Hello - just an update: I found an RN2903A device opposed to the RN2903. I still using the LoRa Development Utility from Microchip to send commands semi manually to the RN2903A device. I am now using OTAA - The device joins relatively painlessly which was a great surprised to me !
I’ve enabled channels 8,9,10,11,12,13,14,15 and 65 on the RN2903A to match the US915 frequency plan and matching the global_config.json file in my Multitech gateway.
I still have trouble sending messages reliably (takes about 10 to 20 attempts before a message gets thru).
Noted something interesting: Whilst I monitor “GATEWAY TRAFFIC” - I see the ONLY messages that the gateway seems to be receiving are on 904.6 Mhz SF8 BW 500. I haven’t seen any BW 125 messages come thru unless they are OTAA handshake messages.
Now that I’ve found an RN2903A module, I’ve upgraded the firmware to 1.0.3.
Sending a simple unconfirmed message by entering ‘max tx uncnf 1 30313233’ - I get “ok, mac_tx_ok, We Transmitted” replies from the RN2903A. 1 in about 20 attempts makes it thru - always on 904.5 SF8 BW500 only.
thank you again - any thoughts are appreciated.