JP2017123117A - Communication device, communication system, communication method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to connect a device with a plurality of host devices simultaneously.SOLUTION: A communication device 1 includes: a first device function unit 11 for communicating with a testing host device 2; a second device function unit 12 for communicating with an external host device 3; a host function unit 13 for communicating with a testing device 4; and a communication controller 16 for transmitting first down data that the first device function unit 11 receives from the testing host device 2 and second down data that the second device function unit 12 receives from the external host device 3 to the testing device 4 via the host function unit 13.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a communication device, a communication system, a communication method, and a program for transmitting and receiving data.

  USB (Universal Serial Bus) is widely used as an interface for transmitting and receiving data between electronic devices. In the USB standard, a host device such as a computer and a device device such as a printer and a memory are defined, and data is transmitted and received between the host device and the device device. In recent years, with the widespread use of USB, there is an increasing need to connect a plurality of host devices to a single device device. In Patent Document 1, a device device having an interface for connecting a plurality of host devices is disclosed.

JP 2009-217334 A

  By using the conventional device device described in Patent Document 1, it is possible to connect one device device to a plurality of host devices. However, in the conventional device device, it is necessary to switch a plurality of host devices to be connected, and it is difficult to connect the device device simultaneously with the plurality of host devices.

  Therefore, the present invention has been made in view of this point, and an object thereof is to provide a communication device, a communication system, a communication method, and a program for enabling a device device to be simultaneously connected to a plurality of host devices. And

  In the first aspect of the present invention, a first device function unit that communicates with a first host device, a second device function unit that communicates with a second host device, a host function unit that communicates with a device device, First device data received by one device function unit from the first host device and second downlink data received by the second device function unit from the second host device via the host function unit And a communication control unit for transmitting to the communication device.

  The host function unit receives, for example, uplink data received from the device device, and the communication control unit receives first uplink data among the uplink data received by the host function unit as the first device. The second uplink data is transmitted to the first host device via the function device, and the second uplink data is transmitted to the second host device via the second device function device.

  The communication control unit transmits the first downlink data received via the first device function unit to the device apparatus using one or more first communication pipes and receives the first downlink data from the second device function unit. The second downlink data may be transmitted to the device device using one or more second communication pipes.

  The above communication device uses the identification information of the one or more first communication pipes used for transmission / reception of the first data transmitted / received between the first host device and the device device as the first host device and the device The second host device stores identification information of the one or more second communication pipes stored in association with a device device and used for transmission / reception of second data transmitted / received between the second host device and the device device. And a storage unit that stores the information in association with the device device.

  The device device executes at least a first application and a second application, and the storage unit stores identification information of the one or more first communication pipes in association with the first host device and the first application, The identification information of the one or more second communication pipes may be stored in association with the second host device and the second application.

  The communication control unit includes identification information of the one or more first communication pipes used for communication with the first host device and identification of the one or more second communication pipes used for communication with the second host device. Information may be notified to the device apparatus.

  The communication control unit receives the communication request from the second host device during communication between the first host device and the device device via the one or more first communication pipes. Alternatively, the identification information of the one or more second communication pipes may be notified.

  The communication device further includes a reception unit that receives a stop instruction to stop transmission of the first downlink data received from the first host device to the device device, and the communication control unit includes: When the stop instruction is received, transmission of the first downlink data received from the first host device to the device device using the one or more first communication pipes may be stopped. The communication control unit transfers the first downlink data received from the first host device via the one or more first communication pipes to the second host device via the one or more second communication pipes. May be.

  The communication control unit transmits the second downlink data received from the second host device via the one or more second communication pipes to the device device via the one or more first communication pipes. May be.

  In a second aspect of the present invention, there is provided a communication system comprising a computer having a host function and a communication device that communicates with the computer, wherein the communication device includes a first device function unit that communicates with the host device; A second device function unit that communicates with the computer; a host function unit that communicates with a device device; the first downlink data received by the first device function unit from the host device; and the second device function unit There is provided a communication system including a communication control unit that transmits second downlink data received from a computer to the device device via the host function unit.

  According to a third aspect of the present invention, there is provided a communication method executed by a communication device connected to the first host device, the second host device, and the device device, wherein the first downlink data is received from the first host device. Receiving the second downlink data from the second host device, the first downlink data received from the first host device, and the second downlink data received from the second host device to the device device And a step of transmitting.

