Reply ACKs vs REJ Acks not properly working

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Wayne Spivak

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Sep 18, 2025, 4:47:06 PMSep 18
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APRS.fi doesn't seem to ALWAYS send ACKs upon reciept.

I see the message on my phone, but on my TNC or LOG I don't see the ACK.

I have a re-designed version of APRSBOT, but with a Store & Forward component that needs to receive the ACK to show that a message in the Store has been received.

If I don't get it, it stays in the Store db and gets retried either on the next time the callsign-ssid is heard or every 6 hours until either a ACK is received or the number attempts is greater than "n" or the message times-out "x" is reached.  "n" and "x" are configurable.

Is there a known issue?

Wayne Spivak

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Sep 29, 2025, 8:40:30 AMSep 29
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Anyone have an answer, a remedy, something??

Heikki Hannikainen

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Sep 29, 2025, 10:21:06 AMSep 29
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Hi,
Not a known issue. Can you point me to an example of raw packets
(callsign-SSID, UTC timestamp, link to https://aprs.fi/?c=raw showing the
packets)?

- Hessu

Wayne Spivak

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Sep 30, 2025, 1:22:42 AMSep 30
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Thank you Hessu,

Just for clarification, I am using on my iPhone the APRS.fi app.  Let us focus just on today, 9/29/2025.

I am providing the log of messages sent by my Bot (ERLI APRS NET Log).
The Raw packets from KC2NJV-4 (the bot, which go through KC2NJV-10, my TNC) and direct you to the highlighted entries.
Also I have the Raw Packets from KC2NJV-3.
Below is my current (as of writing this email) stored messages for KC2NJV-3
image.png
Lastly "iphone log.png" png file showing messages received from KC2NJV-4 on my iPhone.

Let's zero in on the 06:05 entries.  At that time, as I previously explained, I force all messages not sent to be resent, regardless if my bot heard anything from the list stations, because that is not 100% a reliable parameter.

There are no ACKs showing for 9/29/2025.

Obviously, one would ask why the third text message wasn't received by the iPhone, or the 01:35 message (which was received at 06:05, but not ACK'd).

Is the issue clear?

Thank you.




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Regards,


Wayne Spivak
+1-516-221-3306

ERLI APRS Net Log.pdf
Raw packets of KC2NJV-3 – aprs.fi – live APRS map.pdf
iphone log.png
Raw packets of KC2NJV-4 – aprs.fi – live APRS map.pdf

Heikki Hannikainen

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Sep 30, 2025, 1:33:18 AMSep 30
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Hi,

One reason might be that an iPhone app does not get to execute when a
notification is received from the backend. The notification will be shown
to the user, and the sound is played, but the app does not wake up and
run, until the user opens the message or otherwise goes to the app.

Only after that the app executes and may send an ACK. The app does not
send out acks for messages older than 2 hours, to avoid sending out a
flood of acks when an app instance is launched on a new device, or
otherwise a second device after a while.

Did you have the app open when testing? And push notifications allowed for
aprs.fi?


On Mon, 29 Sep 2025, Wayne Spivak wrote:

> Thank you Hessu,
>
> Just for clarification, I am using on my iPhone the APRS.fi app.  Let us focus just on today, 9/29/2025.
>
> I am providing the log of messages sent by my Bot (ERLI APRS NET Log).
> The Raw packets from KC2NJV-4 (the bot, which go through KC2NJV-10, my TNC) and direct you to the highlighted entries.
> Also I have the Raw Packets from KC2NJV-3.
> Below is my current (as of writing this email) stored messages for KC2NJV-3
> You received this message because you are subscribed to the Google Groups "aprs.fi" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to aprsfi+un...@googlegroups.com.
> To view this discussion visit
> https://groups.google.com/d/msgid/aprsfi/CA%2B42cYJpgknTB6rkfgrt%2BqwBcR5%2B6EexpW_gVPJiCWAVR_9nnw%40mail.gmail.com.
>
>

- Hessu

Wayne Spivak

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Sep 30, 2025, 4:51:12 PMSep 30
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App is open (although in background).

Disable display sleep is off (what ever that does), otherwise everything is basically on that may affect ACKs.

" Pushed" notifications are on, and I get them both on the phone and the iWatch.

Thx

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