Nucleo STM32WL55 Running LoRaWAN AT Slave - Why no Lora transmission?

[kiwironnie]

Have built the (single core) LoRaWAN AT Slave example from STM32Cube_FW_WL_V1.0.0, which has been flashed to a new Nucleo STM32WL55 board (straight out of the package). No apparent problems building and flashing. Configured for AS923 region.

Running an OTAA Join command the terminal returns:

AT+JOIN=1

35s069:TX on freq 923400000 Hz at DR 2

OK

35s461:MAC txDone

40s447:RX_1 on freq 923400000 Hz at DR 2

40s523:MAC rxTimeOut

41s447:RX_2 on freq 923200000 Hz at DR 2

41s523:MAC rxTimeOut

+EVT:JOIN FAILED

Looks ok but problem is that the radio isn't transmitting at all, as checked with a spectrum analyser (which sees output from other LoRaWAN boards running that frequency band).

Could be a simple configuration problem, but everything looks ok.

Suggestions would be welcome?

[kiwironnie · Accepted solution]

Oh Oh!

Answer to this question is that I have the low frequency version of the Nucleo board!! It does transmit but output is of course very weak at around 923MHz.

Darn. Have just ordered the correct board.