Bruno Mattedi

@per1234 Probably due to the hardware (SAMD), the code tries to reply too early and it isn't able to do so. I checked with the oscilloscope and although the debugging...

It's probably due to XBee3 having no secondary UART interface, only primary UART, so you have limitations.  You probably need to go here:  [Digi MicroPython](https://www.digi.com/resources/documentation/digidocs/PDFs/90002219.pdf)

You can use the side pins, this way you will be able to use normal jumpers to connect XBee's primary UART to ESP32 UART.  The connection need is: ```...