#!/usr/bin/python3

from gpsdclient import GPSDClient  # pip3 install gpsdclient

client = GPSDClient()
try:

    # using a with-statement will automatically close file when leaving the scope
    with open('GPS/gps.txt', 'w') as f:

        # get stream of messages from gpsd
        for msg in client.dict_stream():
            if msg['class'] == 'TPV':  # time-position-velocity report
                # for a list of fields that may be available, see:
                # https://gpsd.gitlab.io/gpsd/gpsd_json.html#_tpv
                t = msg.get('time', None)
                let = msg.get('lat', None)
                lon = msg.get('lon', None)
                f.write( f"time={t}, lat={lat}, lon={lon}\n" )

except KeyboardInterrupt:
    # exit gracefully on control-C
    pass

finally:
    # cleanup
    client.close()
    print("Done and now exiting!")