, first URL, and second This is an example of "URL". The Call Back URL and management ID "a01" are examples of "acquisition information". The image data included in the e-mail EM at T200 in FIG. 5 is an example of "first data." Print data PD2 is an example of "second data". The establishment notification at T266 in FIG. 6 is an example of a "specific notification."
Management ID "a01" is an example of "specific information". Call Back URL is an example of a "specific URL." The email address MA is an example of a "specific email address." The period from when the event notification is received at T254 in FIG. 6 until the expiration of the expiration date is an example of the "predetermined period." The e-mail address MA at T82 in FIG. 3 and the print data PD1 at T132 in FIG. 4 are examples of "output information".

T212 and T220 in FIG. 5 and T250, T254, T270, T274, T280, and T282 in FIG. 6 are respectively "first related information transmitting unit (and first related information receiving unit)" and "trial unit", "Failure information transmitting unit (and failure information receiving unit)", "Acquired information transmitting unit (and acquired information receiving unit)", "Acquisition unit", "Instruction information transmitting unit", "Device side transmitting unit", "Data transmitting unit" This is an example of "Part".

(Second example)
In the first embodiment, mail printing is executed. Instead of this, in the second embodiment, application printing is executed. In application printing, the APP server 100 receives an HTTP command containing image data instead of an email containing image data. This allows the APP server 100 and the XMPP server 10 to work together to cause the MFP 200 to print an image corresponding to the image data included in the HTTP command.

(Configuration of APP server 100: Figure 2)
The APP server 100 of this embodiment is similar to the APP server 100 of the first embodiment except that the information in the device table 142 is different. Specifically, the device table 142 stores a UID, a management ID, a terminal ID that is identification information of a terminal device, and event information in association with each other.

(Setup process: Figure 3)
The setup process of this embodiment will be described with reference to FIG. 3. The registration process of this embodiment is different from the setup process of the first embodiment, except that the contents of T10, T20, T36, and T50 are different, and the processes of T12, T80 to T84, and the process of FIG. 4 are not executed. The same is true.

At T10, the APP server 100 receives a registration request including the UID "u01" and the terminal ID "t01" from the terminal device 300. As a result, at T20, the APP server 100 stores the UID "u01", the management ID "a01", the terminal ID "t01", and empty event information in the device table 142 in association with each other. Further, at T36, the APP server 100 transmits the PIN code C received from the XMPP server 10 to the terminal device 300. Thereby, the terminal device 300 displays the PIN code C.

At T50, MFP 200 receives input of PIN code C from the user. Then, the MFP 200 transmits an establishment request including the input PIN code C to the XMPP server 10.

(Processing to execute application printing: Figure 7)
Processing for executing mail printing will be described with reference to FIG. 7. At T302, the terminal device 300 starts a printing application for printing an image in response to a user's operation. The terminal device 300 displays a selection screen for selecting an image to be printed and print settings according to the print application.

At T304, the terminal device 300 accepts selections of images and print settings on the selection screen. At T400, the terminal device 300 transmits to the APP server 100 an HTTP command including the image data corresponding to the selected image, the selected print settings, and the terminal ID "t01".

At T400, upon receiving the HTTP command, the APP server 100 identifies the management ID "a01" stored in association with the terminal ID "t01" included in the HTTP command from the device table 142. T402 to T434 are similar to T202 to T234 in FIG.

(Effects of this example)
As shown in FIG. 7, in this embodiment as well, the XMPP server 10 determines whether an XMPP session with the MFP 200 is currently established at T420. Then, when the XMPP server 10 determines that the XMPP session with the MFP 200 is not currently established (NO at T420), it executes the same process as in FIG. 6 of the first embodiment. That is, in this embodiment as well, as in the first embodiment, when an XMPP session is established after a print URL transmission failure, no request is sent from the MFP 200 to the XMPP server 10, so the communication between the MFP 200 and the XMPP server 10 is It is possible to suppress unnecessary communication between the two.

