code: def send_zdistance_setpoint(self, roll, pitch, yawrate, zdistance):
          
          pk = CRTPPacket()
          pk.port = CRTPPort.COMMANDER_GENERIC
          pk.data = struct.pack('<Bffff', TYPE_ZDISTANCE,
                                roll, pitch, yawrate, zdistance)
          self._cf.send_packet(pk)
docs: Control mode where the height is send as an absolute setpoint (intended
          to be the distance to the surface under the Crazflie).
  
          Roll, pitch, yawrate are defined as degrees, degrees, degrees/s