RegisterExtComponentReply (UORB message)
c
uint32 MESSAGE_VERSION = 1
uint64 timestamp # time since system start (microseconds)
uint64 request_id # ID from the request
char[25] name # name from the request
uint16 px4_ros2_api_version
bool success
int8 arming_check_id # arming check registration ID (-1 if invalid)
int8 mode_id # assigned mode ID (-1 if invalid)
int8 mode_executor_id # assigned mode executor ID (-1 if invalid)
bool not_user_selectable # mode cannot be selected by the user
uint8 ORB_QUEUE_LENGTH = 2