GNSS module do not working with python UBX parser, but working with u-center

[KerteszDomokos]

Hello,

I have an error with my GNSS module. I use it with an usb-uart driver, and when I connect it to my computer, and read datas with u-center I get continously updated position information, but when I try to read the same data with python (on a raspberry pi 5 device), I get the same datas for long minutes.
The UBX messages are coming perfectly in python, but the datas are absolutely the same for too long times (I tested it more than half an hour). When I switch to the u-center I get new position informations (in a few minute), but when I reconnect trough python I do not get updated data.

I had more errors (and less usable information) using NMEA, so thats why I use UBX

Hardware:

• Goku GM10 GNSS module (Ublox M10 proc) docs: https://content.u-blox.com/sites/default/files/MAX-M10S_IntegrationManual_UBX-20053088.pdf
• Standard CH341T USB-TTL converter

Configuration (writed to the FLASH):

• CFG-MSGOUT
  • UBX-NAV-PVT-UART1: 1
  • UBX-NAV-SAT-UART1: 1
  • UBX-NAV-STATUS-UART1: 1
  • UBX-NAV-TIMEUTC
• CFG-UART1OUTPROT
  • UBX: 1
  • NMEA: 0

These seem to be OK, because I get this types of messages in u-center and in python too.

Software:

• u-center 23.10.78326
• Python 3.11
• pyubx2 library 1.2.36

There is a simple code:
Sending configuration is not working as I experienced, but this is not my main error

    import serial
    from pyubx2 import UBXReader, UBXMessage, GET
    import time
    
    def parsed_tofile(parsed_data):
        with open('tests/parsed.log', 'a') as f:
            f.write(f"{parsed_data}\n")
    
    def print_telemetry(telemetry, parsed_data):
        print("Telemetry Data:")
        print(f"Altitude: {telemetry.get('altitude')}")
        print(f"Latitude: {telemetry.get('latitude')}")
        print(f"Longitude: {telemetry.get('longitude')}")
        print(f"Fix Quality: {telemetry.get('fix')}")
        print(f"Horizontal Dilution of Precision: {telemetry.get('hdop')}")
        print(f"Time: {telemetry.get('time')}")
        print(f"Date: {telemetry.get('time_date')}")
        print(f"HDOP: {telemetry.get('hdop')}")
        print(f"VDOP: {telemetry.get('vdop')}")
        print(f"Speed: {telemetry.get('speed')}")
        print(f"Satellite Number: {telemetry.get('satnum')}")
        print(f"Course Over Ground: {telemetry.get('cog')}")
        print(f"Message: {parsed_data}")
    
    
        
    def send_binary_command(serial_port, message):
        serial_port.write(message)
        print("Binary message sent")
        time.sleep(1)
    
    MON_VER = bytes.fromhex('B5 62 0A 04 00 00 0E 34')
    CLD_RT = bytes.fromhex('B5 62 06 04 04 00 FF FF 13 7A')
    ENA_NAV_PVT=bytes.fromhex('B5 62 06 01 08 00 01 07 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 13 51')
    ENA_NAV_SAT=bytes.fromhex('B5 62 06 01 08 00 01 35 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 2B 87')
    CFG_VALGET=bytes.fromhex('B5 62 06 8B 08 00 00 00 00 00 1F 00 31 10 F9 7F')
    telemetry = {}
    
    with serial.Serial('/dev/ttyUSB0', 115200, timeout=1) as ser:
        # send_binary_command(ser, CLD_RT)
        # send_binary_command(ser, MON_VER)
        # send_binary_command(ser, enable_NAV_PVT)
        # send_binary_command(ser, enable_NAV_SAT)
        
        ubr = UBXReader(ser, GET)
        print("UBXReader created")
    
        while True:
            (raw_data, parsed_data) = ubr.read()
            if isinstance(parsed_data, UBXMessage):
                # print(f"UBX Message: {parsed_data}")
    
                if parsed_data.identity == 'NAV-PVT':
                    telemetry.update({
                        'altitude': parsed_data.height,
                        'longitude': parsed_data.lon,
                        'latitude': parsed_data.lat
                    })
    
