JP2018157466A - Telegram transmitting/receiving system, telegram transmitting apparatus, telegram receiving apparatus, and telegram transmitting/receiving method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless communication system using different wireless communication schemes enabling smooth wireless communication.SOLUTION: The telegram transmission/reception system includes: a telegram transmission apparatus and a telegram reception apparatus. The telegram transmission apparatus includes: a transmission unit for transmitting a request telegram to the telegram reception apparatus; and a determination unit that determines whether transmission of a second request telegram is permitted on the basis of transmitted telegram information for recording a first request telegram to which a corresponding response telegram is not transmitted from the telegram reception apparatus among the transmitted first request telegrams.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a message transmission / reception system, a message transmission device, a message reception device, a message transmission / reception method, and a program.

  Conventionally, in various fields such as business processing, a message guarantee type message transmission / reception system that guarantees message arrival at a transmission destination has been proposed. The message guarantee control is performed in the transmission side system and the reception side system. The transmission-side system stores the transmission message in a storage area such as a database, reads out the message from the database at regular intervals, and repeats retransmission until a response reception from the transmission destination is confirmed. For example, when the receiving side system receives a request message while executing the business processing program, the transmitting side system repeats the retransmission of the request message until a reception confirmation response message is received from the receiving side system. When the message retransmission is repeated, the receiving system may fall into a high load state due to unnecessary message reception processing. For this reason, a technique has been proposed in which double processing of a message is inspected and a response message is transmitted.

  The processing system described in Patent Literature 1 determines the duplex processing based on whether or not the business (transaction) processing program on the received message has been executed. If it has not been executed, the receiving system executes the business processing program and records a response message created based on the processing result in the storage file. If the business process program has been executed, the receiving system transmits a registered response message without executing the business process program. The transmission side system retransmits a request message, for which the reception response has not been confirmed, at regular time intervals.

JP 2005-150465 A

  However, in the system described in Patent Document 1, even if the telegram receiving device is executing the business processing program, the telegram transmitting device can repeatedly retransmit the telegram. For this reason, the processing load of the message reception in the message reception device has been excessive. In addition, the message transmission apparatus also has a problem that processing efficiency deteriorates due to the repeated retransmission processing. The present invention has been made in view of the above-described problems, and an object of the present invention is to reduce a processing burden required for retransmission of a message in a message-guaranteed message transmission / reception system.

  According to an aspect of the present invention, there is provided a message transmission / reception system including a message transmission device and a message reception device, the message transmission device including a transmission unit that transmits a request message to the message reception device, and a first that has been transmitted. A determination unit that determines whether or not the second request message can be transmitted based on transmission message information that records the first request message in which a corresponding response message is not transmitted from the message reception device. A telegram transmission / reception system characterized by comprising:

  According to another aspect of the present invention, the transmission unit that transmits the request message to the message receiving device and the first response message that has been transmitted, the corresponding response message is not transmitted from the message receiving device. There is provided a message transmission device comprising: a determination unit that determines whether or not a second request message can be transmitted based on transmission message information that records one request message.

  According to still another aspect of the present invention, there is provided a message reception device that transmits a response message corresponding to a request message transmitted from a message transmission device to the message transmission device, and is not transmitted to the message transmission device. There is provided a message receiving apparatus comprising a response transmission unit that determines whether or not the response message can be transmitted based on response message information that records a response message.

  According to another aspect of the present invention, there is a message transmission / reception method in a message transmission apparatus and a message reception apparatus, the step of transmitting a request message to the message reception apparatus by the message transmission apparatus, and the transmission by the message transmission apparatus Among the first request messages, a message indicating whether or not the second request message can be transmitted based on transmission message information that records the first request message for which the corresponding response message has not been transmitted from the message receiver. And a step of determining by a transmitting device.

  According to another aspect of the present invention, a request message is transmitted from the message transmission device to the message reception device, and a corresponding response message is transmitted from the message reception device among the transmitted first request messages. And a step of determining whether or not the second request message can be transmitted based on the transmitted message information for recording the first request message that does not exist.

  According to another aspect of the present invention, a request message is transmitted from the message transmission device to the message reception device, and a corresponding response message is transmitted from the message reception device among the transmitted first request messages. There is provided a program for causing a computer to execute a message transmission method comprising: determining whether or not transmission of a second request message is possible based on transmission message information for recording the first request message that is not present.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to reduce the processing burden required for the resending of a message | telegram in a message | telegram guarantee type | mold message transmission / reception system.

