- sitl_gazebo in PX4/Firmware (6c34407d): https://github.com/PX4/sitl_gazebo/commit/9d512af0075659f0ace91ec0e2f8c8a170f911fb
    - sitl_gazebo current upstream: https://github.com/PX4/sitl_gazebo/commit/1264b74493cd2f362d852530bcc7423a013f2151
    - Changes: https://github.com/PX4/sitl_gazebo/compare/9d512af0075659f0ace91ec0e2f8c8a170f911fb...1264b74493cd2f362d852530bcc7423a013f2151

1264b74 2018-09-30 TSC21 - gazebo_motor_failure_plugin: clean up and fix for Gazebo 9
77141e7 2018-09-29 TSC21 - Travis: add naming for jobs within the build matrix
e46f82a 2018-09-29 TSC21 - add new 18.04 Melodic build
5b93919 2018-09-29 TSC21 - Travis: update ROS docker container

    - v2.0 in PX4/Firmware (f7a1da2261c579ef680c7d3b7a016bc4c6d13601): https://github.com/mavlink/c_library_v2/commit/e5f6257dd005b6fb3bff23d45f2b3b417b52539b
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/c5b465f5b455c5e6116cc5b6bf1332747a7b7494
    - Changes: https://github.com/mavlink/c_library_v2/compare/e5f6257dd005b6fb3bff23d45f2b3b417b52539b...c5b465f5b455c5e6116cc5b6bf1332747a7b7494

    c5b465f 2018-10-01 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/bae3015ecc05299968362a4623d506ea2840ec86

board_get_px4_guid() called board_get_uuid() with a 2 bytes offset into an
uint8_t array. This gives no guarantees on alignment, and board_get_uuid()
casts it to an uint32_t array, leading to potentially unaligned accesses.

Just to make sure we never have an UUID == 0

   This file was clearly clearly but built.

   This common code can be used byt posix based boars to provide
   the board_identity API.