Hi folks,
I'm working on a Golang binding for the WSJT-X UDP interface as described
in NetworkMessage.hpp. It's starting pretty well (
https://github.com/xylo04/wsjtx-go), but I'm running into troubles parsing
the Status messages in particular. I'm able to parse through many blocks of
bytes, but at some point I start running into an unexpected block of 0x00
and 0xff. Then, after a handful of those bytes, it resumes with the last
field.
Is this maybe some feature of QDataStream that will abbreviate several
adjacent fields with default values? I can't immediately find documentation
about it. (I did find a post from Thiago Macieira ranting that QDataStream
itself was never meant to be decoded by anything other than QDataStream and
is thus not extensively documented.)
Here are a couple of example packets:
With DxCall and DxGrid:
0 1 2 3 4 5 6 7 8 9 a b c d e f
00000000 ad bc cb da 00 00 00 02 00 00 00 01 00 00 00 06
|................|
00000010 57 53 4a 54 2d 58 00 00 00 00 00 d6 c0 90 00 00
|WSJT-X..........|
00000020 00 03 46 54 38 00 00 00 04 57 30 59 4b 00 00 00
|..FT8....W0YK...|
00000030 03 2d 31 38 00 00 00 03 46 54 38 00 00 00 00 00
|.-18....FT8.....|
00000040 02 74 00 00 06 d6 00 00 00 05 4b 30 53 57 45 00
|.t........K0SWE.|
00000050 00 00 06 44 4d 37 39 4c 56 00 00 00 04 43 4d 39
|...DM79LV....CM9|
00000060 37 00 ff ff ff ff 00 00 ff ff ff ff ff ff ff ff
|7...............|
00000070 00 00 00 07 44 65 66 61 75 6c 74 |....Default
|
Magic number 00-03
Schema number 04-07
* Status Out 1 quint32 08-0b
* Id (unique key) utf8 0c-15
* Dial Frequency (Hz) quint64 16-1d
* Mode utf8 1e-24
* DX call utf8 25-2c
* Report utf8 2d-33
* Tx Mode utf8 34-3a
* Tx Enabled bool 3b
* Transmitting bool 3c
* Decoding bool 3d
* Rx DF quint32 3e-41
* Tx DF quint32 42-45
* DE call utf8 46-4e
* DE grid utf8 4f-58
* DX grid utf8 59-60
* Tx Watchdog bool 61?
* Sub-mode utf8 ???
* Fast mode bool ???
* Special Operation Mode quint8 ???
* Frequency Tolerance quint32 ???
* T/R Period quint32 ???
* Configuration Name utf8 70-7a
Without DxCall or DxGrid (note, TxWatchdog is not here, which makes me
question it above):
0 1 2 3 4 5 6 7 8 9 a b c d e f
00000000 ad bc cb da 00 00 00 02 00 00 00 01 00 00 00 06
|................|
00000010 57 53 4a 54 2d 58 00 00 00 00 00 d6 c0 90 00 00
|WSJT-X..........|
00000020 00 03 46 54 38 00 00 00 00 00 00 00 03 2d 31 38
|..FT8........-18|
00000030 00 00 00 03 46 54 38 00 00 00 00 00 02 74 00 00
|....FT8......t..|
00000040 06 d6 00 00 00 05 4b 30 53 57 45 00 00 00 06 44
|......K0SWE....D|
00000050 4d 37 39 4c 56 ff ff ff ff 00 ff ff ff ff 00 00
|M79LV...........|
00000060 ff ff ff ff ff ff ff ff 00 00 00 07 44 65 66 61
|............Defa|
00000070 75 6c 74 |ult
|
Magic number 00-03
Schema number 04-07
* Status Out 1 quint32 08-0b
* Id (unique key) utf8 0c-15
* Dial Frequency (Hz) quint64 16-1d
* Mode utf8 1e-24
* DX call utf8 25-28
* Report utf8 29-2f
* Tx Mode utf8 30-36
* Tx Enabled bool 37
* Transmitting bool 38
* Decoding bool 39
* Rx DF quint32 3a-3d
* Tx DF quint32 3e-41
* DE call utf8 42-4a
* DE grid utf8 4b-54
* DX grid utf8 ???
* Tx Watchdog bool ???
* Sub-mode utf8 ???
* Fast mode bool ???
* Special Operation Mode quint8 ???
* Frequency Tolerance quint32 ???
* T/R Period quint32 ???
* Configuration Name utf8 68-72
Any pointers are appreciated!
73, Chris, K0SWE
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