(correspondence)
The image data included in the HTTP command T400 in FIG. 7 is an example of "first data."

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) The "communication device" is not limited to the MFP 200, and may be, for example, a printer, a scanner, a facsimile device, a PC, a server, or the like.

(Modification 2) In each of the above embodiments, the XMPP server 10 uses the XMPP session to transmit the print URL to the MFP 200 (T222 in FIG. 5, T274 in FIG. 6). Alternatively, the XMPP server 10 may transmit information obtained by encrypting the print URL to the MFP 200. In this modification, information obtained by encrypting the print URL is an example of "first instruction information (and second instruction information)."

(Variation 3) The "second related information" is not limited to the print URL "http://app.com/pd2", but also the print URL "http: //app.com/pd3". In this modification, the "second related information" may be different from the "first related information." Note that the print URL and Call Back URL described in this specification include "http://", but at least one of them may include, for example, "https://".

(Modification 4) In each of the above embodiments, the APP server 100 converts image data to generate print data, and sends the print data to the MFP 200. Alternatively, the APP server 100 may transmit the image data itself to the MFP 200. In this modification, the "second data" may be the same as the "first data".

(Variation 5) In each of the above embodiments, the APP server 100 transmits the print URL indicating the location where the print data PD2 is stored to the XMPP server 10 (T212 in FIG. 5). Alternatively, the APP server 100 may transmit to the XMPP server 10 a data URL indicating the location where the image data in the email EM is stored. Then, when receiving the data URL from the MFP 200, the APP server 100 may generate print data by converting the image data stored at the location indicated by the data URL. In this modification, the data URL is an example of "first related information (and second related information)."

(Variation 6) In each of the above embodiments, the XMPP server 10 transmits an establishment notification including the Call Back URL received from the APP server 100 to the APP server 100 (T266 in FIG. 6). Alternatively, the XMPP server 10 may generate an instruction notification indicating the process to be executed by the APP server 100 using the Call Back URL, and may send the instruction notification to the APP server 100. In this modification, the instruction notification is an example of a "specific notification."

(Modification 7) As a modification, the configuration of the above comparative example, that is, the XMPP server 10 retrieves the stored print URL "http" from the memory 34 of the XMPP server 10 according to the character string "eventprinteronline" in the Call Back URL ://app.com/pd2" may be adopted. In this modification, the "specific notification" can be omitted.

(Modification 8) In each of the above embodiments, the XMPP server 10 receives the management ID "a01" from the APP server 100, and after re-establishing the XMPP session, sends an establishment notification containing the management ID "a01" to the APP server 100. (T266 in FIG. 6). Alternatively, the XMPP server 10 may receive URL identification information that identifies the print URL stored in the APP server 100, and may transmit the URL identification information to the APP server 100 after re-establishing the XMPP session. . In this modification, the URL identification information is an example of "acquisition information," and the "specific information" can be omitted.

(Modification 9) In each of the above embodiments, the APP server 100 transmits an event notification including the management ID "a01" and the Call Back URL to the XMPP server 10 (T254 in FIG. 6). Alternatively, the APP server 100 may send an event notification containing only the management ID "a01" to the XMPP server 10. In this modification, "specific URL" can be omitted.

(Modification 10) In each of the above embodiments, the APP server 100 registers the email address MA with the APP server 100 when a registration request is received from the MFP 200 (T20 in FIG. 3). Alternatively, the email address MA may be registered in the APP server 100 in advance. In this modification, the "registration request" can be omitted.

(Modification 11) T80 to T84 in FIG. 3 and the processing in FIG. 4 may not be executed. In this modification, "output information" can be omitted.

(Modification 12) The “first related information (and second related information)” is not limited to the print URL, but also information for identifying print data (or image data) stored in the APP server 100, for example. It may also be data identification information. In this modification, the "first URL (and second URL)" can be omitted.

(Modification 13) The process at T264 in FIG. 6 may not be executed. In this modification, the "predetermined period" can be omitted.

