GPS NmeaParser & NmeaGpsModule VM Crash

[FaznetSolutions]

Hi,

I am using Android Things v1.0.1 on the Raspberry Pi 3 with a Adafruit Ultimate GPS Breakout v3 and getting the following after running the GPS for a few minutes:

06-18 07:30:15.677 1590-1590/com.google.android.things.contrib.driver.gps D/AndroidRuntime: Shutting down VM

--------- beginning of crash

06-18 07:30:15.685 1590-1590/com.google.android.things.contrib.driver.gps E/AndroidRuntime: FATAL EXCEPTION: main Process: com.google.android.things.contrib.driver.gps, PID: 1590 java.lang.ArrayIndexOutOfBoundsException: length=19; index=19 at com.google.android.things.contrib.driver.gps.NmeaParser.handleSatelliteData(NmeaParser.java:199) at com.google.android.things.contrib.driver.gps.NmeaParser.processMessageFrame(NmeaParser.java:101) at com.google.android.things.contrib.driver.gps.NmeaGpsModule.handleFrameEnd(NmeaGpsModule.java:206) at com.google.android.things.contrib.driver.gps.NmeaGpsModule.processBuffer(NmeaGpsModule.java:175) at com.google.android.things.contrib.driver.gps.NmeaGpsModule.readUartBuffer(NmeaGpsModule.java:160) at com.google.android.things.contrib.driver.gps.NmeaGpsModule.access$000(NmeaGpsModule.java:41) at com.google.android.things.contrib.driver.gps.NmeaGpsModule$1.onUartDeviceDataAvailable(NmeaGpsModule.java:138) at com.google.android.things.pio.UartDeviceImpl$UartDeviceCallbackDispatch.dispatchInterruptEvent(UartDeviceImpl.java:250) at com.google.android.things.pio.CallbackDispatch.onFileDescriptorEvents(CallbackDispatch.java:149) at android.os.MessageQueue.dispatchEvents(MessageQueue.java:284) at android.os.MessageQueue.nativePollOnce(Native Method) at android.os.MessageQueue.next(MessageQueue.java:325) at android.os.Looper.loop(Looper.java:142) at android.app.ActivityThread.main(ActivityThread.java:6494) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) 06-18 07:30:15.698 1590-1590/com.google.android.things.contrib.driver.gps I/Process: Sending signal. PID: 1590 SIG: 9

I do get the odd Invalid GSV Message logged but otherwise all messages are being received correctly and logged.

Any ideas?

Thank you,

Paul

[devunwired]

This was most likely due to a parsing bug in the driver code, which will be addressed in the next release of the driver.

[FaznetSolutions]

If I comment out sat.snr = parseSignal(nmea[i+3]); within:

        // Parse the satellites in this message
        for (int i = 4; i < 19; i += 4) {
            if (!nmea[i].isEmpty()) {
                Satellite sat = new Satellite();
                sat.svid = Integer.parseInt(nmea[i]);
                sat.elevation = parseTrackAngle(nmea[i+1]);
                sat.azimuth = parseTrackAngle(nmea[i+2]);

                // Next line commented out due to ArrayIndexOutOfBoundsException
//                sat.snr = parseSignal(nmea[i+3]);

then I can run it without the crash for a few hours.

[devunwired]

v1.1 of the GPS driver fixes parsing for variable length GSV messages.