JP6951380B2 - Gateway device, communication method and program - Google Patents

Description

The present invention relates to gateway devices, communication methods and programs.

Conventionally, an IoT (Internet of Things) system has been used by transmitting sensor data to a sensor terminal having a communication function and a sensor function such as a thermometer or a hygrometer, and storing and using these sensor data in a server or a storage device. It is provided. In the IoT system, a plurality of sensor terminals having different types of sensor functions according to the purpose are installed in the measurement target space. Then, the sensor data generated by the measurement by the plurality of sensor terminals is received and accumulated in a predetermined server or the like via the network.

Since many such sensor terminals are installed in the measurement target space, low power consumption is required from the viewpoint of maintainability and the like. Therefore, it is desirable that the sensor terminal has a relay function, is housed in a gateway device installed inside or near the measurement target space, and transmits sensor data to the gateway device by a low power consumption short-range wireless communication method. .. In this case, the gateway device transmits the received sensor data to the server or the like by an arbitrary communication method such as a mobile communication method. Patent Document 1 describes a communication terminal that receives data from a sensor device by a short-range wireless communication method, converts the received data into a long-range wireless communication method such as a mobile communication method, and transmits the data.

Japanese Patent No. 6408057

By the way, in general, the format of the sensor data differs depending on the model of the sensor terminal. Therefore, in order to use the sensor data in a server or the like, it is necessary to convert the format of the sensor data into a format common to each sensor terminal. Since performing such conversion on a large amount of data stored in a server or the like entails a large processing load, it is desirable that the gateway device converts the format of the sensor data and transmits it to the server or the like.

However, in this case, in order to newly provide the IoT system, it is necessary to develop a gateway device having a conversion function corresponding to the sensor data format of each sensor terminal included in the IoT system each time. Further, when a different sensor terminal is introduced into an existing IoT system and newly accommodated in the gateway device, it is necessary to add a conversion function corresponding to the sensor terminal to the gateway device each time. Therefore, there has been a demand for a gateway device capable of easily accommodating different sensor terminals.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a gateway device, a communication method, and a program capable of easily accommodating different sensor terminals.

The gateway device according to the present invention associates identification information of a plurality of transmitting terminals with a plurality of definition information that defines a conversion method of first data transmitted from each transmitting terminal and having a different data structure depending on the transmitting terminal. Acquires the storage unit that stores the data, the receiving unit that receives the identification information of the transmitting terminal and the first data from any of the transmitting terminals, and the definition information associated with the received identification information. A conversion unit that converts the received first data into second data having a data structure common to each transmission terminal based on the acquired definition information, and a transmission unit that transmits the second data. , It is characterized in that.

Further, in the gateway device according to the present invention, the definition information associates the specific information for specifying the predetermined data included in the first data with the attribute information indicating the attribute of the predetermined data, and the conversion unit specifies the specific information. It is preferable to extract predetermined data from the first data based on the information and convert the first data into the second data by associating the extracted predetermined data with the attribute information.

Further, in the gateway device according to the present invention, the specific information is preferably information indicating the position and length of predetermined data in the data structure of the first data.

Further, it is preferable that the gateway device according to the present invention further includes a storage processing unit that receives identification information and definition information from a management terminal and stores the identification information and the received information in a storage unit in association with each other.

Further, in the gateway device according to the present invention, the storage unit stores the model of the transmitting terminal in association with the definition information, and the acquisition unit stores the model of the transmitting terminal that transmits the identification information based on the received identification information. It is preferable to specify and acquire the definition information associated with the specified model.

The communication method according to the present invention is a communication method in a gateway device including a storage unit, and is a first data having identification information of a plurality of transmitting terminals and a data structure transmitted from each transmitting terminal and different depending on the transmitting terminal. A plurality of definition information that determines the conversion method of The definition information associated with the identification information is acquired, and based on the acquired definition information, the received first data is converted into the second data having a data structure common to each transmitting terminal, and the second data is transmitted. It is characterized by including.

The program according to the present invention is a program of a gateway device including a storage unit, and converts identification information of a plurality of transmitting terminals and first data transmitted from each transmitting terminal and having a different data structure depending on the transmitting terminal. A plurality of definition information for determining a method is associated and stored in a storage unit, and the identification information and the first data of the transmission terminal are received from any of the transmission terminals of the plurality of transmission terminals, and the received identification information is received. The definition information associated with is acquired, and based on the acquired definition information, the received first data is converted into the second data having a data structure common to each transmitting terminal, and the second data is transmitted. It is characterized in that the gateway device is made to execute the above.