It is a hardware block diagram of the message | telegram transmission / reception system in 1st Embodiment. It is a functional block diagram of the message | telegram transmission / reception system in 1st Embodiment. It is a figure of the message | telegram format in 1st Embodiment. It is a figure of the message | telegram format of the reception response in 1st Embodiment. It is a figure of the transmission message | telegram table | surface in 1st Embodiment. It is a figure of the response message table in a 1st embodiment. It is a flowchart of the request | requirement message | telegram transmission part in 1st Embodiment. It is a flowchart of the response message | telegram transmission part in 1st Embodiment. It is a flowchart of the response process part in 1st Embodiment. It is a flowchart of the resending process part in 1st Embodiment. It is a flowchart of the double transmission determination part in 1st Embodiment. It is a schematic block diagram of the message | telegram transmission apparatus in 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a hardware block diagram of a message transmission / reception system according to this embodiment. The message transmission / reception system includes a message transmission device 10 and a message reception device 20 connected to each other via a communication path 30. The electronic message transmission / reception system can be used in various fields such as an internal / external business system, a settlement system in a financial institution, a management system between stores, and a control system for a transportation system such as an aircraft. Moreover, the message | telegram transmission apparatus 10 and the message | telegram reception apparatus 20 are only what distinguished the transmission side and the reception side regarding a certain specific message | telegram, and all can be provided with the function of transmission / reception.

  The message transmission device 10 includes a bus 11, a CPU (Central Processing Unit) 12, a ROM (Read Only Memory) 13, a RAM (Random Access Memory) 14, a storage device (HDD: Hard Disk Drive) 15, a communication interface (I / F). : Interface) 16, keyboard 17, and display 18.

  The CPU 12 executes message transmission / reception processing and business processing in accordance with a predetermined application program. The application program may be written in the ROM 13 or downloaded from a server not shown. The RAM 14 provides a memory area necessary for the operation of the CPU 12. The storage device 15 can store messages, transmission message tables, business data, and the like. The communication interface 16 includes a transmission / reception circuit and a protocol conversion circuit, and can transmit / receive data such as a telegram through the communication path 30. The keyboard 17 is used for inputting messages, operating business processing programs, and the like. The display 18 includes a liquid crystal display, an organic light emitting display, and the like, and performs display related to electronic messages and business processing.

  The message receiver 20 is configured in the same manner as the message transmitter 10 and includes a bus 21, a CPU 22, a ROM 23, a RAM 24, a storage device 25, a communication interface 26, a keyboard 27, and a display 28. The communication path 30 may be a dedicated line of a telegram transmission / reception system or a public line. It does not matter whether the communication path 30 is a wired line or a wireless line.

  FIG. 2 is a functional block diagram of the message transmission / reception system in the present embodiment, which is realized by the hardware shown in FIG. The message transmission device 10 includes a business processing unit 110, a request message transmission unit 120, a duplex transmission determination unit 130, a retransmission processing unit 140, a response processing unit 150, and a transmission message table 160.

  The job processing unit 110 creates a message to be transmitted to the message receiving device 20 while processing a predetermined job according to the application program. The request message transmission unit 120 creates a request message from the data output from the business processing unit 110 according to a predetermined message format. The request message transmission unit 120 inquires of the double transmission determination unit 130 whether or not the created message can be transmitted. When the double transmission determination unit 130 permits transmission, the request message transmission unit 120 transmits a message to the message reception device 20 and registers the message in the transmission message table 160. When the double transmission determination unit 130 determines that transmission is not possible, the request message transmission unit 120 discards the request message.

  The double transmission determination unit 130 determines whether or not a message transmission is possible in response to an inquiry from the request message transmission unit 120 or the retransmission processing unit 140. The double transmission determination unit 130 determines whether or not the message transmission is possible by determining whether or not the same message body as the determination target message is included in the messages already transmitted in the transmission message table 160 described later. To do. That is, when the same message body exists in the transmission message table 160, the double transmission determination unit 130 determines that the determination target message cannot be transmitted. On the other hand, when the same message body does not exist in the transmission message table 160, the double transmission determination unit 130 determines that the determination target message can be transmitted. For example, even if the response to the first request message is not confirmed, if the business processing unit 110 transmits the same request message a plurality of times, the load on the reception processing in the message receiving device 20 becomes excessive. . Moreover, the processing load of the message re-transmission repeatedly performed also in the message transmission apparatus 10 may increase. Furthermore, in the communication path 30, there is a possibility that communication traffic may be compressed by a large amount of re-transmission text. According to this embodiment, the processing load of the message transmission / reception system can be reduced by restricting retransmission of the same request message in this way.

