Connection error "only 1 heartbeat received"

Ground Control Software Mission Planner
1

Hello, I’ve spent almost two days trying to connect Storm32 gimbal to Pixhawk(according to this) no luck yet, now I got to the point where when I trying to connect through Mission Planer via bluetooth I get “only 1 heartbeat received” error, when I unplug gimbal from Telem2 port everything works fine, please help me find what could be the problem.

I’m using:
Mission Planer 1.3.50
APM:Copter v3.5.3 Quad

Thanks.