The gateway device, communication method and program according to the present invention make it possible to easily accommodate different sensor terminals.

It is a schematic diagram for demonstrating the outline of the IoT system. It is a figure which shows an example of the schematic structure of the IoT system 1. It is a figure which shows an example of the schematic structure of the gateway device 3. It is a figure for demonstrating the data transmitted from the sensor terminal 2. It is a figure which shows an example of the data structure of the identification information table T1. It is a figure which shows an example of the data structure of the definition information table T2. It is a flow chart which shows an example of the flow of communication processing. It is a flow figure which shows an example of the flow of a storage process.

Hereinafter, various embodiments of the present invention will be described with reference to the drawings. However, it should be noted that the technical scope of the present invention is not limited to those embodiments, but extends to the inventions described in the claims and their equivalents.

(Overview of IoT system)
FIG. 1 is a schematic diagram for explaining an outline of the IoT system according to the present invention.

The IoT system has a plurality of sensor terminals installed in the measurement target space, a gateway device, and a server. The IoT system, for example, is for providing an IoT service in which measurement information indicating the temperature, humidity, etc. of the measurement target space is stored in a server by a plurality of sensor terminals and used by a user such as an administrator of the measurement target space. Used for.

The sensor terminal has a sensor function that generates measurement information such as temperature, humidity, pressure, illuminance, noise or vibration magnitude, or position information, and sensor data including the measurement information is periodically or irregularly generated by a short-range wireless communication method. A terminal having a transmission function for transmitting to a gateway device. The short-range wireless communication method used by the sensor terminal is a low-power short-range wireless communication method such as BLE (Bluetooth (registered trademark) Low Energy) or EnOcean (registered trademark). The plurality of sensor terminals may generate different types of measurement information from each other, or may generate the same type of measurement information. The sensor terminal is an example of a transmitting terminal, and the sensor data and the measurement information are examples of the first data and predetermined data, respectively.

The gateway device is a communication device having a function of receiving sensor data from a sensor terminal and transmitting the converted data obtained by converting the sensor data to a server. The gateway device is installed inside or near the measurement target space so that communication with the sensor terminal can be performed by a short-range wireless communication method. The converted data is an example of the second data.

The server is an information processing device managed by the provider of the IoT system, which receives and stores the converted data from the gateway device. The user of the IoT system can use the measurement information accumulated by accessing the server via the network.

Hereinafter, an outline of communication processing by the IoT system will be described with reference to FIG.

First, the gateway device receives the identification information and sensor data of the sensor terminal from any of the plurality of sensor terminals ((1) in FIG. 1). The identification information is information for identifying each of the plurality of sensor terminals. The sensor data includes measurement information generated by the sensor terminal and has a different data structure depending on the sensor terminal. In the example shown in FIG. 1, the gateway device acquires the identification information of the sensor terminal A and the sensor data from the sensor terminal A.

Subsequently, the gateway device associates the identification information of the plurality of sensor terminals with the identification information received from the storage unit that stores the identification information of the plurality of sensor terminals and the plurality of definition information that determines the conversion method of the sensor data transmitted from each sensor terminal. Acquire the defined definition information ((2) in FIG. 1). In the example shown in FIG. 1, the gateway device acquires "definition information A" which is definition information associated with "sensor terminal A" which is received identification information.

Subsequently, the gateway device converts the received sensor data based on the acquired definition information into the converted data ((3) in FIG. 1). The converted data is data having a data structure common to each sensor terminal, regardless of the sensor terminal that transmitted the sensor data. In the example shown in FIG. 1, the gateway device converts the sensor data based on the acquired "definition information A".

Subsequently, the gateway device transmits the converted data to the server ((4) in FIG. 1), and ends the communication process.

As described above, the gateway device according to the present invention stores the identification information of the sensor terminal and the definition information in association with each other, and stores the sensor data based on the definition information according to the identification information received from the sensor terminal. Convert to converted data that has a common data structure in. In this way, the gateway device makes it possible to easily accommodate different sensor terminals. That is, when the IoT system provider newly provides the IoT system, it suffices to set the definition information corresponding to the sensor terminal of the IoT system in the gateway device according to the present invention, and newly develops the gateway device. You don't have to.

