link message handling for an upstream link

def master_msg_handling(self, m, master):
        '''link message handling for an upstream link'''
        if self.settings.target_system != 0 and m.get_srcSystem() != self.settings.target_system:
            # don't process messages not from our target
            if m.get_type() == "BAD_DATA":
                if self.mpstate.settings.shownoise and mavutil.all_printable(m.data):
                    self.mpstate.console.write(str(m.data), bg='red')
            return

        if self.settings.target_system != 0 and master.target_system != self.settings.target_system:
            # keep the pymavlink level target system aligned with the MAVProxy setting
            master.target_system = self.settings.target_system

        if self.settings.target_component != 0 and master.target_component != self.settings.target_component:
            # keep the pymavlink level target component aligned with the MAVProxy setting
            print("change target_component %u" % self.settings.target_component)
            master.target_component = self.settings.target_component
            
        mtype = m.get_type()

        if mtype == 'HEARTBEAT' and m.type != mavutil.mavlink.MAV_TYPE_GCS:
            if self.settings.target_system == 0 and self.settings.target_system != m.get_srcSystem():
                self.settings.target_system = m.get_srcSystem()
                self.say("online system %u" % self.settings.target_system,'message')
                for mav in self.mpstate.mav_master:
                    mav.target_system = self.settings.target_system

            if self.status.heartbeat_error:
                self.status.heartbeat_error = False
                self.say("heartbeat OK")
            if master.linkerror:
                master.linkerror = False
                self.say("link %s OK" % (self.link_label(master)))
            self.status.last_heartbeat = time.time()
            master.last_heartbeat = self.status.last_heartbeat

            armed = self.master.motors_armed()
            if armed != self.status.armed:
                self.status.armed = armed
                if armed:
                    self.say("ARMED")
                else:
                    self.say("DISARMED")

            if master.flightmode != self.status.flightmode:
                self.status.flightmode = master.flightmode
                if self.mpstate.functions.input_handler is None:
                    self.set_prompt(self.status.flightmode + "> ")

            if master.flightmode != self.status.last_mode_announced and time.time() > self.status.last_mode_announce + 2:
                    self.status.last_mode_announce = time.time()
                    self.status.last_mode_announced = master.flightmode
                    self.say("Mode " + self.status.flightmode)

            if m.type == mavutil.mavlink.MAV_TYPE_FIXED_WING:
                self.mpstate.vehicle_type = 'plane'
                self.mpstate.vehicle_name = 'ArduPlane'
            elif m.type in [mavutil.mavlink.MAV_TYPE_GROUND_ROVER,
                            mavutil.mavlink.MAV_TYPE_SURFACE_BOAT]:
                self.mpstate.vehicle_type = 'rover'
                self.mpstate.vehicle_name = 'APMrover2'
            elif m.type in [mavutil.mavlink.MAV_TYPE_SUBMARINE]:
                self.mpstate.vehicle_type = 'sub'
                self.mpstate.vehicle_name = 'ArduSub'
            elif m.type in [mavutil.mavlink.MAV_TYPE_QUADROTOR,
                            mavutil.mavlink.MAV_TYPE_COAXIAL,
                            mavutil.mavlink.MAV_TYPE_HEXAROTOR,
                            mavutil.mavlink.MAV_TYPE_OCTOROTOR,
                            mavutil.mavlink.MAV_TYPE_TRICOPTER,
                            mavutil.mavlink.MAV_TYPE_HELICOPTER,
                            mavutil.mavlink.MAV_TYPE_DODECAROTOR]:
                self.mpstate.vehicle_type = 'copter'
                self.mpstate.vehicle_name = 'ArduCopter'
            elif m.type in [mavutil.mavlink.MAV_TYPE_ANTENNA_TRACKER]:
                self.mpstate.vehicle_type = 'antenna'
                self.mpstate.vehicle_name = 'AntennaTracker'

        elif mtype == 'STATUSTEXT':
            if m.text != self.status.last_apm_msg or time.time() > self.status.last_apm_msg_time+2:
                (fg, bg) = self.colors_for_severity(m.severity)
                self.mpstate.console.writeln("APM: %s" % mp_util.null_term(m.text), bg=bg, fg=fg)
                self.status.last_apm_msg = m.text
                self.status.last_apm_msg_time = time.time()

