Broadcast telemetry to multiple locations

I would like to be able to broadcast the telemetry of the UAV to multiple locations, but only have one basestation able to control the UAV. The relevant setup is:

  • Pixhawk with Tradheli 3.3
  • RFD900 Radios with 2.6 firmware capable of multipoint communication
  • Windows 10 Laptop with Mission Planner

I have successfully connected other android devices running Tower to the Pixhawk. However, I couldn’t figure out how to keep them from controlling the copter. I only wan’t one set of controls for safety reasons. How do others do this?