Get RSSI as PPM PWM SBUS IBUS

Telemetry values Error and SNR can be used as channel input to provide signal quality information back to FC/OSD without additional hardware. Configuration can be made in the aux-channel assignment menu. Selecting Err will use error rate. Channel value is calculated as: Error = 0 -> channel value 2000; Error = 100 -> channel value 1000;

In case of SNR a logarithmic scale is being used - highest SNR seen since start is being used a reference signal.