See binary MAVLink Messages in MAVProxy

I am sending data from QGroundControl to MAVProxy SITL. When i for example disarm copter in QGC i see in MAVProxy according text
Got MAVLink msg: COMMAND_ACK {command : 400, result : 0}

I would like to ask, if there is any method to see binary MAVLink message?
I mean i would like to see binary thata that caused that result. It would be possible to inspect sysid, comid message structure etc.
Thanks a lot for any help