  According to a fourth aspect of the present invention, there is provided a program executed by a computer included in a communication device connected to the first host device, the second host device, and the device device, wherein the first downlink data is received from the first host device. Receiving the second downlink data from the second host device; receiving the first downlink data received from the first host device; and the second downlink data received from the second host device as the device. And a step of transmitting to the apparatus.

  According to the present invention, it is possible to simultaneously connect a device device to a plurality of host devices.

It is a figure which shows the structure of the communication system which concerns on 1st Embodiment. It is a figure which shows the structure of a communication apparatus. It is a figure which shows an example of a routing table. It is a schematic diagram which shows the relationship between an application and a communication pipe. It is a schematic diagram for demonstrating interruption operation | movement. FIG. 11 is a sequence diagram when an interrupt operation occurs. It is a schematic diagram for demonstrating operation | movement of data absorption and transfer mode. It is a sequence diagram in a data absorption / transfer mode. It is a schematic diagram for demonstrating data insertion mode. It is a sequence diagram in data insertion mode.

<First Embodiment>
[Outline of Communication System S]
FIG. 1 is a diagram illustrating a configuration of a communication system S according to the first embodiment. The communication system S includes a communication device 1, a host device under test 2, an external host device 3, a device device under test 4, and a host control device 5. The host device under test 2 and the external host device 3 are USB host devices, and the device under test 4 is a USB device device. The host device controls the device device when performing data communication with the device device. The device device performs data communication with the host device based on control from the host device.

  In this embodiment, the case where the host device under test 2, the external host device 3, and the device under test device 4 are devices having a USB interface will be described. However, the host device under test 2, the external host device 3, and the device under test are described. The device 4 is not limited to a device having a USB interface. The host device under test 2 and the external host device 3 have a function of controlling the device under test 4 during data communication, and the device under test 4 is based on the control of the host device under test 2 or the external host device 3. As long as it has a function of performing data communication, the host device under test 2, the external host device 3, and the device under test device 4 may be devices that perform data communication via an interface other than the USB interface.

  The communication device 1 is connected to the host device under test 2, the external host device 3, and the device under test 4. The communication apparatus 1 connects the device under test 4 simultaneously with the host device under test 2 and the external host device 3 and performs data communication between the device under test 4 and the host device under test 2. Data communication can be performed between the device under test 4 and the external host device 3. The communication device 1 is also called a USB emulator because it emulates the interface function on the USB host side and the interface function on the USB device side. Details of the communication device 1 will be described later.

  The host device under test 2 has an interface on the USB host device side, and can send and receive data to and from the device under test device 4 having an interface on the USB device device side. When it is necessary to investigate or test the host device under test 2 or the device under test 4, the communication device 1 is connected between the host device under test 2 and the device under test 4 as shown in FIG. The host device under test 2 and the device under test device 4 transmit and receive data via the communication device 1. The host device under test 2 is a power smart meter, vending machine, vehicle operation management device (digital tachometer), remote monitoring and control device, monitoring camera, emergency call device, or the like. Then, the data is transmitted to an external device such as a server provided in a data collection center or the like via the device under test 4 and the mobile phone network.

  The external host device 3 has an interface on the USB host device side like the host device under test 2, and can send and receive data to and from the device under test device 4 via the communication device 1. The external host device 3 is, for example, a device used to check whether the data communication status between the host device under test 2 and the device under test 4 is normal. The internal log data of the test device device 4 can be acquired.

  The device under test 4 has an interface on the USB device device side. The device under test 4 is a communication module for transmitting, for example, data received from the host under test 2 to the mobile phone network and transmitting data received via the mobile phone network to the host under test 2. . The device under test 4 can execute at least a first application executed when communicating with the host under test 2 and a second application executed when communicating with the external host device 3.

  The host control device 5 is, for example, a computer, and controls the communication device 1 or displays data received via the communication device 1. The connection interface between the host controller 5 and the communication device 1 is arbitrary. For example, the host controller 5 can communicate with the communication device 1 via a serial communication interface.

[Configuration of Communication Device 1]
FIG. 2 is a diagram illustrating a configuration of the communication device 1. The communication device 1 includes a first device function unit 11, a second device function unit 12, a host function unit 13, a reception unit 14, a storage unit 15, and a communication control unit 16.
The first device function unit 11 has a USB device function for communicating with the host apparatus 2 under test. The second device function unit 12 has a USB device function for communicating with the external host device 3. The first device function unit 11 and the second device function unit 12 have equivalent functions, the external host device 3 is connected to the first device function unit 11, and the host under test is connected to the second device function unit 12. The device 2 may be connected. The host function unit 13 has a USB host function for communicating with the device under test 4.