        elif mtype == "VFR_HUD":
            have_gps_lock = False
            if 'GPS_RAW' in self.status.msgs and self.status.msgs['GPS_RAW'].fix_type == 2:
                have_gps_lock = True
            elif 'GPS_RAW_INT' in self.status.msgs and self.status.msgs['GPS_RAW_INT'].fix_type == 3:
                have_gps_lock = True
            if have_gps_lock and not self.status.have_gps_lock and m.alt != 0:
                self.say("GPS lock at %u meters" % m.alt, priority='notification')
                self.status.have_gps_lock = True

        elif mtype == "GPS_RAW":
            if self.status.have_gps_lock:
                if m.fix_type != 2 and not self.status.lost_gps_lock and (time.time() - self.status.last_gps_lock) > 3:
                    self.say("GPS fix lost")
                    self.status.lost_gps_lock = True
                if m.fix_type == 2 and self.status.lost_gps_lock:
                    self.say("GPS OK")
                    self.status.lost_gps_lock = False
                if m.fix_type == 2:
                    self.status.last_gps_lock = time.time()

        elif mtype == "GPS_RAW_INT":
            if self.status.have_gps_lock:
                if m.fix_type < 3 and not self.status.lost_gps_lock and (time.time() - self.status.last_gps_lock) > 3:
                    self.say("GPS fix lost")
                    self.status.lost_gps_lock = True
                if m.fix_type >= 3 and self.status.lost_gps_lock:
                    self.say("GPS OK")
                    self.status.lost_gps_lock = False
                if m.fix_type >= 3:
                    self.status.last_gps_lock = time.time()

        elif mtype == "NAV_CONTROLLER_OUTPUT" and self.status.flightmode == "AUTO" and self.mpstate.settings.distreadout:
            rounded_dist = int(m.wp_dist/self.mpstate.settings.distreadout)*self.mpstate.settings.distreadout
            if math.fabs(rounded_dist - self.status.last_distance_announce) >= self.mpstate.settings.distreadout:
                if rounded_dist != 0:
                    self.say("%u" % rounded_dist, priority="progress")
            self.status.last_distance_announce = rounded_dist

        elif mtype == "GLOBAL_POSITION_INT":
            self.report_altitude(m.relative_alt*0.001)

        elif mtype == "COMPASSMOT_STATUS":
            print(m)

        elif mtype == "SIMSTATE":
            self.mpstate.is_sitl = True

        elif mtype == "ATTITUDE":
            att_time = m.time_boot_ms * 0.001
            self.mpstate.attitude_time_s = max(self.mpstate.attitude_time_s, att_time)
            if self.mpstate.attitude_time_s - att_time > 120:
                # cope with wrap
                self.mpstate.attitude_time_s = att_time

        elif mtype in [ "COMMAND_ACK", "MISSION_ACK" ]:
            self.mpstate.console.writeln("Got MAVLink msg: %s" % m)

            if mtype == "COMMAND_ACK" and m.command == mavutil.mavlink.MAV_CMD_PREFLIGHT_CALIBRATION:
                if m.result == mavutil.mavlink.MAV_RESULT_ACCEPTED:
                    self.say("Calibrated")
                elif m.result == mavutil.mavlink.MAV_RESULT_FAILED:
                    self.say("Calibration failed")
                elif m.result == mavutil.mavlink.MAV_RESULT_UNSUPPORTED:
                    self.say("Calibration unsupported")
                elif m.result == mavutil.mavlink.MAV_RESULT_TEMPORARILY_REJECTED:
                    self.say("Calibration temporarily rejected")
                else:
                    self.say("Calibration response (%u)" % m.result)
        else:
            #self.mpstate.console.writeln("Got MAVLink msg: %s" % m)
            pass

        if self.status.watch is not None:
            for msg_type in self.status.watch:
                if fnmatch.fnmatch(mtype.upper(), msg_type.upper()):
                    self.mpstate.console.writeln('< '+ str(m))
                    break