Hi there! I am sending manual control commands from pymavlink to the ROV. I realized sending commands like arm/disarm etc. with manual control button functions, the vehicle don’t send command acknowledge messages. I am wondering whether there is a kind of message which is sent when you arm, disarm or change gain. I want to use these feedback messages to change some labels in my GUI application. Any help would be appreciated. Thanks!
Hi @Efe,
There’s a direct arming/disarming command, although you can also use the arducopter_arm() and motors_armed_wait() pymavlink functions (as indicated in our example) 
If you’re already handling the command protocol in a general way then that may be faster (since a direct response will likely come sooner than the next HEARTBEAT), but it’s not something I’ve tried with arming/disarming.