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Control data transfer
Last updated: 2025-02-11 16:46:49
Note:
Control data transfer, used for binary data communication between the field device and the remote device. The SDK provides a data sending interface and a data receiving callback interface for both types of devices.
Note:
Field device SDK, the data sending interface will send data in a broadcast manner to all remote devices that are in a session connection with the field device.
Remote Device SDK, the data sending interface can send data to the specified field device within the session connection. Only when the remote device has master permission of the field device, the message can be successfully sent.
Field Device
Send data to remote devices
Note:
This interface will send data messages to all remote devices that are in session connection with the field device. The single message length limit is 700 bytes, and the sending frequency is limited to 100Hz.
extern "C" TRRO_EXPORT int TRRO_sendControlData(const char* msg, int len, int qos = 0);
Parameter | Meaning |
msg | Message content |
len | Message length |
qos | Send qos type. 0: ultra-low latency transmission, data lost is allowed 1: Reliable Transmission |
Returned values | Success: 1 Failed: <= 0 |
Register control message callback
extern "C" TRRO_EXPORT int TRRO_registerReportDataCallback(void* context, TRRO_onReportData * callback);
Parameter | Meaning |
context | Callback Context |
TRRO_onControlData | Callback Function |
typedef void TRRO_onReportData(void* context, const char* gwid, const char* msg, int len, int qos)
Parameter | Meaning |
context | Callback Context |
gwid | Field Device ID |
msg | pointer to the data buffer |
len | String Length |
qos | Message qos type: 0: ultra-low latency transmission, data lost is allowed 1: Reliable Transmission |
Remote Device
Send data to field device
This interface will send data messages to the specified field device in the session connection. Sending will succeed only if the remote device has the master permission of the field device. The single message length limit is 700 bytes, and the sending frequency is limited to 100Hz.
extern "C" TRRO_EXPORT int TRRO_sendControlData(const char* gwid, const char* msg, int len, int qos = 0);
Parameter | Meaning |
gwid | On-site Equipment ID |
msg | Send binary data |
len | Message length |
qos | Send qos: 0: ultra-low latency transmission, data lost is allowed 1: Reliable Transmission |
Returned values | Success: 1 Failed: <= 0 |
Register control message callback
This interface is used to register the report data callback function to receive the data sent by the field device.
extern "C" TRRO_EXPORT int TRRO_registerReportDataCallback(void* context, TRRO_onReportData * callback);
Parameter | Meaning |
context | Context Pointer |
callback | Callback Function |
typedef void TRRO_onReportData(void* context, const char* gwid, const char* msg, int len, int qos)
Parameter | Meaning |
context | Callback Context |
gwid | Field Device ID |
msg | pointer to the data buffer |
len | String Length |
qos | Message qos type. 0: ultra-low latency transmission, data lost is allowed 1: Reliable Transmission |
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