Just guessing, but you should probably set the same spreading factor on the receiver also?

@re Yes. The SX1272 of the LoPy of SX1276 of the Lopy4 can only listen to one frequency and one SF/BW setting at a time. The target platform for these chips is motes (= Lora nodes, AFAIK), not gateways. Gateways use typically a different chip set, like the combination of Semtech SX1257 and SX1301/SX1308. If you need a full service gateway, you must get one. There are raspi add-on boards Like the IC880a from ICMP and the RAK831 which offer full service. Or you buy a ready gateway. Look at the The Things site for product lists. ICMP offers also a ready built box with raspi, receivber & software for testing.

@jcaron The Rising HF RHF301, on the frequencies described here: https://account.thethingsnetwork.org/api/v2/frequency-plans/US_902_928 So, it looks like that's 903900000 904100000 904300000 904500000 904700000 904900000 905100000 905300000 all on 125 kHz bw.

Hello bruno, this is what I did, instead of using the exemple code, I can set and catch the timeout error hence loop while not joint. while lora.has_joined() is not True: try: lora.join(activation=LoRa.OTAA, auth=(dev_eui, app_eui, app_key), timeout=20000, dr=0) except Exception as e: print('Not joined yet...')

Yesterday i was testing ADR on LoPy with confirmed packets. I achieved that LoPy change to a SF8BW125 but no more, the communication range was the same. I forced the LoPy to transmit at SF12 in the socket configuration, and the range is the same too... I looked from lora.tx_power() and the value is 13, i think 13 dBm. About 100 meters in line vision, the gateway measured SNR = 8 dB and RSSI = -78 dB ... it is OK?

@aris This topic looks quite old, and I really do hope that you have found the solution by now, but if not: To hardcode SF12 when joining this works for us: when joining: self.lora.join(activation=LoRa.OTAA, auth=(self.dev_eui, self.app_eui, self.app_key), timeout=0, dr=0) After setting up the socket: self.s.setsockopt(socket.SOL_LORA, socket.SO_DR, 0)