I am using STEVAL-STRKT01 with FP-ATR-LORA1. I have successfully joined the LoRa network (US915), but whenever the device tries to send data on the network it returns "Send Error" over the serial. By debugging the code, I have tracked the cause to be that it seems to be unable to find a valid channel to use. I have tried a couple different data rates (4 and 5) but it has not resolved the issue. What would cause this?
