The manual says that in the fsk modulation mode, you can select one byte or two bytes for the unique word, but I actually tested it and found that the communication when set to one byte would fail.
The fault is manifested as the ST7580 has been sending the PHY_DataIndication command to the STM32 when it is confirmed that there is no data transmission on the power line. The length is random and the data is not fixed. At this time, when there is data on the power line, ST7580 cannot receive information.
In addition, when the unique word is configured as two bytes, the data on the power line can be received normally, but occasionally ST7580 will still send the PHY_DataIndication command to the STM32, and there is no data on the power line at this time.