  The accepting unit 14 receives a control signal for controlling the communication device 1 output from the host control device 5. The receiving unit 14 notifies the communication control unit 16 of the received control signal.

  The storage unit 15 includes a storage medium such as a ROM (Read Only Memory) and a RAM (Random Access Memory). The storage unit 15 stores a program executed by the communication control unit 16 and data used when the communication control unit 16 operates. The storage unit 15 stores, for example, identification information of one or more first communication pipes used for transmission / reception of first data transmitted / received between the host device under test 2 and the device under test 4, the host device under test 2. And stored as a routing table in association with the device under test 4. The storage unit 15 also stores identification information of one or more second communication pipes used for transmission / reception of second data transmitted / received between the external host device 3 and the device under test 4, and the external host device 3 and the device under test. In association with the test device apparatus 4, it is stored as a routing table.

  Here, the communication pipe refers to a logical connection configured in a physical connection via a USB interface. When the host device under test 2 and the device under test 4 communicate, the first communication pipe is used. When the external host device 3 communicates with the device under test 4, the second communication pipe is used. used. When a plurality of applications transmit and receive data between the host device under test 2 and the device under test 4 or between the external host device 3 and the device under test 4, a communication pipe is allocated for each application.

  FIG. 3 is a diagram illustrating an example of the routing table stored in the storage unit 15. In the routing table, a host device ID, a host device application ID, a device device ID, a device device application ID, and a communication pipe ID are associated with each other.

The host device ID is identification information for identifying each of the host device under test 2 and the external host device 3. In FIG. 3, the host device ID of the host device 2 under test is “1”, and the host device ID of the external host device 3 is “2”.
The host device application ID is identification information for specifying an application that is executed by the host device under test 2 and the external host device 3 and that transmits / receives data to / from an application executed by the device device under test 4. Each of the host device under test 2 and the external host device 3 can simultaneously execute a plurality of applications.

  The device apparatus ID is identification information for identifying the device under test 4. In the present embodiment, the device device connected to the communication device 1 is only the device under test 4, and therefore the device device ID is only “1” in FIG. 3, but the communication device 1 is a plurality of devices. When connected to a device, the device table ID other than “1” is included in the routing table.

  The device device application ID is identification information for specifying an application executed by the device under test 4 and executed by the host device under test 2 and an application that transmits and receives data between the application executed by the external host device 3. It is. The device under test 4 can simultaneously execute a plurality of applications. In the example illustrated in FIG. 3, the device device application IDs of the applications of the device under test 4 that communicate with the applications of the host device application ID “1h”, “2h”, and “3h” are “1d”, “2d” and “3d”.

The communication pipe ID is identification information for identifying a communication pipe used when data is transmitted / received between the host device under test 2 and the device under test 4 and between the external host device 3 and the device under test 4. . In the example shown in FIG. 3, applications with host device application IDs “1h”, “2h”, and “3h” use communication pipes with communication pipe IDs “1”, “2”, and “3”. It can be seen that data is transmitted / received to / from applications having device device application IDs “1d”, “2d”, and “3d”.
As described above, the storage unit 15 stores identification information of one or more first communication pipes in association with the host device under test 2 and the first application, and stores one or more first communication pipes in association with the external host device 3 and the second application. 2 The identification information of the communication pipe is stored.

  FIG. 4 is a schematic diagram illustrating a relationship between an application and a communication pipe. In the example shown in FIG. 4, the first application (application # 1h) executed by the host under test device 2 and the first application (application # 1d) executed by the device under test device 4 use the communication pipe # 1. Send and receive data. Similarly, the second application (application # 2h) executed by the external host device 3 and the second application (application # 2d) executed by the device under test 4 transmit and receive data using the communication pipe # 2.

  Before establishing the state shown in FIG. 4, the communication control unit 16 uses identification information of one or more communication pipes # 1 used for communication with the host apparatus 2 under test and communication with the external host apparatus 3. The above-described identification information of the communication pipe # 2 is notified to the device under test 4. The device under test 4 can transmit / receive data to / from the host device under test 2 and the external host device 3 using the notified communication pipe.

