code: def send_velocity_world_setpoint(self, vx, vy, vz, yawrate):
          
          pk = CRTPPacket()
          pk.port = CRTPPort.COMMANDER_GENERIC
          pk.data = struct.pack('<Bffff', TYPE_VELOCITY_WORLD,
                                vx, vy, vz, yawrate)
          self._cf.send_packet(pk)
docs: Send Velocity in the world frame of reference setpoint.
  
          vx, vy, vz are in m/s
          yawrate is in degrees/s