  The retransmission processing unit 140 is activated every predetermined time from the start of the operation of the message transmission device 10 and executes retransmission processing according to the determination of whether or not retransmission can be performed by the double transmission determination unit 130. That is, the retransmission processing unit 140 reads a message whose response from the message receiving device 20 is unconfirmed in the transmission message table 160 and transmits the message to the message receiving device 20.

  The response processing unit 150 receives two types of response messages returned from the message receiving device 20 and performs processing corresponding to each message. The first response message is a reception response message that is returned when the request message is received. When receiving the reception response message, the response processing unit 150 deletes the request message corresponding to the reception response message from the transmission message table 160, and stops the message retransmission. The second response message is a business response message that returns the business processing result of the message receiving device 20. When receiving the business response message, the response processing unit 150 causes the business processing unit 110 to execute processing according to the business response message.

  The transmission message table 160 is a data record that records a message that has not been received, and is stored in the storage device 15, for example. The message recorded in the transmission message table 160 is read out and retransmitted by the retransmission processing unit 140 described later. The transmitted message table 160 may include a message ID for uniquely identifying a message, and information indicating whether or not a message can be transmitted.

  The message receiving device 20 includes a business processing unit 210, a response transmission unit 220, and a response message table 230. The business processing unit 210 executes predetermined business processing according to the received request message. The response transmission unit 220 performs processing such as transmission of a message confirming reception of the request message, determination of duplex processing, output of a request message to the job processing unit 210, and transmission of a response message from the job processing unit 210. Do. The response message table 230 records a business response message to be returned to the message transmitter 10. When the message receiver 20 receives a request message that has been executed, the response transmitter 220 reads the job response message from the response message table 230 and returns it to the message transmitter 10. The message receiving device 20 can determine the duplex processing based on the response message table 230.

  FIG. 3 shows an example of a message format in the present embodiment. The message format includes a message classification, a message ID, a business process result, and a message body. The message classification represents the type of message, and for example, “request”, “reception response”, and “business response” are defined. The request message is a message for requesting the predetermined message processing from the message transmission device 10 to the message reception device 20, and the reception response message is a message transmitted from the message reception device 20 to the message transmission device 10 in response to the request message. is there. The business response message is a message that returns the result of the business process to the request message. The message ID is an identifier uniquely assigned to the message, and is used to identify a message to be transmitted / received. For example, numerical values in ascending order or descending order may be assigned to the message IDs according to the order in which the messages are created. Thereby, by referring to the message ID, it is possible to determine before and after the creation time of the two messages. The business process result represents a result of the business process performed by the business processing unit 110, and is information such as “OK” and “NG”, for example. The message body is text data added to each message.

  FIG. 4 shows an example of a reception response message format in the present embodiment. The reception response message is a message for notifying the message transmission device 10 that the message reception device 20 has received the message. The reception response message may include a message ID and message classification information. The message ID is unique data such as the identification number of the received message, and the message classification defines “reception response”.

  FIG. 5 shows a transmission telegram table in the present embodiment. The transmission message table 160 is transmission message information for recording a message that has not yet been confirmed, and includes information on a message ID, a message body, and a determination result. The message ID represents the identification number of the transmitted request message, and the message body represents the message of the request message transmitted by the message transmission device 10. The determination result indicates whether the request message can be transmitted, and is set by the double transmission determination unit 130. That is, the duplex transmission determination unit 130 determines whether or not the determination target message is the same as the message having the message ID created at the time before the message ID. If both are the same, the double transmission determination unit 130 sets the determination result to “not transmittable”, and if both are different, sets the determination result to “transmittable”. When the determination result is “transmittable”, transmission of a message by the request message transmission unit 120 and the retransmission processing unit 140 is permitted. On the other hand, when the determination result is “transmission impossible”, transmission of a message by the request message transmission unit 120 and the retransmission processing unit 140 is restricted.

  FIG. 6 is a diagram of the response message table 230 in the present embodiment. The response message table 230 is response message information for determining double transmission in the message receiver 20, and includes a message ID and information of the response message body. The message ID represents the identification number of the response message, and the response message main body represents the message of the response message transmitted by the message receiver 20.

