Copter Disarm Command Rejected

We have encountered an unexpected (at least to us) disarm behavior several times and would appreciate some help diagnosing the issue.  We attempted to send a disarm command from Mission Planner but the command was rejected ("Error: command rejected b

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ArduCopter Pixhawk HAL UART question

I'm trying to use one of the extra UART connections on the Pixhawk to interface to a Beaglebone Black.  I found in the Pixhawk HAL library (HAL_PX4_Class.cpp) where to assign device information, i.e. /dev/ttyS1 etc.  I haven't had any luck finding an

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