[aprssig] aprs.fi duplicate packet checking

Randy Love rlove31 at gmail.com
Wed May 10 10:13:29 CDT 2017


Actually, if the client Fred is using is APRS message spec compliant, ALL 3
will receive the message, but only the one with the specific SSID that you
direct the message to will attempt to ACK the message.

So, if you're specifically looking for an ACK from the specific device,
then yes, you would have to send the message to all SSID's for all devices.
Otherwise, no, you do not have to send different messages packets each
individual device.

Randy
WF5X


On Wed, May 10, 2017 at 9:58 AM, Lynn W. Deffenbaugh (Mr) <
ldeffenb at homeside.to> wrote:

>
> The -SSID is ignored on the AX.25 DESTINATION callsign.  This has nothing
> to do with the addressee of an APRS message as that callsign-SSID is
> carried in the AX.25 payload.
>
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
>
> On 5/10/2017 9:37 AM, tapr at noseynick.com wrote:
>
>> Just spotted one detail:
>>
>> Packets are checked based [...] on [...] destination callsign (SSID
>>> ignored)
>>>
>> SSID *IGNORED*? Interesting! So if I want to get a message to Fred, and
>> I try sending to his home -1 and his car -2 and his phone -4, I'd better
>> send DIFFERENT messages, or wait >30sec? OK!
>>
>> Nick VA3NNW
>>
>>
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