  Returning to FIG. 2, the communication control unit 16 will be described. The communication control unit 16 refers to the routing table stored in the storage unit 15 and controls the connection state between the host device under test 2 and the external host device 3 and the device under test 4. First, when the communication control unit 16 starts communication between the device under test 4 and the host under test 2, the communication control unit 16 uses one or more first devices used for communication between the device under test 4 and the host under test 2. The communication pipe identification information is exchanged with the device under test 4 and the host under test 2. In addition, the communication control unit 16 starts one or more second communication pipes used for communication between the device under test 4 and the external host device 3 when starting communication between the device under test 4 and the external host device 3. Is exchanged with the device under test 4 and the external host device 3.

  When the communication between the device under test 4 and the host device under test 2 is started and the communication between the device under test 4 and the external host device 3 is started, the communication control unit 16 starts the communication with the first device function unit 11. The first downlink data received from the host device under test 2 and the second downlink data received by the second device function unit 12 from the external host device 3 are transmitted to the device under test device 4 via the host function unit 13.

At this time, the communication control unit 16 transmits the first downlink data received via the first device function unit 11 to the device under test 4 using one or more first communication pipes, and the second device function unit The second downlink data received from 12 is transmitted to the device under test 4 using one or more second communication pipes. Further, the communication control unit 16 transmits the first uplink data among the uplink data received by the host function unit 13 to the host device under test 2 via the first device function unit 11, and the second uplink data. Then, the data is transmitted to the external host device 3 via the second device function unit 12.
Hereinafter, various operations of the communication device 1 will be described.

[Interrupt control]
FIG. 5 is a schematic diagram for explaining an interrupt operation when the external host device 3 starts communication with the device under test 4 while the host device under test 2 and the device under test 4 are communicating. . FIG. 6 is a sequence diagram when an interrupt operation occurs. FIG. 5A shows a state in which the host apparatus 2 under test and the device under test 4 communicate using two communication pipes # 1 and # 2. In this state, when the external host device 3 is connected to the communication device 1, the communication control unit 16 refers to the routing table and communicates with the device under test 4 using the third communication pipe # 3. Start.

  Specifically, the communication control unit 16 is connected to the host device under test 2 and the device under test 4 from the external host device 3 while communicating with one or more first communication pipes (communication pipes # 1 and # 2). In response to receiving the communication request, the identification information of one or more second communication pipes (communication pipe # 3) is notified to the device under test 4 to thereby provide the external host device 3 and the device under test 4 Use a communication pipe between.

  Referring to FIG. 6, first, when the host under test 2 starts communication with the device under test 4, the host under test 2 enumerates for using the communication pipe with the communication device 1. To start. Enumeration is a process for the USB host device and the USB device device to recognize each other. When the host device under test 2 which is a USB host device detects that the communication device 1 as a USB device device is connected, the host device under test 2 transmits a request message to the communication device 1 for acquiring a descriptor indicating the attribute of the communication device 1. To do. In response to receiving the request message, the communication device 1 notifies the host device under test 2 of the attributes of the communication device 1. In this way, enumeration between the host device under test 2 and the communication device 1 is completed.

  Subsequently, when the enumeration with the host apparatus under test 2 is completed, the communication control unit 16 refers to the routing table. The communication control unit 16 recognizes that it is necessary to connect the host device under test 2 and the device under test 4 and starts enumeration for using the communication pipe between the device under test 4 and the device under test 4. To do. The communication device 1 enables the communication pipe selected with reference to the routing table in enumeration. According to the routing table, since communication using two applications is performed between the host device under test 2 and the device under test 4, the communication device 1 can use two communication pipes.

  The communication device 1 can use the communication pipe # 1 with the host device 2 under test according to the above procedure. Next, the communication apparatus 1 enables the communication pipe # 1 ′ with the device under test 4. The communication pipe # 1 ′ is a communication pipe used for communication between the communication device 1 and the device under test 4 when the communication pipe # 1 is used between the communication device 1 and the host device under test 2. is there. Subsequently, the communication device 1 enables the communication pipe # 2 with the host device under test 2 and enables the communication pipe # 2 ′ with the device under test 4.