  FIG. 7 is a flowchart showing the operation of the request message transmission unit 120. First, the task processing unit 110 processes a predetermined task and creates a message body addressed to the message receiver 20. The request message transmission unit 120 creates a request message according to the message format shown in FIG. 3 using the message body from the business processing unit 110 (step S101). In the message format, the request message transmission unit 120 sets “request” for the message classification, and sets a unique identification number in the message transmission / reception system for the message ID. A message message created by the business processing unit 110 is set in the message body.

  The request message transmission unit 120 inquires of the double transmission determination unit 130 whether the request message can be transmitted (step S102), and registers the request message in the transmission message table 160 (step S103). The double transmission determination unit 130 determines whether the request message can be transmitted, and registers the determination result in the transmission message table 160. Subsequently, the request message transmission unit 120 refers to the transmission message table 160. If the determination result can be transmitted (YES in step S104), the request message transmission unit 120 transmits the request message to the message reception device 20 (step S105). When the determination result cannot be transmitted (NO in step S104), the request message transmission unit 120 discards the request message and ends the process.

  FIG. 8 is a flowchart showing the operation of the double transmission determination unit 130. In response to an inquiry from request message transmission unit 120 or retransmission processing unit 140, double transmission determination unit 130 starts determination of double transmission. The double transmission determination unit 130 compares the message body of the request message scheduled to be transmitted with the message body recorded in the transmission message table 160 (step S201). The double transmission determination unit 130 searches for a request message having a message ID created at a time before the message ID of the request message scheduled to be transmitted. Before and after the time of the message ID, as described above, for example, the size of the message ID number can be determined. Next, the double transmission determination unit 130 determines whether or not there is a request message having the same message body as the request message scheduled to be transmitted in one or more searched request messages. If the same request message exists in the transmission message table 160 (YES in step S202), the double transmission determination unit 130 sets the determination result in the transmission message table 160 to “transmission disabled” (step S204). When the same request message does not exist in the transmission message table 160 (NO in step S202), the double transmission determination unit 130 sets the determination result in the transmission message table 160 to “transmittable” (step S203). The request message transmission unit 120 and the double transmission determination unit 130 perform a request message transmission or cancellation process based on the determination result in the transmission message table 160.

  FIG. 9 is a flowchart showing the operation of the response transmission unit 220. When receiving a message from the message transmission device 10, the response transmission unit 220 of the message reception device 20 determines whether or not the message is a request message. The response transmission unit 220 determines whether or not the message classification of the received message is “request”. When the received message is a request message, the following processing is started. First, the response transmission unit 220 creates a response message for the request message and transmits it to the message transmission device 10 (step S301). As shown in FIG. 4, the reception response message includes information on a message classification and a message ID. “Reception response” is set in the message classification, and the message ID of the reception message corresponding to the response message is set in the message ID.

  Next, the response transmission unit 220 searches the response message table 230 using the message ID of the received message as a key, and determines whether there is a response message corresponding to the received message (step S302). If there is no response message corresponding to the received message (NO in step S302), the response transmission unit 220 activates the task processing unit 210 (step S303). The business processing unit 210 performs business processing according to the request message and creates a response message. Upon receiving the response message from the business processing unit 210, the response transmission unit 220 creates a business response message according to the message format shown in FIG. 3 (step S304). “Business response” is set in the message classification, and the message ID of the received message is set in the message ID. In the business processing result, either “OK” or “NG” is set as a processing result by the business processing unit 210. The response transmission unit 220 registers the created business response message in the response message table (step S305) and transmits it to the message transmission device 10 (step S307). On the other hand, if there is a response message corresponding to the received message in step S302 (YES in step S302), the response transmission unit 220 reads the message from the response message table 230 and transmits it to the message transmission device 10 (step S302). S307).

  FIG. 10 is a flowchart showing the operation of the response processing unit 150. When receiving the response message from the message receiving device 20, the response processing unit 150 of the message transmitting device 10 determines the type of the response message based on the message classification (step S401). When the message classification of the response message is “reception response”, the response processing unit 150 deletes the request message corresponding to the response message from the transmission message table 160 (step S402). As a result, the request message for which the reception response has been made is not retransmitted. When the message classification of the response message is “business response”, the response processing unit 150 activates the business processing unit 110, and the business processing unit 110 executes the business processing based on the response message (step S403).

