This avoids the need to modify the source code to hard-code the IP when
broadcast doesn't work.

Initializing the sockaddr_in structs with memset is unnecessary because
they are value-initialized by the Mavlink constructor.

If the ekf has not completed alignment or encounters a serious error that produces NaN's on the attitude states, then the control, attitude and position topics are not published
The control topic is published first to reduce latency

This brings various bugfixes for the framework, as well as Support for
RPi2 with Navio+.

added posix and qurt apps to enable remote execution of shell commands on qurt side from posix shell
commands are sent via muOrb to qurt, where they are executed and printed (i.e. visibile on mini-dm)

On Snapdragon we can't yet use the "used" mask for parameters and
therefore need to send all of them down to the ground station. All
params were set to used in an earlier commit but the count and index
function didn't reflect this change. This is fixed now, therefore we can
successfully receive all params in QGC.

Update nuttx_px4fmu-v2_default.cmake

hello sky

Enabled gps delay compensation for lpe based on x hist.

Instead of using the global position topic for NED velocities, let's use
the local position topic. Also, use the xy and z valid flags instead of
the system state.
In case of no local position update, still rely on the throttle stick
position.

In the case of the control state topic not updating, the land detector
would get stuck. Therefore, set it to landed in that case.

Updates parameter documentation to take advantage of the range finder height option.

Adds functionality allowing the range finder to be used as the primary height measurement when operating over flat terrain. This will be useful for indoor testing where barometric pressure is unreliable due to operation of HVAC systems.

-filter out new build_* directories
-add proper targets
-use uORB from posix_sitl_default