The above description of FIG. 1 is merely an explanation for deepening the understanding of the contents of the present invention. Specifically, the present invention may be carried out in each of the embodiments described below, and may be carried out by various modifications without substantially exceeding the principles of the present invention. All such variations are included within the scope of the present invention and the present specification.

(Configuration of IoT system)
FIG. 2 is a diagram showing an example of a schematic configuration of an IoT system 1 according to an embodiment of the present invention. The IoT system 1 has a plurality of sensor terminals 2A, 2B and 2C (hereinafter, referred to as a sensor terminal 2 when it is not necessary to distinguish them), a gateway device 3, a server 4, and a management terminal 5. The sensor terminals 2A, 2B and 2C and the gateway device 3 are communicably connected by a short-range wireless communication method. The gateway device 3, the server 4, and the management terminal 5 are connected to each other so as to be able to communicate with each other via a network 6 such as the Internet or an intranet.

The management terminal 5 is a terminal having a communication function managed by an IoT service provider, and is, for example, a PC (Personal Computer) or a multifunctional mobile phone (so-called "smartphone"). The management terminal 5 transmits the identification information and the definition information in order to store the identification information and the definition information in the gateway device 3 in response to the operation of the IoT service provider.

(Gateway device configuration)
FIG. 3 is a diagram showing an example of a schematic configuration of the gateway device 3. The gateway device 3 includes a storage unit 31, a first communication unit 32, a second communication unit 33, and a processing unit 34.

The storage unit 31 is a device for storing a program or data, and includes, for example, a semiconductor memory device. The storage unit 31 stores an operating system program, a driver program, an application program, data, and the like used for processing by the processing unit 34. The program is installed in the storage unit 31 from a computer-readable portable storage medium such as a CD-ROM or a DVD-ROM using a known setup program or the like.

The first communication unit 32 includes a communication interface circuit that enables the gateway device 3 to communicate with the sensor terminal 2. The communication interface circuit included in the first communication unit 32 is a communication interface circuit of a short-range wireless communication system having low power consumption, such as BLE or EnOcean. The first communication unit 32 receives the data transmitted from the sensor terminal 2 and supplies the data to the processing unit 34.

The second communication unit 33 includes a communication interface circuit that enables the gateway device 3 to communicate with the server 4 and the management terminal 5. The communication interface circuit included in the second communication unit 33 is a mobile communication system such as LTE (Long Term Evolution) or a communication interface circuit such as a wireless LAN (Local Area Network) or a wired LAN. The second communication unit 33 transmits the data supplied from the processing unit 34 to the server 4, receives the data transmitted from the management terminal 5, and supplies the data to the processing unit 34.

The processing unit 34 includes one or more processors and peripheral circuits thereof. The processing unit 34 is, for example, a CPU (Central Processing Unit), and controls the operation of the gateway device 3 in an integrated manner. The processing unit 34 may be a DSP (Digital Signal Processor), an LSI (Large-Scaled IC), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or the like. The processing unit 34 controls the operations of the first communication unit 32 and the second communication unit 33 so that various processes of the gateway device 3 are executed in an appropriate procedure based on the program stored in the storage unit 31. .. The processing unit 34 executes processing based on the program stored in the storage unit 31. In addition, the processing unit 34 can execute a plurality of programs in parallel.

The processing unit 34 includes a receiving unit 341, an acquisition unit 342, a conversion unit 343, a transmitting unit 344, and a storage processing unit 345 as its functional blocks. Each of these parts is a functional module realized by a program executed by the processing unit 34. Further, each of these parts may be mounted on the gateway device 3 as firmware.

(Structure of various data)
Hereinafter, an example of the structure of various data transmitted / received or stored in the IoT system 1 will be described with reference to FIGS. 4 to 6.

FIG. 4 is a diagram for explaining sensor data transmitted from the sensor terminal 2. The example shown in FIG. 4 is an example in which the sensor terminal 2 uses BLE as a short-range wireless communication method and transmits the advertisement packet 400 of the BLE including the identification information and the sensor data.

The advertisement packet 400 transmitted from the sensor terminal 2 includes a preamble, an access address, a PDU (Protocol Data Unit), and a CRC (Cyclic Redundancy Check). The preamble and access address are predetermined code strings for the receiver to identify the advertisement packet 400. CRC is an error detection code.