                elif parsed_data.identity == 'NAV-TIMEUTC':
                    telemetry.update({
                        'time': f"{parsed_data.hour}:{parsed_data.min}:{parsed_data.sec}",
                        'time_date': f"{parsed_data.year}-{parsed_data.month}-{parsed_data.day}"
                    })
                    
                elif parsed_data.identity == 'NAV-SAT':
                    telemetry.update({'satnum': parsed_data.numSvs})
    
                elif parsed_data.identity == 'NAV-DOP':
                    telemetry.update({
                        'hdop': parsed_data.hDOP,
                        'vdop': parsed_data.vDOP
                    })
    
                elif parsed_data.identity == 'NAV-STATUS':
                    telemetry.update({
                        'fix': parsed_data.gpsFix
                    })
                print_telemetry(telemetry, ser.in_waiting)
                parsed_tofile(parsed_data)

There is some readed data from parsed.log file:

    <UBX(NAV-PVT, iTOW=13:36:13, year=2024, month=2, day=4, hour=13, min=36, second=13, validDate=1, validTime=1, fullyResolved=0, validMag=0, tAcc=4294967295, nano=-294218, fixType=0, gnssFixOk=0, difSoln=0, psmState=0, headVehValid=0, carrSoln=0, confirmedAvai=1, confirmedDate=0, confirmedTime=0, numSV=0, lon=19.xxxxxxx, lat=47.xxxxxxx, height=193693, hMSL=154493, hAcc=8180710, vAcc=5784636, velN=0, velE=0, velD=0, gSpeed=0, headMot=0.0, sAcc=20000, headAcc=180.0, pDOP=99.99, invalidLlh=0, lastCorrectionAge=0, reserved0=794181724, headVeh=0.0, magDec=0.0, magAcc=0.0)>
    <UBX(NAV-SAT, iTOW=13:36:13, version=1, numSvs=13, reserved0=0, gnssId_01=GPS, svId_01=11, cno_01=0, elev_01=37, azim_01=60, prRes_01=0.0, qualityInd_01=1, svUsed_01=0, health_01=1, diffCorr_01=0, smoothed_01=0, orbitSource_01=2, ephAvail_01=0, almAvail_01=1, anoAvail_01=0, aopAvail_01=0, sbasCorrUsed_01=0, rtcmCorrUsed_01=0, slasCorrUsed_01=0, spartnCorrUsed_01=0, prCorrUsed_01=0, crCorrUsed_01=0, doCorrUsed_01=0, gnssId_02=GPS, svId_02=12, cno_02=0, elev_02=47, azim_02=97, prRes_02=0.0, qualityInd_02=1, svUsed_02=0, health_02=1, diffCorr_02=0, smoothed_02=0, orbitSource_02=1, ephAvail_02=1, almAvail_02=0, anoAvail_02=0, aopAvail_02=0, sbasCorrUsed_02=0, rtcmCorrUsed_02=0, slasCorrUsed_02=0, spartnCorrUsed_02=0, prCorrUsed_02=0, crCorrUsed_02=0, doCorrUsed_02=0, gnssId_03=GPS, svId_03=25, cno_03=0, elev_03=82, azim_03=62, prRes_03=0.0, qualityInd_03=1, svUsed_03=0, health_03=1, diffCorr_03=0, smoothed_03=0, orbitSource_03=1, ephAvail_03=1, almAvail_03=0, anoAvail_03=0, aopAvail_03=0, sbasCorrUsed_03=0, rtcmCorrUsed_03=0, slasCorrUsed_03=0, spartnCorrUsed_03=0, prCorrUsed_03=0, crCorrUsed_03=0, doCorrUsed_03=0, gnssId_04=GPS, svId_04=28, cno_04=0, elev_04=45, azim_04=297, prRes_04=0.0, qualityInd_04=1, svUsed_04=0, health_04=1, diffCorr_04=0, smoothed_04=0, orbitSource_04=1, ephAvail_04=1, almAvail_04=0, anoAvail_04=0, aopAvail_04=0, sbasCorrUsed_04=0, rtcmCorrUsed_04=0, slasCorrUsed_04=0, spartnCorrUsed_04=0, prCorrUsed_04=0, crCorrUsed_04=0, doCorrUsed_04=0, gnssId_05=GPS, svId_05=29, cno_05=0, elev_05=61, azim_05=238, prRes_05=0.0, qualityInd_05=1, svUsed_05=0, health_05=1, diffCorr_05=0, smoothed_05=0, orbitSource_05=1, ephAvail_05=1, almAvail_05=0, anoAvail_05=0, aopAvail_05=0, sbasCorrUsed_05=0, rtcmCorrUsed_05=0, slasCorrUsed_05=0, spartnCorrUsed_05=0, prCorrUsed_05=0, crCorrUsed_05=0, doCorrUsed_05=0, gnssId_06=GPS, svId_06=31, cno_06=0, elev_06=23, azim_06=314, prRes_06=0.0, qualityInd_06=1, svUsed_06=0, health_06=1, diffCorr_06=0, smoothed_06=0, orbitSource_06=2, ephAvail_06=0, almAvail_06=1, anoAvail_06=0, aopAvail_06=0, sbasCorrUsed_06=0, rtcmCorrUsed_06=0, slasCorrUsed_06=0, spartnCorrUsed_06=0, prCorrUsed_06=0, crCorrUsed_06=0, doCorrUsed_06=0, gnssId_07=GPS, svId_07=32, cno_07=0, elev_07=12, azim_07=247, prRes_07=0.0, qualityInd_07=1, svUsed_07=0, health_07=1, diffCorr_07=0, smoothed_07=0, orbitSource_07=1, ephAvail_07=1, almAvail_07=1, anoAvail_07=0, aopAvail_07=0, sbasCorrUsed_07=0, rtcmCorrUsed_07=0, slasCorrUsed_07=0, spartnCorrUsed_07=0, prCorrUsed_07=0, crCorrUsed_07=0, doCorrUsed_07=0, gnssId_08=SBAS, svId_08=123, cno_08=0, elev_08=34, azim_08=164, prRes_08=0.0, qualityInd_08=1, svUsed_08=0, health_08=0, diffCorr_08=0, smoothed_08=0, orbitSource_08=7, ephAvail_08=0, almAvail_08=0, anoAvail_08=0, aopAvail_08=0, sbasCorrUsed_08=0, rtcmCorrUsed_08=0, slasCorrUsed_08=0, spartnCorrUsed_08=0, prCorrUsed_08=0, crCorrUsed_08=0, doCorrUsed_08=0, gnssId_09=SBAS, svId_09=126, cno_09=0, elev_09=21, azim_09=127, prRes_09=0.0, qualityInd_09=1, svUsed_09=0, health_09=0, diffCorr_09=0, smoothed_09=0, orbitSource_09=7, ephAvail_09=0, almAvail_09=0, anoAvail_09=0, aopAvail_09=0, sbasCorrUsed_09=0, rtcmCorrUsed_09=0, slasCorrUsed_09=0, spartnCorrUsed_09=0, prCorrUsed_09=0, crCorrUsed_09=0, doCorrUsed_09=0, gnssId_10=SBAS, svId_10=127, cno_10=0, elev_10=25, azim_10=136, prRes_10=0.0, qualityInd_10=1, svUsed_10=0, health_10=0, diffCorr_10=0, smoothed_10=0, orbitSource_10=7, ephAvail_10=0, almAvail_10=0, anoAvail_10=0, aopAvail_10=0, sbasCorrUsed_10=0, rtcmCorrUsed_10=0, slasCorrUsed_10=0, spartnCorrUsed_10=0, prCorrUsed_10=0, crCorrUsed_10=0, doCorrUsed_10=0, gnssId_11=SBAS, svId_11=128, cno_11=0, elev_11=9, azim_11=110, prRes_11=0.0, qualityInd_11=1, svUsed_11=0, health_11=0, diffCorr_11=0, smoothed_11=0, orbitSource_11=7, ephAvail_11=0, almAvail_11=0, anoAvail_11=0, aopAvail_11=0, sbasCorrUsed_11=0, rtcmCorrUsed_11=0, slasCorrUsed_11=0, spartnCorrUsed_11=0, prCorrUsed_11=0, crCorrUsed_11=0, doCorrUsed_11=0, gnssId_12=SBAS, svId_12=136, cno_12=0, elev_12=34, azim_12=199, prRes_12=0.0, qualityInd_12=1, svUsed_12=0, health_12=0, diffCorr_12=0, smoothed_12=0, orbitSource_12=7, ephAvail_12=0, almAvail_12=0, anoAvail_12=0, aopAvail_12=0, sbasCorrUsed_12=0, rtcmCorrUsed_12=0, slasCorrUsed_12=0, spartnCorrUsed_12=0, prCorrUsed_12=0, crCorrUsed_12=0, doCorrUsed_12=0, gnssId_13=BeiDou, svId_13=17, cno_13=0, elev_13=-91, azim_13=0, prRes_13=0.0, qualityInd_13=1, svUsed_13=0, health_13=0, diffCorr_13=0, smoothed_13=0, orbitSource_13=0, ephAvail_13=0, almAvail_13=0, anoAvail_13=0, aopAvail_13=0, sbasCorrUsed_13=0, rtcmCorrUsed_13=0, slasCorrUsed_13=0, spartnCorrUsed_13=0, prCorrUsed_13=0, crCorrUsed_13=0, doCorrUsed_13=0)>
    <UBX(NAV-STATUS, iTOW=13:36:13, gpsFix=0, gpsFixOk=0, diffSoln=0, wknSet=1, towSet=1, diffCorr=0, carrSolnValid=0, mapMatching=0, psmState=0, spoofDetState=1, carrSoln=0, ttff=0, msss=288275)>
    <UBX(NAV-TIMEUTC, iTOW=13:36:13, tAcc=4294967295, nano=-294218, year=2024, month=2, day=4, hour=13, min=36, sec=13, validTOW=1, validWKN=1, validUTC=0, utcStandard=15)>
    <UBX(NAV-PVT, iTOW=13:36:13.500000, year=2024, month=2, day=4, hour=13, min=36, second=13, validDate=1, validTime=1, fullyResolved=0, validMag=0, tAcc=4294967295, nano=499705407, fixType=0, gnssFixOk=0, difSoln=0, psmState=0, headVehValid=0, carrSoln=0, confirmedAvai=1, confirmedDate=0, confirmedTime=0, numSV=0, lon=19.xxxxxxx, lat=47.xxxxxxx, height=193693, hMSL=154493, hAcc=8194805, vAcc=5794602, velN=0, velE=0, velD=0, gSpeed=0, headMot=0.0, sAcc=20000, headAcc=180.0, pDOP=99.99, invalidLlh=0, lastCorrectionAge=0, reserved0=794181724, headVeh=0.0, magDec=0.0, magAcc=0.0)>