Subsequently, when the external host device 3 is connected to the communication device 1, the external host device 3 starts enumeration for making the communication pipe usable with the communication device 1. When the enumeration is completed, the communication apparatus 1 performs the enumeration with the device under test 4, enables the communication pipe # 3 with the external host device 3, and the device under test 4 Communication pipe # 3 'can be used.
By the above procedure, the first data communication using the communication pipe # 1 and the second data communication using the communication pipe # 2 between the host apparatus 2 under test and the device under test 4, and The third data communication by the application using the communication pipe # 3 between the external host device 3 and the device under test 4 can be started.

[Data absorption / transfer]
Subsequently, a data absorption / transfer mode in which the communication device 1 absorbs data received from the host device under test 2 and transfers the data to the external host device 3 without delivering it to the device device under test 4 will be described. The data absorption / transfer mode is a mode in which the communication apparatus 1 absorbs / transfers payload data in a specified direction of a communication pipe specified by a user. For example, the data absorption / transfer mode is performed between the host apparatus 2 under test and the device under test 4. Used to investigate the cause of problems that occurred in By using the data absorption / transfer mode of the communication device 1, the user can observe the operation in a state where the command transmitted by the application is temporarily stopped, for example.

  For example, the communication apparatus 1 instructs the reception unit 14 to set the data absorption / transfer mode, that is, a stop instruction to stop transmission of the first downlink data received from the host device 2 to be tested to the device device 4 to be tested. When data is accepted, the data absorption / transfer mode is activated. When the receiving unit 14 receives the stop instruction, the communication control unit 16 transmits the first downlink data received from the host device under test 2 to the device under test 4 using one or more first communication pipes. Stop. Then, the communication control unit 16 transfers the first downlink data received from the host under test 2 to 3 via one or more second communication pipes.

  FIG. 7 is a schematic diagram for explaining the operation in the data absorption / transfer mode. When the first device function unit 11 receives the data transmitted from the host device under test 2 to the device under test 4, the communication device 1 transmits the first data without transmitting the received data to the device under test 4. The function unit 11 returns to the second device function unit 12. Then, the communication device 1 transmits data received from the host device under test 2 to the external host device 3 via the second device function unit 12. By displaying the data received from the communication device 1 in the external host device 3, the user can confirm the content of the data that the host device under test 2 is transmitting to the device device under test 4. During this time, the data received by the communication apparatus 1 from the device under test 4 is transmitted to the host under test 2 as usual.

FIG. 8 is a sequence diagram in the data absorption / transfer mode. When the host device under test 2 transmits data to the device under test device 4 via the communication device 1 in the state where the data absorption / transfer mode is not activated, that is, in the inactivated state, the device under test device 4 transmits the data. An ACK message indicating reception is transmitted to the communication device 1. When the communication apparatus 1 receives the ACK message from the device under test 4, the communication apparatus 1 transmits the ACK message to the host under test 2. As a result, the host apparatus under test 2 recognizes that the transmitted data has reached the device under test apparatus 4 and transmits the next data.
The communication apparatus 1 returns the ACK message (broken arrow in FIG. 8) immediately after receiving the data from the host apparatus 2 under test, and then executes the procedure for transmitting the received data to the device under test 4. Also good.

  In contrast, when the data absorption / transfer mode is activated, that is, in the activated state, when the data transmitted from the host device 2 under test to the device under test 4 reaches the communication device 1, the communication device 1 Without transmitting the received data to the device under test 4, an ACK message is transmitted to the host device under test 2, and the received data is transferred to the external host device 3. Thereby, the host under test 2 recognizes that the transmitted data has reached the device under test 4 and transmits the next data. By transferring the data received from the host device 2 under test to the external host device 3 while the communication device 1 behaves as if it is the device device under test 4, the user can communicate with the host device 2 under test and the device under test 2. When a problem occurs in communication with the device apparatus 4, it is possible to check whether there is a problem in the data transmitted by the host apparatus 2 under test.

  In the above description, the communication device 1 transfers the data received from the host device under test 2 to the external host device 3. However, the communication device 1 receives the data received from the device device under test 4. May be transferred to the external host device 3. In this case, the communication apparatus 1 transmits an ACK message to the device under test 4 in response to receiving data from the device under test 4. Further, the communication device 1 may simply perform data absorption / discarding without transferring the data received by the communication device 1 to the host device 2 under test.

  In this way, the communication device 1 can switch between transferring data received from the host device under test 2 to the external host device 3 or transferring data received from the device device under test 4 to the external host device 3. If possible, the communication device 1 instructs the external host device 3 to switch the application and the communication pipe to be used. The external host device 3 uses a communication pipe corresponding to the application to be used in response to receiving the switching instruction.

