BallonSonde/read_nmea.py

#!/usr/bin/python3

import serial
import time
from pynmeagps import NMEAReader

gga = None
rmc = None
deadline = time.monotonic() + 15

with serial.Serial('/dev/ttyAMA0', 38400, timeout=1) as stream:
    nmr = NMEAReader(stream)

    while time.monotonic() < deadline and (gga is None or rmc is None):
        raw_data, msg = nmr.read()

        if msg is None:
            continue

        if msg.msgID == "GGA":
            gga = msg
        elif msg.msgID == "RMC":
            rmc = msg

if gga is None or rmc is None:
    print("Trame GGA ou RMC manquante")
else:
    print(f"Date : {rmc.date}")
    print(f"Heure_UTC : {rmc.time}")
    print(f"Latitude : {gga.lat} {gga.NS}")
    print(f"Longitude : {gga.lon} {gga.EW}")
    print(f"Altitude : {gga.alt} {gga.altUnit}")