Globalstar protocol decode possible mistake

yuzz_pol2 years ago

Hi, in version 5.1 the protocol works correctly, processing the coordinates correctly. In the current 5.5 it processes them wrongly, giving a wrong position. I did a comparison of the source codes of both protocols using the files GlobalstarProtocol.java and GlobalstarProtocolDecoder.java and in both versions they are the same. Where can I go to find the problem? I can recompile the latest version with those files, will it change anything?

Anton Tananaev2 years ago

Can you please provide:

  1. Protocol documentation
  2. Logs from version 5.1
  3. Logs from version 5.5
yuzz_pol2 years ago

Version 5.5:

2022-12-15 16:50:48  INFO: [T592fbe5d: globalstar < 34.231.245.76] 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
2022-12-15 16:50:48  INFO: [T592fbe5d: globalstar > 34.231.245.76] 485454502f312e3120323030204f4b0d0a636f6e74656e742d6c656e6774683a203432310d0a636f6e74656e742d747970653a20746578742f786d6c0d0a0d0a
2022-12-15 16:50:48  INFO: [T592fbe5d: globalstar > 34.231.245.76] 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

Decode PAYLOAD:

<payload length="9" source="pc" encoding="hex">0x00C583EFCD371D0A00</payload>

SERVER DECODE:

TSM-SIMPLEX-1	2022-12-15 16:50:56	0.000000°	0.000000°	10.00 km/h

Version 5.1:

2022-12-05 09:04:14  INFO: [Ta1709140: globalstar < 34.231.245.76] 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
2022-12-05 09:04:14  INFO: [Ta1709140: globalstar > 34.231.245.76] 485454502f312e3120323030204f4b0d0a636f6e74656e742d6c656e6774683a203432310d0a636f6e74656e742d747970653a20746578742f786d6c0d0a0d0a
2022-12-05 09:04:14  INFO: [Ta1709140: globalstar > 34.231.245.76] 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

DECODE PAYLOAD:

<payload length="9" source="pc" encoding="hex">0x00C583EACD37210A00</payload>

SERVER DECODE:

TSM-SIMPLEX-1	2022-12-05 09:03:42	-41.122062°	-71.415918°	10.00 km/h

In the LOGS the protocol is found and correctly decoded. But since you have to do a process to convert the payload into coordinates, it seems that something went wrong there.
The documentation is heavy, you should send it by mail.

Anton Tananaev2 years ago

This should fix the problem:

https://github.com/traccar/traccar/commit/ddf72b364323ed3f787fd41c5d5126c3521b96b7

yuzz_pol2 years ago

Thanks a lot! I compile and confirm.

yuzz_pol2 years ago

Thank you! It works like a charm