If the robot has the ability to fly or move, then perhaps just hop (up or over) out of arm's reach when someone comes too close? Real-time audio and video migh

If the robot has the ability to fly or move, then perhaps just hop (up or over) out of arm's reach when someone comes too close? Real-time audio and video might be very bandwidth (and therefore battery) intensive to transmit over a cellular connection. Instead, it might be more efficient to include a heartbeat signal that transmits the last GPS coordinates, and maybe a static image transmitted every second. When you stop receiving the heartbeat, that indicates that the robot's battery died or it is in trouble.