Hello, I apologize if I’m not following guidelines for posts. If there’s a format then please let me know.
I’ve been spinning my wheels on an issue I’m seeing when using LoRaMAC node stack v4.4.7. I have custom HW w/ sx1262 radio included. I have a multi tech gateway that is configured as packet forwarder. I’m monitoring the traffic on the gateway. I’m seeing that if I transmit at a fixed interval that pkts aren’t received at expected rate and it’s inconsistent. For example say I transmit 10 pkts over a period of time. In one set of tests I may see only 2 pkts and in another test I may see 4 (just an example). The remaining pkts aren’t received by gateway. I have not been able to get much information from log files to try and pinpoint issue is it CRC, MIC,???
I have been using this same custom HW for > 3 years now. I originally was using basicmac version of LMiC stack. This worked well but I recently moved to LoRaMAC node since basicmac was not recommended for new designs anymore. When I flash the basicmac stack code to this same HW the pkts are received by gateway at expected rate. She cause of this I’m confident there is not a HW issue. Again I’ve used this HW for years now. The part that’s frustrating in new stack (LoRaMAC node is that I’m getting “TXDONE” interrupt at expected rate. I can also see on spectrum analyzer that transmissions are occurring. I also have a portable SX1262 evaluation board that increments at expected rate when pkts are transmitting.
The issue is not due to transmitting on channels outside gateway receive antenna configuration. For test I’m transmitting on FSB1 channels [0,7] enabled. The gateway is configured for this band also.
One more note… I have a network separate from TTN that I use. I’ve always joined using ABP approach. This has not been an issue in the past. The LoRaWAN spec used is 1.0.3.
Also, regarding proximity to gateway I’m approximately 3 m from it at all times. I’ve actually taken off the receive antenna from gateway and can still see pkts received. My devices are transmitting at +18 dBm.
Any help or suggestions are greatly appreciated. I have a headache from trying to figure this one out for the past week.
Thanks in advance.