[OZAPRS] OZAPRS Digest, Vol 106, Issue 1

[David Murphy]

Thanks Damien.
On Fri, Nov 2, 2018 at 12:10 PM <ozaprs-request at aprs.net.au> wrote:
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> Today's Topics:
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>    1. Do RX only igates break APRS messaging? (David Murphy)
>    2. Re: Do RX only igates break APRS messaging? (Damien Gardner)
>
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 1 Nov 2018 19:39:05 +1100
> From: David Murphy <david.k.murphy at gmail.com>
> To: ozaprs at aprs.net.au
> Subject: [OZAPRS] Do RX only igates break APRS messaging?
> Message-ID:
>         <CAPDnM1VMZ=EZHQBbv5dh8RGHDNUtqSTwE6L9s92nAH9RK3XE-Q at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Hi Team,
>
> I am new to APRS and trying to get my head around it for SAR and WICEN
> use. Messaging seems like a great function, but obviously needs
> bi-directional simplex radio coverage between stations on APRS or
> access to an i-gate that has TX and RX functions. So my questions is
> do RX only i-gates kill messaging? From what I have read the APRS
> servers will route a message back to the i-gate that heard the station
> first, is that right? Therefore the message doesn't get sent?
>
> Thanks,
> Dave
>
> VK2XDA
>
>
> ------------------------------
>
> Message: 2
> Date: Fri, 2 Nov 2018 06:48:42 +1100
> From: Damien Gardner <vk2tdg at gmail.com>
> To: Australian APRS Users <ozaprs at aprs.net.au>
> Subject: Re: [OZAPRS] Do RX only igates break APRS messaging?
> Message-ID:
>         <CAOL3_0T7fs4jEHztqa_-iqpbapyZZO5jHE3sMpaM1KZZnLtLwA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hey Dave,
>
> The 'APRS Servers' don't route anything, unless something's changed in one
> of the newer daemons.  They're just relaying a simple text based string to
> all connected stations (with some caveats around filters based on the TCP
> port stations are connected to), for each packet on the network.  They're
> not really even aware that they're handling an AX-25 payload (As evidenced
> by all the malformatted D-star crap being relayed with invalid SSID's).
> It's the i-gates and digipeaters that are actually doing the routing.
>
> If you send a message from one station to another, and it ends up on the
> internet stream, it will only end up back out on RF, if it hits an i-gate
> that has HEARD the destination call, and that i-gate has TX capability.  If
> the destination station has been heard by multiple TX-capable i-gates, then
> the message will be relayed by multiple i-gates. Just like it might travel
> multiple paths from the i-gate to the destination, so duplicate handling
> kicks in on the receiver anyway :) (DUP! on my D7 :) )
>
> Cheers,
>
> DG
>
> On Thu, 1 Nov 2018 at 19:39, David Murphy <david.k.murphy at gmail.com> wrote:
>
> > Hi Team,
> >
> > I am new to APRS and trying to get my head around it for SAR and WICEN
> > use. Messaging seems like a great function, but obviously needs
> > bi-directional simplex radio coverage between stations on APRS or
> > access to an i-gate that has TX and RX functions. So my questions is
> > do RX only i-gates kill messaging? From what I have read the APRS
> > servers will route a message back to the i-gate that heard the station
> > first, is that right? Therefore the message doesn't get sent?
> >
> > Thanks,
> > Dave
> >
> > VK2XDA
> > _______________________________________________
> > OZAPRS mailing list
> > OZAPRS at aprs.net.au
> > http://lists.aprs.net.au/mailman/listinfo/ozaprs
> >
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> End of OZAPRS Digest, Vol 106, Issue 1
> **************************************