  FIG. 11 is a flowchart showing the operation of the retransmission processing unit 140. The retransmission processing unit 140 is activated at regular intervals from the time of activation of the message transmission device 10 based on a timer. When the retransmission processing unit 140 is activated, first, one message is read from the transmitted message table 160 (step S501). Next, the retransmission processing unit 140 inquires of the double transmission determination unit 130 whether or not the read message can be transmitted (step S502). When determining that the message can be transmitted (YES in step S503), the double transmission determination unit 130 updates the determination result of the message to “transmittable” in the transmission message table 160 (step S504). The retransmission processing unit 140 retransmits the request message to the message receiving device 20 according to the determination result of the transmission message table 160 (step S505). On the other hand, when the duplex transmission determination unit determines that the message cannot be transmitted (NO in step S503), the message determination result remains in the “transmission disabled” state in the transmission message table 160. That is, when a message having the same message body as the message to be determined exists in the transmission message table 160, it can be determined that the response message has not yet been returned from the message reception device 20. In order to reduce the processing burden on the message receiving device 20, the retransmission processing unit 140 ends the process without retransmitting the message.

  The retransmission processing unit 140 repeatedly executes the above processing for every message in the transmission message table 160 every predetermined time. During this time, when a response message is returned to the request message registered in the transmission message table 160, the request message is deleted from the transmission message table 160, and retransmission is stopped. Moreover, when the response message is not returned with respect to the transmitted request message, it is possible to reduce the processing load on the message reception device 20 by limiting retransmission.

  As described above, according to the present embodiment, it is possible to reduce the processing burden required for retransmission of a message in a message-guaranteed message transmission / reception system by determining whether or not retransmission is possible using the transmission message table. It becomes. That is, it is possible to reduce the processing load of the retransmitted message in the message receiving device 20, and the message transmitting device 10 does not have to repeat retransmission of the message, so the processing load in the message transmitting device 10 can be reduced. It is. Furthermore, the amount of communication on the communication path 30 can be reduced, and high-speed processing can be performed in the entire message transmission / reception system.

[Second Embodiment]
FIG. 12 is a schematic configuration diagram of a message transmission device according to the present embodiment. The message transmission device 10 according to this embodiment includes a transmission unit 101 and a determination unit 102. The transmission unit 101 transmits a request message to the message reception device. The determination unit 102 transmits the second request message based on the transmission message information that records the first request message in which the corresponding response message is not transmitted from the message reception device among the transmitted first request messages. Determine whether or not. According to the present embodiment, it is possible to reduce the processing burden required for retransmitting a message in a message-guaranteed message transmission / reception system by determining whether retransmission is possible using the transmission message information.

[Other Embodiments]
The present invention can be implemented in various modes without departing from the spirit of the invention. For example, the transmission message table 160 and the response message table 230 do not necessarily need to be tabular data, and may be information in various formats. If the duplex transmission determination unit 130 determines that transmission of a message is not possible, transmission may be limited, for example, by reducing the frequency of message retransmission without completely prohibiting transmission of the message.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
A message transmission / reception system comprising a message transmission device and a message reception device,
The message transmission device
A transmission unit for transmitting a request message to the message reception device;
Based on the transmission message information that records the first request message for which the corresponding response message has not been transmitted from the message reception device among the transmitted first request messages, whether or not the second request message can be transmitted is determined. A determination unit for determining;
A message transmission / reception system comprising:

(Appendix 2)
A transmission unit for transmitting a request message to the message reception device;
Based on the transmission message information that records the first request message for which the corresponding response message has not been transmitted from the message reception device among the transmitted first request messages, whether or not the second request message can be transmitted is determined. A determination unit for determining;
A message transmission device comprising:

(Appendix 3)
The message according to claim 2, wherein the determination unit restricts transmission of the second request message having the same message body as the message body of the first request message included in the transmission message information. Transmitter device.

(Appendix 4)
When the said determination part receives the said response message from the said message receiver, the said 1st request message corresponding to the said response message is deleted from the said transmission message information, The additional statement 2 or 3 characterized by the above-mentioned. A message transmission device.

(Appendix 5)
The message transmission apparatus according to any one of appendices 2 to 4, wherein the transmission message information further includes an identifier that is unique to the request message.

(Appendix 6)
The identifier includes information capable of determining before and after the creation time of each of the first and second request messages.
The determination unit extracts the second request message created at a time before the second request message from the transmission message information based on the identifier, and determines whether or not the second request message can be transmitted. The message transmitting device according to appendix 5, wherein the message transmitting device is determined.

