[aprssig] KPC-3+ KISS mode delayed packet issue?

Mark Cheavens mcheavens at usa.net
Fri Dec 19 12:17:39 CST 2008

This has been seen before on KPC-3+'s. It is not a time delay, but a 
buffer issue. First in First out.

It is annoying, I use only TNC-2's with KISS roms in them for 
computer connected TNC's.

Mark Cheavens
At 11:33 AM 12/19/2008, you wrote:
>I seem to recall reading here some time back that there was some bug in
>the KPC-3+ in KISS mode that could cause it to screw up and hold packets
>for some reason.
>I'm seeing some very strange delayed packets in my local environment, and
>since I'm running a KPC-3+ in KISS mode I'm wondering if it's my fault.
>What it seems to be is that packets I am transmitting seem to be getting
>digipeated 10 minutes or more later.  My logs show my transmitted packet
>going out to the TNC, then sometime soon after a digipeat of a much older
>packet coming back.  My current guess is that my packets are being held at my
>TNC until my next transmission or something (this rings a bell about the KPC
>holding until a buffer is full or something like that).  I want to fix it if
>that's what's going on.
>Could someone refresh my memory about:
>   1) what the actual issue is that can cause KPC-3+ KISS-mode TNCs to hold
>      off transmitting packets for as much as 10 minutes, if there is in fact
>      such an issue
>   2) The correct way to fix it (is it as simple as power-cycling the TNC?)
>   3) The best way to avoid the problem in the first place, if it is in fact
>      my system that's causing the delay.
>Tom Russo    KM5VY   SAR502   DM64ux          http://www.swcp.com/~russo/
>Tijeras, NM  QRPL#1592 K2#398  SOC#236        http://kevan.org/brain.cgi?DDTNM
>   In some cultures what I do would be considered normal.
>                                   -- Ineffective daily affirmation
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>aprssig at tapr.org

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