@mojojones wrote:
I posted this over in dronekit on Stackoverflow but didn't get an answer so I thought I'd try here...
I'm trying to use a companion computer to control an external device on a copter. I was hoping I could use an empty param of a MAV_CMD as a continent way to pass a value from the Mission that I could then use to set the device for a particular waypoint. In this case I was trying to use param2 of MAV_CMD_NAV_LOITER_TIME. I'm setting the value in QGroundControl, loading the mission to dronekit-sitl, then reading it with Python using the listener @vehicle.on_message('*') (so I can see everything). It comes back with a value of 0.0 (empty).
message: MISSION_ITEM {target_system : 255, target_component : 0, seq : 4, frame : 3, command : 19, current : 0, autocontinue : 1, param1 : 30.0, param2 : 0.0, param3 : 1.0, param4 : 0.0, x : 38.7160644531, y : -77.0515441895, z : 25.0}
Is this just not possible?
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