@miker none overrides the other. MY_TRANSPORT_MAX_TX_FAILURES sets the number of failed send() calls before the node starts searching for a new parent RFM95_RETRIES sets how many times RFM69 will try to send the message before send() returns false.

There is already a LoRa library available for both Arduino Board and STM32 Bluepill Board. Using the simple library, the LoRa Module SX1278 is easily transmitting and receiving data packets.