Socket BC66 receives what it sends


We are currently experiencing an issue working with the BC66 (firmware: BC66R01A11) and socket commands.

We deploy Opencpu and use MQTT-SN as a message protocol. Therefore we open a UDP socket and send data using the AT+QISENDEX command.

The issue is, that after sending data using this command it happens that the module receives data on the same port shortly after. This data is exactly, byte for byte the data that just has been sent out. This is nothing we programmed in. This data should not be received by the modem.

We checked our backend to see if it sends any data back, which it doesn’t, and we checked MQTT-SN if it is subscribed to the same topic, which it isn’t.

Thank you in advance!

Please print and upload your serial port log