What is the RSSI LED for and why do they just blink all the time?
I guess nobody knows? I thought it was only supposed to respond when receiving packets?
RSSI stands for Receive Signal Strength Indicator. It will only be on for a short time and provide you with the RSSI level of the last packet received. See https://www.digi.com/resources/documentation/digidocs/90002173/#concepts/c_rssi_indicators.htm?Highlight=RSSI