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2. The message number
3. Message length (excluding header)
4. The task ID
5. The content of the task
After publishing the data, we can see the downlink instruction and uplink answer from the RAK Serial Tool:
Message format when execution is successful:
DTU_CMD
0x83
The MQTT subscription bar can see the upstream message "83000100010101" for successful execution.
Figure 24: Publishing data to RX topic
Figure 25: Received data and sent an answer
MSER
2Byte
MDATA_LEN
2Byte
MDATA
TASK_ID
1Byte
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