(Modification 14) The "first data" is not limited to image data, and may be, for example, setting values of the MFP 200.

(Modification 15) The "second data" is not limited to print data, but may be facsimile information including image data, for example. In this case, when receiving facsimile information from the APP server 100, the MFP 200 converts image data included in the facsimile information to generate facsimile data, and transmits the facsimile data to a predetermined destination via the PSTN I/F 220. You may.

(Modification 16) In each of the above embodiments, each of the processes shown in FIGS. 3 to 7 is realized by software (eg, programs 40, 140, 240), but at least one of these processes is implemented using a logic circuit or the like. It may be realized by hardware.

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.
The features of the technology disclosed in this specification are listed below.
(Item 1)
A communication system,
a communication device;
a first server;
a second server;
The second server is
comprising a first related information transmitter that transmits first related information related to the first data to the first server when the first data is received from the terminal device,
The first server is:
When the first related information is received from the second server, first instruction information corresponding to the first related information is sent using a session for executing server push type communication. an attempt unit that attempts to transmit to the communication device;
If transmission of the first instruction information to the communication device fails due to the session not being established between the communication device and the first server, the failure information is sent to the first server. a failure information transmitter for transmitting to the second server;
The second server further includes:
an acquisition information transmitter that transmits acquisition information for acquiring second related information related to the first data to the first server when the failure information is received from the first server; Prepare,
The first server further includes:
When the session is established between the communication device and the first server after the acquired information is received from the second server, the acquired information is used to determine the second association. an acquisition unit that acquires information;
an instruction information transmitter that transmits second instruction information corresponding to the second related information to the communication device using the session when the second related information is acquired;
The communication device includes:
comprising a device-side transmitter that transmits the second related information corresponding to the second instruction information to the second server when the second instruction information is received from the first server;
The second server further includes:
a data transmitter that transmits second data obtained using the first data related to the second related information to the communication device when the second related information is received from the communication device; Equipped with
Communications system.
(Item 2)
A first server,
a first related information receiving unit that receives first related information related to the first data from the second server when the second server receives the first data from the terminal device;
When the first related information is received from the second server, first instruction information corresponding to the first related information is sent using a session for executing server push type communication. an attempt section that attempts to transmit to the communication device;
If transmission of the first instruction information to the communication device fails due to the session not being established between the communication device and the first server, the failure information is sent to the first server. a failure information transmitter that transmits to the second server;
an acquisition information receiving unit that receives acquisition information for acquiring second related information related to the first data from the second server when the failure information is transmitted to the second server; and,
When the session is established between the communication device and the first server after the acquired information is received from the second server, the acquired information is used to determine the second association. an acquisition unit that acquires information;
An instruction information transmitting unit that transmits second instruction information corresponding to the second related information to the communication device using the session when the second related information is acquired,
The communication device transmits the second related information corresponding to the second instruction information to the second server when the second instruction information is received from the first server,
When the second related information is received from the communication device, the second server transmits second data obtained using the first data related to the second related information to the communication device. the instruction information transmitter that transmits to the device;
A first server comprising:
(Item 3)
The acquisition unit includes:
When the session is established between the communication device and the first server after the acquired information is received from the second server, the second server sends a specific notification using the acquired information. server,
The first server according to item 2, wherein the first server obtains the second related information by receiving the second related information from the second server that has received the specific notification.
(Item 4)
