I am using rak3172 module with custom C program with ST library’s. For example I turn on two module with settings:
433 MHz, SF 12, BW 65
First module send 32 bytes per 30 second successfully, but second receives only two interrupts from CAD - “Cad detect” and “Preamble detect”. Other doesnt receive.
If I decrease SF to 10 or below - second device receive package from first successfully.
What wrong with SF11,12 with BW below 125 kHz?