[aprssig] APRS-IS Database :: Query for static dataset

Kenneth Finnegan kennethfinnegan2007 at gmail.com
Sun Jul 19 13:08:30 CDT 2015


Each APRS-IS maintains an internal table of packets it has seen in the last
30 seconds for dedup. After 30 seconds, the IS server throws them away.

--
Kenneth Finnegan
http://blog.thelifeofkenneth.com/

On Sun, Jul 19, 2015 at 10:58 AM, Nagi Punyamurthula <n0agi at n0agi.com>
wrote:

>  Thanks – that’s what I thought.
>
> What made me think of asking this question was given that the APRS-IS
> server checks for packet dups submissions, I was thinking, there had to be
> previous records stored somewhere to compare w/.
>
>
>
> So, that begs a question; how does the APRS-IS determine whether a record
> is dup vs not ? and what  does it compare the new incoming packet to.
>
>
>
>
>
>
>
> *From:* Kenneth Finnegan [mailto:kennethfinnegan2007 at gmail.com]
> *Sent:* Sunday, July 19, 2015 11:02 AM
> *To:* TAPR APRS Mailing List <aprssig at tapr.org>; Nagi Punyamurthula <
> n0agi at n0agi.com>
> *Cc:* mnaprs at googlegroups.com
> *Subject:* Re: [aprssig] APRS-IS Database :: Query for static dataset
>
>
>
> There is no such thing as the APRS IS database pool. It is just a firehose
> of packets and if you want to see past data you need to have saved it when
> it came through.
>
> Kenneth Finnegan
>
> On Jul 19, 2015 8:48 AM, "Nagi Punyamurthula via aprssig" <
> aprssig at tapr.org> wrote:
>
>  Hello all
>
> Is there a way to pull a static snapshot dataset from APRS-IS Database.
> That is, connect à get dataset (based on a few filters) à disconnect. The
> purpose of this is to get a historical snapshot of data from the APRS-IS
> Database pool.  Is this query exposed today in APRS-IS infrastructure; or
> does one need to implement our own repository logic?
>
>
>
> I have been able to pull realtime JIT data via establishing a TCP
> connection to the server pool on port 14580. So, I know we can do that.
> But, I was not sure if it is possible to pull static historical dataset and
> **whether if that static view was even kept in the APRS-IS database pool*
> *.
>
>
>
> Any pointers here from the APRS-IS gurus
>
>
>
> Thanks
>
> Nagi
>
>
>
>
>
> 73, N0AGI-Nagi
>
> [image: cid:image001.jpg at 01D08197.994BC970]
>
> http://N0AGI.com/
>
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>
>
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