The PDU includes a header, an advertiser's address 401, and an advertiser's data. The header includes information and the like indicating that the advertisement packet is 400. The advertiser address 401 is identification information for identifying the sensor terminal 2 that has transmitted the advertisement packet 400.

Advertiser data includes multiple structures (AD Structure) and padding (00 ... 00). Each structure includes Length, AD Type 402 and Data Data 403. The length is information indicating the length of the data 403 (for example, the number of octets). Type 402 is information indicating the type of data 403, and different values are set according to the sensor terminal 2. The data 403 is sensor data that includes measurement information and has a different data structure depending on the sensor terminal 2. For example, the length of the data 403 and the position and length of the measurement information in the data structure of the data 403 differ depending on the sensor terminal 2.

The transmission of the sensor data and the identification information is not limited to the advertisement packet of BLE. When the sensor terminal 2 uses a communication method other than BLE (for example, EnOcean) as the short-range wireless communication method, the sensor data and the identification information may be included in the packet specified in the communication method. Further, even when the sensor terminal 2 uses BLE as the short-range wireless communication method, the sensor data and the identification information may be included in the packet other than the advertisement packet.

FIG. 5 is a diagram showing an example of the data structure of the identification information table T1 stored in the storage unit 31. The identification information table T1 stores the identification information, the model, and the definition information in association with each other. The identification information is information for identifying the sensor terminal 2 that has transmitted the sensor data in the IoT system 1, and is, for example, the advertiser address 401 of the advertisement packet. The model is information indicating the model of the sensor terminal 2, and is, for example, the model number of the sensor terminal 2, the identification information of the model number, or the like. Even if the sensor terminals 2 are manufactured by the same manufacturer and have the same type (for example, thermometer, illuminance sensor, etc.), if their model numbers and the like are different from each other, different models are associated with each other. The same model may be associated with a plurality of sensor terminals 2. The definition information is information that defines a conversion method of sensor data, and is, for example, a parameter for causing the gateway device 3 to execute a conversion process according to the sensor terminal 2 that has transmitted the sensor data. The definition information may be an instruction sequence for causing the gateway device 3 to execute the conversion process, or may be the name or path of a file in which parameters or instruction sequences are described. In the example shown in FIG. 5, different models are associated with different definition information, but different models may be associated with the same definition information. By doing so, when the sensor data transmitted by the sensor terminals 2 of different models has a common data structure, it is possible to associate the same definition information with those sensor terminals 2, and the definition information for each model. Eliminates the work of creating. Further, when the sensor data transmitted from the plurality of sensor terminals 2 has a common data structure, the same model may be associated with each other even if the sensor terminals 2 have different model numbers.

FIG. 6 is a diagram showing an example of the data structure of the definition information table T2 stored in the storage unit 31. The definition information table T2 stores parameters for causing the gateway device 3 to execute the conversion process, and is set for each definition information. The example shown in FIG. 6 is an example in which the sensor data and the identification information are included in the advertisement packet of BLE and transmitted, and the definition information table T2 associates the type, the offset, the length, and the attribute information. And remember. The type is a value of type 402 shown in FIG. 4, for example, a value expressed in 2 octets. The type is information that identifies sensor data that includes measurement information in the advertisement packet 403. The offset and size are information for specifying the position and length of the measurement information in the data structure of the sensor data. The attribute information is information indicating the attribute of the measurement information, and is, for example, "temperature" or "humidity". The type, offset, and size are examples of specific information.

In the example shown in FIG. 6, "temperature" is associated with the type of "0xFF", the offset of "7", and the size of "2" as attribute information. That is, it is shown that the 2 octets of the data 403 included in the structure in which the value of the type 402 is "0xFF" starting from the 7th octet is the measurement information of the "temperature". Similarly, it is shown that the 2 octets starting from the 9th octet are the measurement information of "humidity".

When the sensor data and the identification information are included in a packet different from the advertisement packet of BLE and transmitted, the definition information table T2 shows the position of the measurement information in the packet instead of the type, offset and size. Remember.

When the data type of the measurement information included in the sensor data (for example, "integer", "floating point number", etc.) differs depending on the sensor terminal 2, the definition information table T2 further associates the data type of the measurement information. You may memorize it.

(Flow of various processes)
Hereinafter, an example of the flow of communication processing and storage processing executed by the gateway device 3 will be described with reference to FIGS. 7 and 8. These processes are realized by the processing unit 34 collaborating with each component of the gateway device 3 based on the program stored in the storage unit 31 in advance.