[Data Insertion]
Next, a data insertion mode in which data transmitted by the external host device 3 is transmitted to the device under test 4 instead of data transmitted from the host under test 2 to the device under test 4 will be described. The data insertion mode is a mode for transmitting a data packet including designated payload data in a designated direction of a communication pipe designated by a user. The user can use the data insertion mode and the data absorption / transfer mode simultaneously. In the data insertion mode, the communication control unit 16 transmits the second downlink data received from the external host device 3 via one or more second communication pipes to the device under test 4 via one or more first communication pipes. Send. The communication control unit 16 may transmit the uplink data received from the device under test 4 via one or more first communication pipes to the external host device 3 via one or more second communication pipes.

  FIG. 9 is a schematic diagram for explaining the data insertion mode. When the communication apparatus 1 receives the data transmitted from the host under test 2 to the device under test 4, the communication apparatus 1 does not transmit the data transmitted from the host under test 2 to the device under test 4. The data transmitted from the external host device 3 via 1 is transmitted to the device under test 4. Further, the communication apparatus 1 does not transmit the data transmitted from the device under test 4 to the host under test 2 to the host under test 2, but transmits the data transmitted from the device under test 4 to the external host device 3. Send to. The data transmission from the external host device 3 may be performed regardless of the data transmission from the host device 2 under test.

  At this time, the external host device 3 performs data communication in the same procedure as the host device under test 2, so that the device under test device 4 is not in a state of transmitting / receiving data to / from the host device under test 2. Regardless, data communication with the external host device 3 can be performed in the same procedure as when data is transmitted to and received from the host device 2 under test. The communication device 1 transmits data received from the device under test 4 to the host control device 5 instead of the external host device 3, and the data transmitted from the host control device 5 is transmitted to the device under test 4. May be sent to.

FIG. 10 is a sequence diagram in the data insertion mode. While the data insertion mode is in the inactive state, the communication apparatus 1 transfers the data transmitted from the host device under test 2 to the device under test 4 and receives the ACK message transmitted from the device under test 4 under test. Transfer to the host device 2.
The communication device 1 returns the ACK message (broken arrow in FIG. 10) immediately after receiving the data from the host device 2 under test, and subsequently executes the procedure for transmitting the received data to the device under test 4. Also good.

  On the other hand, when the data insertion mode becomes active, the communication device 1 does not transfer the data received from the host device under test 2 to the device under test device 4 and does not transfer the data received from the external host device 3 to the device under test. It transmits to the device apparatus 4. Then, the communication apparatus 1 does not transfer the data received from the device under test 4 to the host under test 2 but transfers the received data to the external host 3. The external host device 3 displays the received data. By doing in this way, the user can confirm whether there is no problem in the data transmitted by the device under test 4.

[Effect in this embodiment]
As described above, in the communication device 1 according to the present embodiment, the first downlink data received by the first device function unit 11 from the host device under test 2 and the second device function unit 12 received from the external host device 3. The received second downlink data is transmitted to the device under test 4 via the host function unit 13. In this way, the device under test 4 that is a device device can be connected simultaneously with the host device under test 2 and the external host device 3 that are a plurality of host devices.

  Further, the communication control unit 16 responds to the device under test 4 with respect to the device under test 4 in response to receiving a communication request from the external host device 3 during communication between the host under test 2 and the device under test 4. The communication pipe identification information used for communication with the test device apparatus 4 is notified. By doing so, the user connects the external host device 3 when a problem occurs in the communication state between the host device under test 2 and the device under test 4, and the host device under test 2 and the device under test are connected. It becomes possible to monitor the communication state with the device 4.

  Further, the communication control unit 16 receives the data received from the host under test 2 in response to receiving a stop instruction for stopping transmission of the data received from the host under test 2 to the device under test 4. Transmission to the device under test 4 is stopped. The communication control unit 16 transfers the data received from the host device under test 2 to the external host device 3. By doing so, the user observes the contents of the data received from the host device 2 under test in the external host device 3, and solves the problem that has occurred between the host device 2 under test and the device device under test 4. The cause can be analyzed.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above embodiment. In particular, the specific embodiments of the distribution / integration of the devices are not limited to those illustrated above, and all or a part thereof may be added in arbitrary units according to various additions or according to functional loads. It can be configured functionally or physically distributed and integrated.

