[aprssig] APRS-IS: frames bypassing server filter

[Mark Cheavens]

While not an IS author, the IS servers need to then only use qAO gated 
packets as a source of last resort.

Currently the message routing is to the last known source.
- Unless I am wrong and ALL I-Gates will try and send a message?

As an example:
An APRS user is in range of "Harris". That packet is gated typically by 
a few different I-Gates:
1. DURNGO (Mountain top I-Gate/Digi with low latency fiber - Proper two 
way, 10,500ft)
2. KC5EVE-10 (My house in the valley 9,000ft also with low latency 
fiber- Proper two way)
3. K5LRY-10  (Recieve ONLY I-Gate) - I don't know that HAM - It does 
connect with "qAO"

https://aprs.fi/?c=raw&call=HARRIS

We need to make sure messaging works to the closest available two way 
I-Gate.
- If you look at other digi's in the "area" (Four Corners) you will see 
that the above three I-Gates gate most of the packets.
EGLPASS, LAMOSC, HARRIS, N5WNA-1

Mark
KC5EVE

On 7/15/2020 9:27 AM, Lynn W Deffenbaugh (Mr) wrote:
> Good catch John!
>
> So, if the APRS-IS server would look for the qAO on incoming packets 
> on an IGate-capable port, they could skip the adding of the packet 
> source to whatever they are using to forward future packets out that 
> connection.  I like the idea.  I requires NO changes to the protocol, 
> allows the IGate operator (and the software) to indicate in a standard 
> fashion that it is receive-only, and the APRS-IS server can take 
> action on information that is already being passed.  And it doesn't 
> break if the IGate is connected to a non-supporting APRS-IS server 
> instance, they'll just continue to receive the packets that they 
> receive today.
>
> APRS-IS server authors, what do you think?
>
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
>
> On 7/15/2020 9:48 AM, John Langner WB2OSZ wrote:
>> There is already a way for IGate stations to identify themselves as 
>> two way
>> or receive only.
>>
>> >From  http://www.aprs-is.net/q.aspx
>>
>> qAR - Packet is placed on APRS-IS by an IGate from RF. The callSSID
>> following the qAR is the callSSID of the IGate.
>>
>>
>> qAO - (letter O) Packet is placed on APRS-IS by a receive-only IGate 
>> from
>> RF. The callSSID following the qAO is the callSSID of the IGate. Note 
>> that
>> receive-only IGates are discouraged on standard APRS frequencies. Please
>> consider a bidirectional IGate that only gates to RF messages for 
>> stations
>> heard directly.
>>
>>
>>
>>
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>
>
>
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