The Sensors and IOT Gateways have new firmware, Version 7.6.
The biggest change is the IOT Gateways have a new feature to report the RSSI (Receive Signal Strength Indicator). This will let you know if a sensor is two far and barely working.
It comes enabled for IOT Gateways but can be turned off and on with two new commands:
RSSION to enable reporting.
RSSIOFF to disable reporting.
Because this is an IOT Gateway feature it reports the RSSI for all sensors regardless of version.