  For example, in the above description, the communication device 1 is connected to two USB host devices and connected to one USB device device. However, the USB host device and the USB device device that can be connected to the communication device 1 have been described. The number of is not limited to this. The communication device 1 may be configured to be connected to three or more USB host devices and connected to two or more USB device devices.

  In the above description, the example in which the communication device 1 mainly performs data processing such as data absorption / transfer and data insertion with respect to one communication pipe has been described. Data processing such as data absorption / transfer and data insertion may be performed on the pipe. Further, in data transfer in data absorption / discard or data transmission in data insertion, the same data can be transmitted to a plurality of communication pipes.

DESCRIPTION OF SYMBOLS 1 Communication apparatus 2 Host apparatus to be tested 3 External host apparatus 4 Device apparatus to be tested 5 Host control apparatus 11 First device function section 12 Second device function section 13 Host function section 14 Reception section 15 Storage section 16 Communication control section S Communication system

Claims (13)

A first device function unit that communicates with the first host device;
A second device function unit that communicates with the second host device;
A host function unit that communicates with the device device;
The first downlink data received by the first device function unit from the first host device and the second downlink data received by the second device function unit from the second host device are transmitted via the host function unit. A communication control unit for transmitting to the device device;
A communication device. The host function unit receives uplink data received from the device device,
The communication control unit transmits first uplink data among the uplink data received by the host function unit to the first host device via the first device function unit, and second uplink data, Transmitting to the second host device via the second device function unit;
The communication apparatus according to claim 1. The communication control unit transmits the first downlink data received via the first device function unit to the device apparatus using one or more first communication pipes and receives the first downlink data from the second device function unit. Transmitting the second downlink data to the device device using one or more second communication pipes;
The communication apparatus according to claim 1 or 2. The identification information of the one or more first communication pipes used for transmission / reception of first data transmitted / received between the first host device and the device device is stored in association with the first host device and the device device. The identification information of the one or more second communication pipes used for transmission / reception of second data transmitted / received between the second host device and the device device is associated with the second host device and the device device. A storage unit for storing
The communication apparatus according to claim 3. The device apparatus executes at least a first application and a second application,
The storage unit stores identification information of the one or more first communication pipes in association with the first host device and the first application, and associates with the one or more first communication devices in association with the second host device and the second application. Storing identification information of the second communication pipe;
The communication apparatus according to claim 4. The communication control unit includes identification information of the one or more first communication pipes used for communication with the first host device and identification of the one or more second communication pipes used for communication with the second host device. Inform the device device of information,
The communication apparatus according to any one of claims 3 to 5. The communication control unit receives the communication request from the second host device during communication between the first host device and the device device via the one or more first communication pipes. To notify the identification information of the one or more second communication pipes;
The communication apparatus according to claim 6. A reception unit that receives a stop instruction to stop transmission of the first downlink data received from the first host device to the device device;
The communication control unit stops transmission of the first downlink data received from the first host device to the device device using the one or more first communication pipes when the receiving unit receives the stop instruction. To
The communication apparatus according to any one of claims 3 to 7. The communication control unit transfers the first downlink data received from the first host device via the one or more first communication pipes to the second host device via the one or more second communication pipes. To
The communication apparatus according to claim 8. The communication control unit transmits the second downlink data received from the second host device via the one or more second communication pipes to the device device via the one or more first communication pipes;
The communication apparatus according to claim 8 or 9. A communication system comprising a computer having a host function and a communication device that communicates with the computer,
The communication device
A first device function unit that communicates with the host device;
A second device function unit that communicates with the computer;
A host function unit that communicates with the device device;
The first device function unit transmits first downlink data received from the host device and the second device function unit transmits second downlink data received from the computer to the device device via the host function unit. A communication control unit;
A communication system. A communication method executed by a communication device connected to a first host device, a second host device, and a device device,
Receiving first downlink data from the first host device;
Receiving second downlink data from the second host device;
Transmitting the first downlink data received from the first host device and the second downlink data received from the second host device to the device device;
A communication method. A program executed by a computer included in a communication device connected to the first host device, the second host device, and the device device,
Receiving first downlink data from the first host device;
Receiving second downlink data from the second host device;
Transmitting the first downlink data received from the first host device and the second downlink data received from the second host device to the device device;
A program with

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