FIG. 7 is a flow chart showing an example of the flow of communication processing executed by the gateway device 3. The communication process is executed when the sensor data is transmitted from the sensor terminal 2 to the gateway device 3.

First, the receiving unit 341 receives the identification information and the sensor data of the transmitting terminal from any one of the plurality of transmitting terminals (S101). The receiving unit 341 receives, for example, an advertisement packet of BLE containing the identification information and the sensor data via the first communication unit 32.

Subsequently, the acquisition unit 342 acquires the definition information associated with the received identification information (S102). The acquisition unit 342 refers to the identification information table T1 and identifies the model associated with the received identification information as the model of the sensor terminal 2 that has transmitted the identification information. Subsequently, the acquisition unit 342 acquires the definition information table T2 for the definition information associated with the specified model from the storage unit 31.

Subsequently, the conversion unit 343 converts the received sensor data into the converted data based on the acquired definition information (S103). The conversion unit 343 refers to the acquired definition information table T2 and extracts measurement information from the received sensor data. Subsequently, the conversion unit 343 converts the sensor data into the converted data by associating the extracted measurement information with the corresponding attribute information.

For example, the conversion unit 343 acquires the type value from the definition information table T2 and specifies the sensor data corresponding to the acquired type value. In the example of the definition information table T2 shown in FIG. 6, the conversion unit 343 acquires "0xFF" as the type value, and identifies the data 403 corresponding to the type 402 of "0xFF" from the received advertisement packet 400. ..

Subsequently, the conversion unit 343 acquires the offset and size values from the definition information table T2, and extracts measurement information from the sensor data based on the acquired offset and size values. In the example of the definition information table T2 shown in FIG. 6, first, the conversion unit 343 acquires "7" as the offset value and "2" as the size value, and 7 of the sensor data based on the acquired values. Two octets are extracted as the first measurement information from the second octet. Further, the conversion unit 343 acquires "9" as the offset value and "2" as the size value, and extracts 2 octets from the 9th octet of the sensor data as the second measurement information based on the acquired values. do.

Subsequently, the conversion unit 343 generates the converted data by associating the extracted measurement information with the attribute information. In the example of the definition information table T2 shown in FIG. 6, the conversion unit 343 sets the extracted first measurement information as the corresponding attribute information “temperature” and the second measurement information as the corresponding attribute information “humidity”. ”Is associated with each other.

Subsequently, the transmission unit 344 transmits the converted data to the server 4 via the second communication unit 33 (S104), and ends the communication process. The transmitted converted data is stored and stored in the storage device in the server 4.

FIG. 8 is a flow chart showing an example of the flow of storage processing executed by the gateway device 3. The storage process is executed when the identification information and the definition information are transmitted from the management terminal 5 to the gateway device 3.

First, the storage processing unit 345 receives the identification information and the definition information from the management terminal 5 via the first communication unit 32 (S201).

Subsequently, the storage processing unit 345 stores the received identification information and the definition information in the storage unit 31 (S202), and ends the storage processing. The storage processing unit 345 determines whether or not the received identification information is stored in the identification information table T1. When it is determined that the information is not stored, the storage processing unit 345 associates the received identification information with the definition information and newly stores the received identification information in the identification information table T1. If it is determined that the information is stored, the definition information associated with the received identification information is updated to the received identification information.

As described above, the gateway device 3 stores the identification information of the sensor terminal 2 in association with the definition information, and transmits the sensor data to each sensor terminal based on the definition information corresponding to the identification information received from the sensor terminal 2. Convert to converted data with a common data structure. By doing so, the gateway device 3 makes it possible to easily accommodate different sensor terminals.

Further, the gateway device 3 extracts measurement information from the sensor data based on the specific information included in the definition information, and converts the sensor data into the converted data by associating the extracted measurement information with the attribute information. By doing so, even if the sensor data has a different data structure depending on the sensor terminal 2, the same attribute information is associated with the same type of measurement information, so that the data is centrally managed by the server 4. It becomes possible to do.

Further, in the gateway device 3, the specific information is information indicating the position and length of the measurement information in the data structure of the sensor data. As a result, the gateway device 3 can extract desired measurement information from the sensor data having a different data structure depending on the sensor terminal.

Further, the gateway device 3 receives the identification information and the definition information from the management terminal, and stores the identification information and the received information in the storage unit in association with each other. By doing so, even when the sensor terminal 2 is newly added to the IoT system 1, the provider of the IoT system 1 can provide the IoT service by updating the definition information of the gateway device 3.