    <UBX(NAV-SAT, iTOW=13:36:13.500000, version=1, numSvs=12, reserved0=0, gnssId_01=GPS, svId_01=11, cno_01=0, elev_01=37, azim_01=60, prRes_01=0.0, qualityInd_01=1, svUsed_01=0, health_01=1, diffCorr_01=0, smoothed_01=0, orbitSource_01=2, ephAvail_01=0, almAvail_01=1, anoAvail_01=0, aopAvail_01=0, sbasCorrUsed_01=0, rtcmCorrUsed_01=0, slasCorrUsed_01=0, spartnCorrUsed_01=0, prCorrUsed_01=0, crCorrUsed_01=0, doCorrUsed_01=0, gnssId_02=GPS, svId_02=12, cno_02=0, elev_02=47, azim_02=97, prRes_02=0.0, qualityInd_02=1, svUsed_02=0, health_02=1, diffCorr_02=0, smoothed_02=0, orbitSource_02=1, ephAvail_02=1, almAvail_02=0, anoAvail_02=0, aopAvail_02=0, sbasCorrUsed_02=0, rtcmCorrUsed_02=0, slasCorrUsed_02=0, spartnCorrUsed_02=0, prCorrUsed_02=0, crCorrUsed_02=0, doCorrUsed_02=0, gnssId_03=GPS, svId_03=25, cno_03=0, elev_03=82, azim_03=62, prRes_03=0.0, qualityInd_03=1, svUsed_03=0, health_03=1, diffCorr_03=0, smoothed_03=0, orbitSource_03=1, ephAvail_03=1, almAvail_03=0, anoAvail_03=0, aopAvail_03=0, sbasCorrUsed_03=0, rtcmCorrUsed_03=0, slasCorrUsed_03=0, spartnCorrUsed_03=0, prCorrUsed_03=0, crCorrUsed_03=0, doCorrUsed_03=0, gnssId_04=GPS, svId_04=28, cno_04=0, elev_04=45, azim_04=297, prRes_04=0.0, qualityInd_04=1, svUsed_04=0, health_04=1, diffCorr_04=0, smoothed_04=0, orbitSource_04=1, ephAvail_04=1, almAvail_04=0, anoAvail_04=0, aopAvail_04=0, sbasCorrUsed_04=0, rtcmCorrUsed_04=0, slasCorrUsed_04=0, spartnCorrUsed_04=0, prCorrUsed_04=0, crCorrUsed_04=0, doCorrUsed_04=0, gnssId_05=GPS, svId_05=29, cno_05=0, elev_05=61, azim_05=238, prRes_05=0.0, qualityInd_05=1, svUsed_05=0, health_05=1, diffCorr_05=0, smoothed_05=0, orbitSource_05=1, ephAvail_05=1, almAvail_05=0, anoAvail_05=0, aopAvail_05=0, sbasCorrUsed_05=0, rtcmCorrUsed_05=0, slasCorrUsed_05=0, spartnCorrUsed_05=0, prCorrUsed_05=0, crCorrUsed_05=0, doCorrUsed_05=0, gnssId_06=GPS, svId_06=31, cno_06=0, elev_06=23, azim_06=314, prRes_06=0.0, qualityInd_06=1, svUsed_06=0, health_06=1, diffCorr_06=0, smoothed_06=0, orbitSource_06=2, ephAvail_06=0, almAvail_06=1, anoAvail_06=0, aopAvail_06=0, sbasCorrUsed_06=0, rtcmCorrUsed_06=0, slasCorrUsed_06=0, spartnCorrUsed_06=0, prCorrUsed_06=0, crCorrUsed_06=0, doCorrUsed_06=0, gnssId_07=GPS, svId_07=32, cno_07=0, elev_07=12, azim_07=247, prRes_07=0.0, qualityInd_07=1, svUsed_07=0, health_07=1, diffCorr_07=0, smoothed_07=0, orbitSource_07=1, ephAvail_07=1, almAvail_07=1, anoAvail_07=0, aopAvail_07=0, sbasCorrUsed_07=0, rtcmCorrUsed_07=0, slasCorrUsed_07=0, spartnCorrUsed_07=0, prCorrUsed_07=0, crCorrUsed_07=0, doCorrUsed_07=0, gnssId_08=SBAS, svId_08=123, cno_08=0, elev_08=34, azim_08=164, prRes_08=0.0, qualityInd_08=1, svUsed_08=0, health_08=0, diffCorr_08=0, smoothed_08=0, orbitSource_08=7, ephAvail_08=0, almAvail_08=0, anoAvail_08=0, aopAvail_08=0, sbasCorrUsed_08=0, rtcmCorrUsed_08=0, slasCorrUsed_08=0, spartnCorrUsed_08=0, prCorrUsed_08=0, crCorrUsed_08=0, doCorrUsed_08=0, gnssId_09=SBAS, svId_09=126, cno_09=0, elev_09=21, azim_09=127, prRes_09=0.0, qualityInd_09=1, svUsed_09=0, health_09=0, diffCorr_09=0, smoothed_09=0, orbitSource_09=7, ephAvail_09=0, almAvail_09=0, anoAvail_09=0, aopAvail_09=0, sbasCorrUsed_09=0, rtcmCorrUsed_09=0, slasCorrUsed_09=0, spartnCorrUsed_09=0, prCorrUsed_09=0, crCorrUsed_09=0, doCorrUsed_09=0, gnssId_10=SBAS, svId_10=127, cno_10=0, elev_10=25, azim_10=136, prRes_10=0.0, qualityInd_10=1, svUsed_10=0, health_10=0, diffCorr_10=0, smoothed_10=0, orbitSource_10=7, ephAvail_10=0, almAvail_10=0, anoAvail_10=0, aopAvail_10=0, sbasCorrUsed_10=0, rtcmCorrUsed_10=0, slasCorrUsed_10=0, spartnCorrUsed_10=0, prCorrUsed_10=0, crCorrUsed_10=0, doCorrUsed_10=0, gnssId_11=SBAS, svId_11=128, cno_11=0, elev_11=9, azim_11=110, prRes_11=0.0, qualityInd_11=1, svUsed_11=0, health_11=0, diffCorr_11=0, smoothed_11=0, orbitSource_11=7, ephAvail_11=0, almAvail_11=0, anoAvail_11=0, aopAvail_11=0, sbasCorrUsed_11=0, rtcmCorrUsed_11=0, slasCorrUsed_11=0, spartnCorrUsed_11=0, prCorrUsed_11=0, crCorrUsed_11=0, doCorrUsed_11=0, gnssId_12=SBAS, svId_12=136, cno_12=0, elev_12=34, azim_12=199, prRes_12=0.0, qualityInd_12=1, svUsed_12=0, health_12=0, diffCorr_12=0, smoothed_12=0, orbitSource_12=7, ephAvail_12=0, almAvail_12=0, anoAvail_12=0, aopAvail_12=0, sbasCorrUsed_12=0, rtcmCorrUsed_12=0, slasCorrUsed_12=0, spartnCorrUsed_12=0, prCorrUsed_12=0, crCorrUsed_12=0, doCorrUsed_12=0)>
    <UBX(NAV-STATUS, iTOW=13:36:13.500000, gpsFix=0, gpsFixOk=0, diffSoln=0, wknSet=1, towSet=1, diffCorr=0, carrSolnValid=0, mapMatching=0, psmState=0, spoofDetState=1, carrSoln=0, ttff=0, msss=288775)>
    <UBX(NAV-TIMEUTC, iTOW=13:36:13.500000, tAcc=4294967295, nano=499705407, year=2024, month=2, day=4, hour=13, min=36, sec=13, validTOW=1, validWKN=1, validUTC=0, utcStandard=15)>

