Request the information of the mission item with the sequence number
                seq. The response of the system to this message should
                be a MISSION_ITEM message.
                http://qgroundcontrol.org/mavlink/waypoint_protocol

                target_system             : System ID (uint8_t)
                target_component          : Component ID (uint8_t)
                seq                       : Sequence (uint16_t)

def mission_request_send(self, target_system, target_component, seq, force_mavlink1=False):
                '''
                Request the information of the mission item with the sequence number
                seq. The response of the system to this message should
                be a MISSION_ITEM message.
                http://qgroundcontrol.org/mavlink/waypoint_protocol

                target_system             : System ID (uint8_t)
                target_component          : Component ID (uint8_t)
                seq                       : Sequence (uint16_t)

                '''
                return self.send(self.mission_request_encode(target_system, target_component, seq), force_mavlink1=force_mavlink1)