The acquisition information includes specific information for specifying the first data received by the second server,
The first server according to item 3, wherein the specific notification includes the specific information.
(Item 5)
The acquired information includes a specific URL (abbreviation for Uniform Resource Locator) indicating a process to be executed by the second server,
The specific notification includes the specific URL,
When the second server receives the specific notification including the specific URL from the first server, the second server transmits the second related information to the first server according to the specific URL. , the first server according to any one of items 3 and 4.
(Item 6)
The first server according to any one of items 2 to 5, wherein the first data is included in an email that includes a specific email address that includes the domain name of the second server as a destination address.
(Item 7)
The second server registers the specific email address with the second server when receiving a registration request from the communication device,
The first server further includes:
The first server according to item 6, further comprising an establishment unit that establishes the session with the communication device after the specific email address is registered in the second server.
(Item 8)
The first server according to item 7, wherein the specific email address is output by the communication device after the specific email address is registered in the second server.
(Item 9)
The first server according to any one of items 2 to 5, wherein the first data is included in a command according to Hypertext Transfer Protocol whose transmission source is the terminal device.
(Item 10)
The first related information includes a first URL (abbreviation for Uniform Resource Locator) indicating the location of data in the second server,
The first server according to any one of items 2 to 9, wherein the second related information includes a second URL indicating a location of data in the second server.
(Item 11)
The acquisition unit is configured to acquire the acquisition information when the session is established between the communication device and the first server before a predetermined period of time has elapsed since the acquisition information was received from the second server. obtaining second related information;
When the session is established between the communication device and the first server after the predetermined period has elapsed since the acquisition information was received from the second server, the second related information The first server according to any one of items 2 to 10, wherein the first server is not obtained.
(Item 12)
The communication device is a device capable of executing a printing function,
The first server according to any one of items 2 to 11, wherein the second data is data for causing the communication device to print an image corresponding to the second data.
(Item 13)
13. The server according to any one of items 2 to 12, wherein the session follows the EXtensible Messaging and Presence Protocol.
(Item 14)
a second server,
A first related information transmitting unit that transmits first related information related to the first data to a first server when first data is received from a terminal device,
When the first related information is received from the second server, the first server responds to the first related information using a session for performing server push type communication. the first related information transmitting unit that attempts to transmit first instruction information to the communication device;
When the transmission of the first instruction information to the communication device fails due to the session not being established between the communication device and the first server, the first server a failure information receiving unit that receives failure information from;
an acquisition information transmitter that transmits acquisition information for acquiring second related information related to the first data to the first server when the failure information is received from the first server; There it is,
The first server uses the acquired information when the session is established between the communication device and the first server after the acquired information is received from the second server. and obtain the second related information,
When the second related information is acquired, the first server uses the session to transmit second instruction information corresponding to the second related information to the communication device,
The communication device transmits the second related information corresponding to the second instruction information to the second server when the second instruction information is received from the first server. an acquisition information transmission section;
data transmission, transmitting second data obtained using the first data related to the second related information to the communication device when the second related information is received from the communication device; Department and
A second server comprising:
(Item 15)
The second server further includes:
When the session is established between the communication device and the first server after the acquired information is transmitted to the first server, the acquired information is used from the first server. a notification receiving unit that receives a specific notification;
a second related information transmitter that transmits the second related information to the second server in accordance with the specific notification when the specific notification is received from the first server;
Equipped with
The second server according to item 14, wherein the first server obtains the second related information by receiving the second related information from the second server.
(Item 16)
