Very low rate of success for Downlink

Hi,

I am using ESP32, RMF95, and sentrius rgxx gateway. I have experienced a very low success rate. Most of the time, Arduino thinks it is successful, but I only see activation on The things network. Only a few times the data actually get to The Things Network.

And this is what it looks like when I get success.

Thank you very much for help.

[matthijskooijman]

You talk about "downlink" (TTN -> Arduino), but your examples are about Arduino -> TTN. Did you mean uplink?

The Arduino does not really "think it is succesful", in the sense that it only knows that it sent something, it has no idea whether it was also received (unless you enable confirmed uplinks). It's hard to tell whether anything was actually (correctly) sent or not, or whether the problem is on the reception side. So far, LMIC has worked well for me, but I've only used EU868.

Things to try:

• See if you can see the raw traffic coming into the gateway. Maybe the problem is between the gateway and TTN console somewhere.
• Check the frequency plan of your gateway if it matches the TTN frequency plan.
• Maybe try this LMIC version: https://github.com/mcci-catena/arduino-lmic, which has seen some more recent development and might be more suited to 915Mhz.