PX4/Firmware — pull request #1420 by LorenzMeier (2014-11-01 15:57:56+00:00)
Title: Encode RC type in RSSI field for GCS

@DonLakeFlyer This is for you, but untested. The idea is the following: The new custom encoding shows up as a RSSI value of > 127 when connected, 0 when unconnected. It does encode the RC type. I will add this to the MAVLink specs, as it seems compatible and generic.