It was already answered here before.
SoftRF is using LoRa Phy layer / modulation to operate on so-called FANET radio protocol.
FANET is 1 out of 4 protocols supported. Other 3 are FSK modulation based.
FANET (LoRa based) is a standard feature of ‘factory’ SoftRF firmware.
However, one LoRaWAN ‘application’ - TTNMapper is included into SoftRF source code and can be activated by a custom build.
Semtech Basic MAC (successor of LMIC) derivative named ‘arduino-basicmac’ (adapted for Arduino by Matthijs Kooijman upon request from Lacuna Space) is known to work good enough on ESP32+SX1262 with TheThingsNetwork.