Code working, Ra-02 module does not

Hi,
very interessting project.
After hours i got the code working with the DFRobot Firebeetle.
But it repeats saying :"Lora radio init failed".
I tried two modules to be sure it is not broken.
Is there a way to simply test the Ra02 or messure the pins?
Thx and kind regards from Germany.
Patric


