ping-with-gps.py

### Read from VK-162 USB GPS Dongle
# ie. https://www.amazon.com/VK-162-G-Mouse-External-Navigation-Raspberry/dp/B01EROIUEW
# https://www.gpsworld.com/what-exactly-is-gps-nmea-data/
# https://gist.github.com/logston/67e8d1dff12fe194e04812753a871a4f
#
# Example data:
# $GPTXT,01,01,02,u-blox ag - www.u-blox.com*50
# $GPTXT,01,01,02,HW  UBX-G70xx   00070000 FF7FFFFFo*69
# $GPTXT,01,01,02,ROM CORE 1.00 (59842) Jun 27 2012 17:43:52*59
# $GPTXT,01,01,02,PROTVER 14.00*1E
# $GPTXT,01,01,02,ANTSUPERV=AC SD PDoS SR*20
# $GPTXT,01,01,02,ANTSTATUS=OK*3B
# $GPTXT,01,01,02,LLC FFFFFFFF-FFFFFFFF-FFFFFFFF-FFFFFFFF-FFFFFFFD*2C
# $GPRMC,232047.00,A,3751.53046,N,12207.76361,W,0.795,,080924,,,A*69
# $GPVTG,,T,,M,0.795,N,1.472,K,A*28
# $GPGGA,232047.00,3751.53046,N,12207.76361,W,1,05,1.84,252.3,M,-29.3,M,,*62
# $GPGSA,A,3,03,16,09,04,07,,,,,,,,3.27,1.84,2.71*03
# $GPGSV,3,1,09,01,31,062,27,02,05,200,09,03,75,178,31,04,63,330,21*73
# $GPGSV,3,2,09,07,18,234,28,09,33,297,26,16,41,118,27,26,38,069,08*76
# $GPGSV,3,3,09,31,33,048,08*46
# $GPGLL,3751.53046,N,12207.76361,W,232047.00,A,A*7C
# $GPRMC,232048.00,A,3751.53024,N,12207.76363,W,0.657,,080924,,,A*6F
from datetime import datetime
import subprocess


def read_block(device_path: str) -> list[str]:
    """
    Return block of GPS lines from device.
    """
    with open(device_path) as fp:
        should_break = False
        block = []
        while line := fp.readline():
            line = line.strip()

            if line.startswith('$GPTXT'):
                continue

            if line.startswith('$GPRMC'):
                if should_break:
                    break
                should_break = True

            block.append(line)

    return block


def ping(url: str) -> (str, str):
    try:
        out = subprocess.run(
            f"ping -c 1 {url}".split(),
            capture_output=True,
            timeout=5,  # seconds
        )
        stdout = out.stdout.decode()
        stderr = out.stderr.decode()
    except subprocess.TimeoutExpired as e:
        stdout = ""
        stderr = str(e)

    return stdout, stderr


def main(gps_device_path, url):
    while True:
        now = datetime.now().isoformat()
        gps_block = '\n'.join(read_block(gps_device_path))
        stdout, stderr = ping(url)

        print('=' * 10, flush=True)
        print(now, flush=True)
        print('-' * 10, flush=True)
        print(gps_block, flush=True)
        print('-' * 10, flush=True)
        print(stdout, flush=True)
        print('-' * 10, flush=True)
        print(stderr, flush=True)


if __name__ == '__main__':
    import argparse

    parser = argparse.ArgumentParser()
    parser.add_argument('device_path', help='eg. /dev/cu.usbmodem2101')
    parser.add_argument('url')
    args = parser.parse_args()

    main(args.device_path, args.url)