(Appendix 7)
A message receiver that transmits a response message corresponding to a request message transmitted from a message transmitter to the message transmitter,
A message receiving device comprising: a response transmission unit that determines whether or not the response message can be transmitted based on response message information that records the response message that has not been transmitted to the message transmission device.

(Appendix 8)
A message transmission / reception method in a message transmission apparatus and a message reception apparatus,
Transmitting a request message to the message receiver by the message transmitter;
Based on the transmission message information that records the first request message in which the corresponding response message is not transmitted from the message reception device among the first request messages transmitted by the message transmission device, the second request message Determining whether or not transmission is possible by the message transmission device;
A message transmission / reception method comprising:

(Appendix 9)
Transmitting a request message from the message transmitting device to the message receiving device;
Based on the transmission message information that records the first request message for which the corresponding response message has not been transmitted from the message reception device among the transmitted first request messages, whether or not the second request message can be transmitted is determined. A determining step;
A message transmission method comprising:

(Appendix 10)
Transmitting a request message from the message transmitting device to the message receiving device;
Based on the transmission message information that records the first request message for which the corresponding response message has not been transmitted from the message reception device among the transmitted first request messages, whether or not the second request message can be transmitted is determined. A determining step;
A program that causes a computer to execute a message transmission method.

DESCRIPTION OF SYMBOLS 10 Message transmitter 20 Message receiver 30 Communication path 11, 21 Bus 12, 22 CPU
13, 23 ROM
14, 24 RAM
15, 25 Storage device 16, 26 Communication interface 17, 27 Keyboard 18, 28 Display 110 Business processing unit 120 Request message transmission unit 130 Duplex transmission determination unit 140 Retransmission processing unit 150 Response processing unit 160 Transmission message table 210 Business processing unit 220 Response transmitter 230 Response message table

Claims (10)

A message transmission / reception system comprising a message transmission device and a message reception device,
The message transmission device
A transmission unit for transmitting a request message to the message reception device;
Based on the transmission message information that records the first request message for which the corresponding response message has not been transmitted from the message reception device among the transmitted first request messages, whether or not the second request message can be transmitted is determined. A determination unit for determining;
A message transmission / reception system comprising: A transmission unit for transmitting a request message to the message reception device;
Based on the transmission message information that records the first request message for which the corresponding response message has not been transmitted from the message reception device among the transmitted first request messages, whether or not the second request message can be transmitted is determined. A determination unit for determining;
A message transmission device comprising:   The said determination part restrict | limits transmission of the said 2nd request | requirement message | telegram which has the message | telegram main body same as the message | telegram main body of the said 1st request | requirement message | telegram contained in the said transmission message | telegram information. A message transmission device.   The said determination part deletes the said 1st request message corresponding to the said response message from the said transmission message information, when the said response message is received from the said message receiving apparatus. Message transmission device.   5. The message transmission device according to claim 2, wherein the transmission message information further includes an identifier that is unique to the request message. 6. The identifier includes information capable of determining before and after the creation time of each of the first and second request messages.
The determination unit extracts the second request message created at a time before the second request message from the transmission message information based on the identifier, and determines whether or not the second request message can be transmitted. The message transmission device according to claim 5, wherein the determination is performed. A message receiver that transmits a response message corresponding to a request message transmitted from a message transmitter to the message transmitter,
A message receiving device comprising: a response transmission unit that determines whether or not the response message can be transmitted based on response message information that records the response message that has not been transmitted to the message transmission device. A message transmission / reception method in a message transmission apparatus and a message reception apparatus,
Transmitting a request message to the message receiver by the message transmitter;
Based on the transmission message information that records the first request message in which the corresponding response message is not transmitted from the message reception device among the first request messages transmitted by the message transmission device, the second request message Determining whether or not transmission is possible by the message transmission device;
A message transmission / reception method comprising: Transmitting a request message from the message transmitting device to the message receiving device;
Based on the transmission message information that records the first request message for which the corresponding response message has not been transmitted from the message reception device among the transmitted first request messages, whether or not the second request message can be transmitted is determined. A determining step;
A message transmission method comprising: Transmitting a request message from the message transmitting device to the message receiving device;
Based on the transmission message information that records the first request message for which the corresponding response message has not been transmitted from the message reception device among the transmitted first request messages, whether or not the second request message can be transmitted is determined. A determining step;
A program that causes a computer to execute a message transmission method.

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