The acquisition information includes specific information for specifying the first data received by the second server,
The second server according to item 15, wherein the specific notification includes the specific information.
(Item 17)
The acquired information includes a specific URL (abbreviation for Uniform Resource Locator) indicating a process to be executed by the second server,
The specific notification includes the specific URL,
When receiving the specific notification including the specific URL from the first server, the second related information transmitting unit transmits the second related information to the first server according to the specific URL. 17. The first server according to any one of item 15 or 16, transmitting to.
(Item 18)
18. The second server according to any one of items 14 to 17, wherein the first data is included in an e-mail that includes as a destination address a specific e-mail address that includes a domain name of the second server.
(Item 19)
The second server further includes:
memory and
a registration unit that registers the specific email address in the memory when receiving a registration request from the communication device;
The second method according to item 18, further comprising: an output information transmitting unit that transmits output information for outputting the specific email address to the communication device after the specific email address is registered in the memory. server.
(Item 20)
A computer program for a first server, the computer program comprising:
The computer program causes the computer of the first server to run the following parts, namely:
a first related information receiving unit that receives first related information related to the first data from the second server when the second server receives the first data from the terminal device;
When the first related information is received from the second server, first instruction information corresponding to the first related information is sent using a session for executing server push type communication. an attempt section that attempts to transmit to the communication device;
If transmission of the first instruction information to the communication device fails due to the session not being established between the communication device and the first server, the failure information is sent to the first server. a failure information transmitter that transmits to the second server;
an acquisition information receiving unit that receives acquisition information for acquiring second related information related to the first data from the second server when the failure information is transmitted to the second server; and,
When the session is established between the communication device and the first server after the acquired information is received from the second server, the acquired information is used to determine the second association. an acquisition unit that acquires information;
An instruction information transmitting unit that transmits second instruction information corresponding to the second related information to the communication device using the session when the second related information is acquired,
The communication device transmits the second related information corresponding to the second instruction information to the second server when the second instruction information is received from the first server,
When the second related information is received from the communication device, the second server transmits second data obtained using the first data related to the second related information to the communication device. the instruction information transmitter that transmits to the device;
A computer program that functions as
(Item 21)
A computer program for a second server, the computer program comprising:
The computer program causes the computer of the second server to run the following parts:
A first related information transmitting unit that transmits first related information related to the first data to a first server when first data is received from a terminal device,
When the first related information is received from the second server, the first server responds to the first related information using a session for performing server push type communication. the first related information transmitting unit that attempts to transmit first instruction information to the communication device;
When the transmission of the first instruction information to the communication device fails due to the session not being established between the communication device and the first server, the first server a failure information receiving unit that receives failure information from;
an acquisition information transmitter that transmits acquisition information for acquiring second related information related to the first data to the first server when the failure information is received from the first server; There it is,
The first server uses the acquired information when the session is established between the communication device and the first server after the acquired information is received from the second server. and obtain the second related information,
When the second related information is acquired, the first server uses the session to transmit second instruction information corresponding to the second related information to the communication device,
The communication device transmits the second related information corresponding to the second instruction information to the second server when the second instruction information is received from the first server. an acquisition information transmission section;
data transmission of transmitting second data obtained using the first data related to the second related information to the communication device when the second related information is received from the communication device; Department and
A computer program that functions as