Further, the gateway device 3 associates the model of the sensor terminal 2 with the definition information and stores it in the storage unit, and acquires the definition information associated with the model of the sensor terminal 2 that has transmitted the identification information. Generally, sensor terminals 2 of the same model transmit sensor data having the same data structure. Therefore, by doing so, the provider of the IoT system 1 only needs to set the definition information corresponding to the model of the sensor terminal 2 in the gateway device 3, so that a large number of sensor terminals can be easily accommodated.

It will be appreciated by those skilled in the art that various changes, substitutions and modifications can be made to this without departing from the spirit and scope of the invention. For example, the above-mentioned processing of each part may be executed in an appropriately different order within the scope of the present invention. Further, the above-described embodiments and modifications may be carried out in appropriate combinations within the scope of the present invention.

3 Gateway device 31 Storage unit 32 1st communication unit 33 2nd communication unit 341 Reception unit 342 Acquisition unit 343 Conversion unit 344 Transmission unit 345 Storage processing unit

Claims (5)

Identification information of a plurality of transmitting terminals, information of a type indicating a type of first data transmitted from each transmitting terminal and having a different data structure depending on the transmitting terminal, and predetermined data in the data structure of the first data. A storage unit that stores offset and size information indicating a position and a length, respectively, and attribute information indicating an attribute of the predetermined data in association with each other.
A receiving unit that receives the identification information and the first data of the transmitting terminal from any one of the plurality of transmitting terminals.
An acquisition unit that acquires type, offset, and size information and attribute information associated with the received identification information.
The first data corresponding to the acquired type is specified from the received first data, and the predetermined data is obtained from the specified first data based on the acquired offset and size values. A conversion unit that converts the first data into second data having a data structure common to each transmitting terminal by extracting and associating the acquired attribute information with the extracted predetermined data.
A transmitter that transmits the second data and
A gateway device comprising. The identification information , the type information, the offset and size information, and the attribute information are received from the management terminal, and the identification information , the type information, the offset and size information, and the attribute information are associated with each other. The gateway device according to claim 1, further comprising a storage processing unit for storing in the storage unit. The storage unit stores the model of the transmitting terminal, the type information, the offset and size information, and the attribute information in association with each other.
The acquisition unit identifies the model of the transmitting terminal that transmitted the identification information based on the received identification information, and obtains the type information, offset and size information, and attribute information associated with the specified model. get,
The gateway device according to claim 1 or 2. A communication method in a gateway device equipped with a storage unit.
Identification information of a plurality of transmitting terminals, information of a type indicating a type of first data transmitted from each transmitting terminal and having a different data structure depending on the transmitting terminal, and predetermined data in the data structure of the first data. The offset and size information indicating the position and the length, respectively, and the attribute information indicating the attribute of the predetermined data are associated and stored in the storage unit.
The identification information and the first data of the transmitting terminal are received from any of the transmitting terminals of the plurality of transmitting terminals, and the identification information of the transmitting terminal is received.
The type, offset and size information and attribute information associated with the received identification information are acquired.
The first data corresponding to the acquired type is specified from the received first data, and the predetermined data is obtained from the specified first data based on the acquired offset and size values. By extracting and associating the acquired attribute information with the extracted predetermined data, the first data is converted into second data having a data structure common to each transmitting terminal.
Sending the second data,
A communication method characterized by including. It is a program of a gateway device equipped with a storage unit.
Identification information of a plurality of transmitting terminals, information of a type indicating a type of first data transmitted from each transmitting terminal and having a different data structure depending on the transmitting terminal, and predetermined data in the data structure of the first data. The offset and size information indicating the position and the length, respectively, and the attribute information indicating the attribute of the predetermined data are associated and stored in the storage unit.
The identification information and the first data of the transmitting terminal are received from any of the transmitting terminals of the plurality of transmitting terminals, and the identification information of the transmitting terminal is received.
The type, offset and size information and attribute information associated with the received identification information are acquired.
The first data corresponding to the acquired type is specified from the received first data, and the predetermined data is obtained from the specified first data based on the acquired offset and size values. By extracting and associating the acquired attribute information with the extracted predetermined data, the first data is converted into second data having a data structure common to each transmitting terminal.
Sending the second data,
A program characterized by causing the gateway device to execute the above.

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