[aprssig] "no sym yet" icon + compressed packets?
hessu at hes.iki.fi
Sat Feb 15 02:40:18 EST 2014
On Sat, 15 Feb 2014, Stephen H. Smith wrote:
> On 2/14/2014 11:07 PM, Paul Bramscher wrote:
>> Forgot to add -- my station, and the others that get 'no sym yet', seem
>> to all be passing compressed-format packets. So maybe that's a factor
>> also. It's unclear to me how to turn off compression on my D710, as an
>> experiment, so see if that's his issue.
> 3) Mic-E format is notorious for getting mangled by some out-dated igate
> software that attempts to convert it to plain-text before passing it to the
> APRS-Internet System. (Rather than just passing the Mic-E packet as-is to
> the APRS-IS.)
> Are the "raw packet" displays on findu or APRS.fi showing the typical Mic-E
> gibberish, or are you seeing something that looks like plain-text lat/long
> values in your igated packets?
The mic-e packets seem to be getting mangled. Some packets have
/- is correct for the house.
Some packets with the 0x1C byte missing (mangled by broken igate) get
which is quite invalid indeed.
The aprs.fi code that translates that to text ("House (HF antenna)") seems
to be a bit buggy, it probably should say something like "invalid symbol
table or overlay code".
The APRS packet code at this end also needs a bit of improvement in the
handling of mangled mic-e packets, I think it should be able to get the
symbol table right, since it is present in the remaining packet data. I'll
look into it a bit later.
The K0GDI-6 igate should also be fixed to not eat bytes out from mic-e
- Hessu, of aprs.fi, now in London
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