2: Communication system, 8: Internet, 10: XMPP server, 16: Network I/F, 30: Control unit, 32: CPU, 34: Memory, 40: Program, 42: Management table, 100: APP server, 116: Network I/F, 130: Control unit, 132: CPU, 134: Memory, 140: Program, 142: Device table, 144: Job table, 200: MFP, 214: Display unit, 218: Print execution unit, 220: PSTNI /F, 230: Control unit, 232: CPU, 234: Memory, 240: Program, 300: Terminal device, AT: Access token, C: PIN code, EM: Email, MA: Email address, MI: Model information, PD1, PD2, PD3: Print data, PI1: Expiry date information, QC: QR code

Claims (21)

A communication system,
a communication device;
a first server;
a second server;
The second server is
comprising a first related information transmitter that transmits first related information related to the first data to the first server when the first data is received from the terminal device,
The first server is:
When the first related information is received from the second server, first instruction information corresponding to the first related information is sent using a session for executing server push type communication. an attempt unit that attempts to transmit to the communication device;
If transmission of the first instruction information to the communication device fails due to the session not being established between the communication device and the first server, the failure information is sent to the first server. a failure information transmitter for transmitting to the second server;
The second server further includes:
an acquisition information transmitter that transmits acquisition information for acquiring second related information related to the first data to the first server when the failure information is received from the first server; Prepare,
The first server further includes:
When the session is established between the communication device and the first server after the acquired information is received from the second server, the acquired information is used to determine the second association. an acquisition unit that acquires information;
an instruction information transmitter that transmits second instruction information corresponding to the second related information to the communication device using the session when the second related information is acquired;
The communication device includes:
comprising a device-side transmitter that transmits the second related information corresponding to the second instruction information to the second server when the second instruction information is received from the first server;
The second server further includes:
a data transmitter that transmits second data obtained using the first data related to the second related information to the communication device when the second related information is received from the communication device; Equipped with
Communications system. A first server,
a first related information receiving unit that receives first related information related to the first data from the second server when the second server receives the first data from the terminal device;
When the first related information is received from the second server, first instruction information corresponding to the first related information is sent using a session for executing server push type communication. an attempt section that attempts to transmit to the communication device;
If transmission of the first instruction information to the communication device fails due to the session not being established between the communication device and the first server, the failure information is sent to the first server. a failure information transmitter that transmits to the second server;
an acquisition information receiving unit that receives acquisition information for acquiring second related information related to the first data from the second server when the failure information is transmitted to the second server; and,
When the session is established between the communication device and the first server after the acquired information is received from the second server, the acquired information is used to determine the second association. an acquisition unit that acquires information;
An instruction information transmitting unit that transmits second instruction information corresponding to the second related information to the communication device using the session when the second related information is acquired,
The communication device transmits the second related information corresponding to the second instruction information to the second server when the second instruction information is received from the first server,
When the second related information is received from the communication device, the second server transmits second data obtained using the first data related to the second related information to the communication device. the instruction information transmitter that transmits to the device;
A first server comprising: The acquisition unit includes:
When the session is established between the communication device and the first server after the acquired information is received from the second server, the second server sends a specific notification using the acquired information. server,
The first server according to claim 2, wherein the first server obtains the second related information by receiving the second related information from the second server that has received the specific notification. The acquisition information includes specific information for specifying the first data received by the second server,
The first server according to claim 3, wherein the specific notification includes the specific information. The acquired information includes a specific URL (abbreviation for Uniform Resource Locator) indicating a process to be executed by the second server,
The specific notification includes the specific URL,
When the second server receives the specific notification including the specific URL from the first server, the second server transmits the second related information to the first server according to the specific URL. , the first server according to claim 3 or 4. The first server according to any one of claims 2 to 5, wherein the first data is included in an email that includes a specific email address that includes the domain name of the second server as a destination address. . The second server registers the specific email address with the second server when receiving a registration request from the communication device,
The first server further includes:
The first server according to claim 6, further comprising an establishment unit that establishes the session with the communication device after the specific email address is registered in the second server. The first server according to claim 7, wherein the specific email address is output by the communication device after the specific email address is registered in the second server. The first server according to any one of claims 2 to 5, wherein the first data is included in a command according to Hypertext Transfer Protocol whose transmission source is the terminal device. The first related information includes a first URL (abbreviation for Uniform Resource Locator) indicating the location of data in the second server,
The first server according to any one of claims 2 to 9, wherein the second related information includes a second URL indicating the location of data within the second server. The acquisition unit is configured to acquire the acquisition information when the session is established between the communication device and the first server before a predetermined period of time has elapsed since the acquisition information was received from the second server. obtaining second related information;
When the session is established between the communication device and the first server after the predetermined period has elapsed since the acquisition information was received from the second server, the second related information 11. The first server according to any one of claims 2 to 10, wherein the first server is not obtained. The communication device is a device capable of executing a printing function,
12. The first server according to claim 2, wherein the second data is data for causing the communication device to print an image corresponding to the second data. 13. A first server according to any one of claims 2 to 12, wherein the session follows the EXtensible Messaging and Presence Protocol. a second server,
