RSSI is the relative strength of the received signal and is used for the following tasks:
- Determining connection quality
- Determining the value of the noise floor
- Checking for a quiet channel before transmitting
The RSSI state machine was designed specifically to determine connection quality. The state machine stops calculating the signal strength after the RSSI register is read. Therefore in order to periodically check RSSI receive mode must be toggled off and back on.