I make some test with SX1262, my code is here: https://github.com/ngraziano/LMICPP-Arduino/tree/master/examples/simple_sx1262 , it is derived from LMIC with a lot modification just to test.
I only test it with EU868 and one SX1262 board with TCXO (like this one : https://www.nicerf.com/product_193_292.html). It only compile with platformio.