A first related information transmitting unit that transmits first related information related to the first data to a first server when first data is received from a terminal device,
When the first related information is received from the second server, the first server responds to the first related information using a session for performing server push type communication. the first related information transmitting unit that attempts to transmit first instruction information to the communication device;
When the transmission of the first instruction information to the communication device fails due to the session not being established between the communication device and the first server, the first server a failure information receiving unit that receives failure information from;
an acquisition information transmitter that transmits acquisition information for acquiring second related information related to the first data to the first server when the failure information is received from the first server; There it is,
The first server uses the acquired information when the session is established between the communication device and the first server after the acquired information is received from the second server. and obtain the second related information,
When the second related information is acquired, the first server uses the session to transmit second instruction information corresponding to the second related information to the communication device,
The communication device transmits the second related information corresponding to the second instruction information to the second server when the second instruction information is received from the first server. an acquisition information transmission section;
data transmission, transmitting second data obtained using the first data related to the second related information to the communication device when the second related information is received from the communication device; Department and
A second server comprising: The second server further includes:
When the session is established between the communication device and the first server after the acquired information is transmitted to the first server, the acquired information is used from the first server. a notification receiving unit that receives a specific notification;
a second related information transmitter that transmits the second related information to the second server in accordance with the specific notification when the specific notification is received from the first server;
Equipped with
The second server according to claim 14, wherein the first server obtains the second related information by receiving the second related information from the second server. The acquisition information includes specific information for specifying the first data received by the second server,
The second server according to claim 15, wherein the specific notification includes the specific information. The acquired information includes a specific URL (abbreviation for Uniform Resource Locator) indicating a process to be executed by the second server,
The specific notification includes the specific URL,
When receiving the specific notification including the specific URL from the first server, the second related information transmitting unit transmits the second related information to the first server according to the specific URL. 17. The second server according to claim 15 or 16, wherein the second server transmits to:. The second server according to any one of claims 14 to 17, wherein the first data is included in an email that includes as a destination address a specific email address that includes a domain name of the second server. . The second server further includes:
memory and
a registration unit that registers the specific email address in the memory when receiving a registration request from the communication device;
The second device according to claim 18, further comprising: an output information transmitting unit that transmits output information for outputting the specific email address to the communication device after the specific email address is registered in the memory. server. A computer program for a first server, the computer program comprising:
The computer program causes the computer of the first server to run the following parts, namely:
a first related information receiving unit that receives first related information related to the first data from the second server when the second server receives the first data from the terminal device;
When the first related information is received from the second server, first instruction information corresponding to the first related information is sent using a session for executing server push type communication. an attempt section that attempts to transmit to the communication device;
If transmission of the first instruction information to the communication device fails due to the session not being established between the communication device and the first server, the failure information is sent to the first server. a failure information transmitter that transmits to the second server;
an acquisition information receiving unit that receives acquisition information for acquiring second related information related to the first data from the second server when the failure information is transmitted to the second server; and,
When the session is established between the communication device and the first server after the acquired information is received from the second server, the acquired information is used to determine the second association. an acquisition unit that acquires information;
An instruction information transmitting unit that transmits second instruction information corresponding to the second related information to the communication device using the session when the second related information is acquired,
The communication device transmits the second related information corresponding to the second instruction information to the second server when the second instruction information is received from the first server,
When the second related information is received from the communication device, the second server transmits second data obtained using the first data related to the second related information to the communication device. the instruction information transmitter that transmits to the device;
A computer program that functions as A computer program for a second server, the computer program comprising:
The computer program causes the computer of the second server to run the following parts:
A first related information transmitting unit that transmits first related information related to the first data to a first server when first data is received from a terminal device,
When the first related information is received from the second server, the first server responds to the first related information using a session for performing server push type communication. the first related information transmitting unit that attempts to transmit first instruction information to the communication device;
When the transmission of the first instruction information to the communication device fails due to the session not being established between the communication device and the first server, the first server a failure information receiving unit that receives failure information from;
an acquisition information transmitter that transmits acquisition information for acquiring second related information related to the first data to the first server when the failure information is received from the first server; There it is,
The first server uses the acquired information when the session is established between the communication device and the first server after the acquired information is received from the second server. and obtain the second related information,
When the second related information is acquired, the first server uses the session to transmit second instruction information corresponding to the second related information to the communication device,
The communication device transmits the second related information corresponding to the second instruction information to the second server when the second instruction information is received from the first server. an acquisition information transmission section;
data transmission of transmitting second data obtained using the first data related to the second related information to the communication device when the second related information is received from the communication device; Department and
A computer program that functions as

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