(I deleted my position data)

I would be greatful, if you could help me.

Thanks!

EDIT:
I tested the device and the same program on a windows device, and here it is working perfectly. The error may could be a linux specified problem?

[semuadmin]

Hi @KerteszDomokos

Ok a few observations:

1. Check your UART baud rate is correct - the default is 38400, not 115200, so unless you've changed this explicitly your serial read will not work - you'll probably just get garbage.
2. As you've mentioned, your command byte sequences may not be correct. You may find it helpful to use the UBXMessage.config_set() command to create the necessary CFG-VALSET message(s) and send the serialised messages to the UART port. See the README for examples.
3. If you're sending and receiving messages over a serial port in the same thread, there's no guarantee that the receiver will process them in the order intended. Adding a short delay after command sends (as you've done) may help, but it's not foolproof. For a more robust multi-threaded approach, see this simple example.
4. Your code is more or less there, but I've made a few tweaks - see below:

from time import sleep

from serial import Serial

from pyubx2 import FIXTYPE, GET, UBXMessage, UBXReader

PORT = "/dev/ttyUSB0" # amend as required
BAUD = 115200  # check this is correct for your receiver port - the default is 38400
TIMEOUT = 5

# check these command sequences are correct
# you might find it helpful to use the `UBXMessage.config_set()`
# command to create the necessary CFG-VALSET messages
MON_VER = bytes.fromhex("B5 62 0A 04 00 00 0E 34")
CLD_RT = bytes.fromhex("B5 62 06 04 04 00 FF FF 13 7A")
ENA_NAV_PVT = bytes.fromhex(
    "B5 62 06 01 08 00 01 07 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 13 51"
)
ENA_NAV_SAT = bytes.fromhex(
    "B5 62 06 01 08 00 01 35 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 2B 87"
)
CFG_VALGET = bytes.fromhex("B5 62 06 8B 08 00 00 00 00 00 1F 00 31 10 F9 7F")


def print_telemetry(tmy, data):
    print("Telemetry Data:")
    print(f"Altitude: {tmy.get('altitude')}")
    print(f"Latitude: {tmy.get('latitude')}")
    print(f"Longitude: {tmy.get('longitude')}")
    print(f"Fix Quality: {tmy.get('fix')}")
    print(f"Horizontal Dilution of Precision: {tmy.get('hdop')}")
    print(f"Time: {tmy.get('time')}")
    print(f"Date: {tmy.get('time_date')}")
    print(f"HDOP: {tmy.get('hdop')}")
    print(f"VDOP: {tmy.get('vdop')}")
    print(f"Speed: {tmy.get('speed')}")
    print(f"Satellite Number: {tmy.get('satnum')}")
    print(f"Course Over Ground: {tmy.get('cog')}")
    print(f"Message: {data}")


def send_binary_command(serial_port, message):
    serial_port.write(message)
    print("Binary message sent")
    sleep(1)


try:

    with open("parsed.log", "w", encoding="UTF-8") as outfile:
        with Serial(PORT, BAUD, timeout=TIMEOUT) as ser:
            # send_binary_command(ser, CLD_RT)
            # send_binary_command(ser, MON_VER)
            # send_binary_command(ser, ENA_NAV_PVT)
            # send_binary_command(ser, ENA_NAV_SAT)

            count = 0
            telemetry = {}
            ubr = UBXReader(ser, GET)
            print("UBXReader created")

            for raw_data, parsed_data in ubr:
                if isinstance(parsed_data, UBXMessage):
                    count += 1
                    # print(f"UBX Message: {parsed_data}")

                    if parsed_data.identity == "NAV-PVT":
                        telemetry["altitude"] = parsed_data.height
                        telemetry["longitude"] = parsed_data.lon
                        telemetry["latitude"] = parsed_data.lat
                        telemetry["time"] = (
                            f"{parsed_data.hour:02d}:{parsed_data.min:02d}:{parsed_data.second:02d}"
                        )
                        telemetry["time_date"] = (
                            f"{parsed_data.year}-{parsed_data.month:02d}-{parsed_data.day:02d}"
                        )
                        telemetry["fix"] = FIXTYPE[parsed_data.fixType]
                        telemetry["speed"] = parsed_data.gSpeed
                        telemetry["cog"] = parsed_data.headMot # strictly heading rather than course

                    elif parsed_data.identity == "NAV-SAT":
                        telemetry["satnum"] = parsed_data.numSvs

                    elif parsed_data.identity == "NAV-DOP":
                        telemetry["hdop"] = parsed_data.hDOP
                        telemetry["vdop"] = parsed_data.vDOP

                    print_telemetry(telemetry, parsed_data)

                    # use str() if you want to save parsed_data to a text file
                    # if you want to save the raw_data, open the file as "wb"
                    outfile.write(str(parsed_data))  

except KeyboardInterrupt:
    print(f"\nTerminated by user - {count} UBX messages read")

[KerteszDomokos]

Hi @semuadmin
Thanks for your answer, using the lib's built-in functions is a better way, thanks. (it is working now)

The serial speed and port is definitely correct, because I can read the sentences.
Since I posted my question, I specified my issue, and it is not the lib's bug, but if you have some idea, I would be greatful.

The problem is presented, when I use the Raspberry pi to read the data (the baud and port is correct). The senteces are delivered to the RPI, and the program process this datas correctly, but the datas are not changing (tested for 1+ hour), they are same with the last read on the computer. If I use my computer, it will changing, and working correctly, but on raspberry pi, I can not read up-to-date datas.

