I tested the TX failsafe by setting it to RTL and then once I started a mission I shut off the TX. Everything went as expected and it immediately aborted the mission and RTL. I then started a mission and unplugged the 3DR radio from DroidPlanner expecting it to RTL since the telemetry signal was lost, but it continued the mission... I verified I had the failsafe set up in Mission Planner for telemetry to RTL on signal loss. Is this because it did not detect a lost of telemetry because the IRIS+ has the telemetry built in? or did the Failsafe not work correctly? or is there some other reason?