@bertrik I have used your Esp32PmSensor code on a ttgo-esp32-v2.1.6 board. As you can see on the photo the program sends messages to my gateway. In the log I can see that the gateway receives the join messages, but never send a downlink message. To me it looks that the JoinEUI and the DevEUI are reversed. That’s because another node I made joins perfect (see last screenshot).
Am I correct?