I tried to use a secondary power source, but I got the same error.

Is there any idea, what should I test for fixing the problem?
Thanks!

[semuadmin]

Hi @KerteszDomokos ,

I'm not sure I can account for why the data isn't changing for you - the cope snippet above works fine on a Raspberry Pi 4 (I don't currently have a RPI 5 to test on). I can only guess that this is some kind of local TTL-USB or serial config issue, or possibly an incorrect flashed UBX configuration. Out of interest, what operating system are you running on the RPi 5?

I can only suggest one or more of the following diagnostic checks:

1. Factory-reset the Goku GM10 module and try monitoring the output on the RPi 5 using a standard terminal monitor (i.e. without using any Python code) e.g. screen:

   screen /dev/ttyUSB0 38400
   
   $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,5*37  
   $GPGSV,2,1,06,13,,,36,14,,,43,15,,,45,17,,,41,1*62
   $GPGSV,2,2,06,22,,,49,30,,,43,1*6B
   $GLGSV,1,1,03,,,,43,,,,32,,,,30,1*7E
   $GAGSV,1,1,00,0*74
   $GBGSV,1,1,02,23,,,40,25,,,41,1*73
   $GQGSV,1,1,00,0*64
   $GNGLL,,,,,080716.00,V,N*5C
   $GNRMC,080717.00,V,,,,,,,050224,,,N,V*11

   (Type Ctrl-a and then k to terminate the screen session. If you don't have screen installed, try sudo cu -s 38400 -l /dev/ttyUSB0, terminate using ~.)

2. Check you've enabled UBX messages on the correct port(s) for your RPi 5 configuration (e.g. UART1 instead of, or as well as, USB).

3. Ensure the TTL-USB converter is supplying the correct voltage to the Goku GM10 module.

4. Ensure you have installed the correct CH341T drivers for your TTL-USB convertor (if they're not already pre-installed).

5. Ensure you don't have any other daemon process(es) running on the RPi 5 which might cause a serial port conflict e.g. gpsd.

6. Ensure you have appropriate permissions on the RPi 5 to read from the serial port (i.e. you are a member of the tty and/or dialout groups - e.g. usermod -a -G tty myuser)

7. Try using a different brand of TTL-USB converter (e.g. an FTDI FT232-based adapter) - in my experience the cheap CH341 adapters are often unreliable on some platforms.

8. Try connecting the Goku GM10 module directly to the RPi 5's RX/TX GPIO pins (pins 8 & 10), rather than using a TTL-USB convertor.

9. Try Installing the pygnssutils library and using the gnssdump utility to monitor the receiver's output:

   python3 -m pip install pygnssutils
   gnssdump --port /dev/ttyUSB0 --baudrate 115200 --timeout 5
   2024-02-05 08:15:27.217121: Parsing GNSS data stream from: Serial<id=0x10068d990, open=True>(port='/dev/ttyUSB0, baudrate=115200, bytesize=8, parity='N', stopbits=1, timeout=5, xonxoff=False, rtscts=False, dsrdtr=False)...

Hope this helps

[KerteszDomokos]

Thank you for your useful ideas, I'm testing this method as torogh and soon as I can. If I solve, or find another useful informations about this issue, I'll post it here.
Thanks!

[KerteszDomokos]

Thanks for your help @semuadmin!
I solved my issue.
I was using an ssd drive to boot the system, and and depend on the lsusb command, it was useing about 800mA. My GNSS module uses 200mA according to the datasheet, so I wasn't worried about powering the device. I tested my programs and my hardware without using external drive, and it was worked (kept sending updated data).
So I removed the external drive, but because I must have a big space for my project, so I had to find another solution.
Since I use Raspberry Pi 5, I have a PCIe connector, and I bought an M.2 SSD and a shield, this solution gives me a fast and large storage, and I can use the USB port to power and use the GNSS module.

The solution could be cheaper, but it's working fine and very fast.

Thanks for the help!