Connect receiver to a free UART (e.g., SERIAL2)
Set the following parameters:
ELRS telemetry will show up automatically in Mission Planner.
Failsafe and RSSI are handled internally by ELRS.
Use Yaapu telemetry on compatible radios for full telemetry display.
SERIAL2_PROTOCOL = 23 # RCIN for ELRS SERIAL2_BAUD = 420000 # Or 115200 (as needed)
