CollisionConstraints (UORB message) 
Local setpoint constraints in NED frame setting something to NaN means that no limit is provided
c
# Local setpoint constraints in NED frame
# setting something to NaN means that no limit is provided
uint64 timestamp    # time since system start (microseconds)
float32[2] original_setpoint   # velocities demanded
float32[2] adapted_setpoint    # velocities allowed