Lora Node unable to receive downlink messages

[sgodey]

I am using RFM95W module along with ATMega328p as an IoT node. I have a RAK2245 based gateway that is continuously sending packets at 923.3 and SF12. Below is the log output. I am dumping RSSI when ever OpMode changes. All times, I am seeing RXTIMEOut. I have been stuck at this problem for long time. Any help is greatly appreciated.

Starting
RXMODE_RSSI
Packet queued
1182: Opmode: 0x8b
1220: rssi: -164 dBm MdmStat: 0x10
26841: Opmode: 0x89
26882: rssi: -164 dBm MdmStat: 0x10
26989: Opmode: 0x88
27053: rssi: -164 dBm MdmStat: 0x0
83443: RXMODE_SINGLE, freq=923300000, SF=10, BW=500, CR=4/5, IH=0
83459: Opmode: 0x8e
83570: rssi: -44 dBm MdmStat: 0x4
96100: Opmode: 0x89
96142: rssi: -45 dBm MdmStat: 0x14
96245: Opmode: 0x88
96305: rssi: -164 dBm MdmStat: 0x0
140438: RXMODE_SINGLE, freq=923300000, SF=12, BW=500, CR=4/5, IH=0
140457: Opmode: 0x8e
140578: rssi: -41 dBm MdmStat: 0x4
159538: Opmode: 0x88
159582: rssi: -164 dBm MdmStat: 0x0
159662: EV_TXCOMPLETE (includes waiting for RX windows)
Packet queued

[matthijskooijman]

Did you see and try https://github.com/matthijskooijman/arduino-lmic#problems-with-downlink-and-ota ?

[sgodey]

I am using 10% clock correction.

LMIC_setClockError(MAX_CLOCK_ERROR * 10 / 100);

And my RX2 settings are 923.3 MHz, BW500 and SF12. I am using util_tx_continous from https://git.luolix.topLora-net/lora-gateway, to generate a continuous stream of Lora packets at Freq-923.3, BW-500, SF12.

[kangyang73]

Does it work? I also have same problems.

[sgodey]

Does it work? I also have same problems.

It worked for me. My problem was ...

1. Not properly aligning the channel frequencies/SF/BW between transmitter and receiver.
2. The packet format between tx and rx was little bit different (receiver was expecting explicit header and transmitter was sending implicit header)

Once I fixed those and use the LMIC_setClockError, it worked for me.

[mrx23dot]

Please close issue.