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Compressed location details #58

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opened 2026-10-05 05:32:36 +02:00 by adam · 7 comments
adam commented 2026-10-05 05:32:36 +02:00
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I noticed on the TTGO screen and in the syslog output that compressed data results in a longitude and latitude of 0.00N, 0.00E.
The raw data is sent to the APRS IS servers without any problem, they handle it from there :-)

But is seems on screen that some stations are 5700 km away, while in reality it is just 4km.
I had the problem too, so I attached a bit of ugly code :
APRS_compressed.txt

I test first if it is compressed data, if so, then proceed to correct function.

I noticed on the TTGO screen and in the syslog output that compressed data results in a longitude and latitude of 0.00N, 0.00E. The raw data is sent to the APRS IS servers without any problem, they handle it from there :-) But is seems on screen that some stations are 5700 km away, while in reality it is just 4km. I had the problem too, so I attached a bit of ugly code : [APRS_compressed.txt](https://github.com/richonguzman/LoRa_APRS_iGate/files/15137345/APRS_compressed.txt) I test first if it is compressed data, if so, then proceed to correct function. <!-- github-sync-id:2266877671 -->
adam closed this issue 2026-10-05 05:32:36 +02:00
adam commented 2026-10-05 05:32:37 +02:00
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I'll need to clarify it a bit. Using the tracker that also sends compressed data I didn't noticed the wrong location data. Some bug that it occures in rare situations?

I'll need to clarify it a bit. Using the tracker that also sends compressed data I didn't noticed the wrong location data. Some bug that it occures in rare situations? <!-- github-comment-id:2080815408 -->
adam commented 2026-10-05 05:32:38 +02:00
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Hi

Could it be that the gps data inserted in webconfig page was 0.0, 0.0?

Or wrong values with "," instead of "."

Some send data with 0.0 , 0.0 to avoid being seen

Hi Could it be that the gps data inserted in webconfig page was 0.0, 0.0? Or wrong values with "," instead of "." Some send data with 0.0 , 0.0 to avoid being seen <!-- github-comment-id:2081296610 -->
adam commented 2026-10-05 05:32:38 +02:00
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I added a file with details. I hope that it help to explain it a bit :-)

differences.txt

I added a file with details. I hope that it help to explain it a bit :-) [differences.txt](https://github.com/richonguzman/LoRa_APRS_iGate/files/15142338/differences.txt) <!-- github-comment-id:2081492109 -->
adam commented 2026-10-05 05:32:39 +02:00
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I added a file with details. I hope that it help to explain it a bit :-)

differences.txt

so, I should add the comment extracted from LoRaPacket and add it at the last part of the syslog log packet?

> I added a file with details. I hope that it help to explain it a bit :-) > > [differences.txt](https://github.com/richonguzman/LoRa_APRS_iGate/files/15142338/differences.txt) so, I should add the comment extracted from LoRaPacket and add it at the last part of the syslog log packet? <!-- github-comment-id:2081493354 -->
adam commented 2026-10-05 05:32:40 +02:00
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so, I should add the comment extracted from LoRaPacket and add it at the last part of the syslog log packet?
I believe this is for the other topic ;-)

> so, I should add the comment extracted from LoRaPacket and add it at the last part of the syslog log packet? I believe this is for the other topic ;-) <!-- github-comment-id:2081494598 -->
adam commented 2026-10-05 05:32:40 +02:00
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@ON3JT can you try "syslog-mod" branch which should deliver comment of compressed (base91) and not compressed gps data on Rx packets

let me know how it goes

@ON3JT can you try "syslog-mod" branch which should deliver comment of compressed (base91) and not compressed gps data on Rx packets let me know how it goes <!-- github-comment-id:2119600922 -->
adam commented 2026-10-05 05:32:41 +02:00
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this seems to bee solved, so closing

this seems to bee solved, so closing <!-- github-comment-id:2174760439 -->
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Reference: adam/LoRa_APRS_iGate#58