Re: debugging KISS basics

[Ray Wells <vk2tv@exemail.com.au>]

Pidoux wrote:
> Chris,
>
> When TNC is in KISS mode you cannot issue any more command to it.
> Every data received are transparently transmitted (except the escape 
> sequence for putting it back into TERMinal mode.)
> Thus, you must set the TNC parameters (like the serial port speed, 
> MYCALL, dual port mode if TNC3, and adjust different audio TX levels 
> for once) before putting the TNC in kiss mode.
> In addition, once AX25 driver is loaded, you cannot converse with TNC 
> using your favorite Linux terminal communication program.
> My option is to boot Linux system without AX25 drivers, configure TNC 
> parameters, verify that you can listen to AX25 traffic and connect to 
> a local AX25 station using 1200 or 9600 baud port. Then, when you 
> estimate your TNC is doing well, send it the escape sequence command 
> to turn it into KISS mode.
> You can leave it in KISS mode forever.
> After that you are ready to load AX25 and mkiss drivers and run AX25 
> applications.
> Listen utility will help you verify the TNC can pass through AX25 
> traffic.
>
> 73 de Bernard, f6bvp
>
>
> Chris Kantarjiev a écrit :
>>>
>>> Wade through this document http://rose.fpac.free.fr/MINI-HOWTO/
>>
>> Thanks, Ray - that was very useful for learning about config
>> and startup.
>>
>> I'm still trying to figure out how to debug the fact that
>> my basic KISS commands won't cause the TNC to do anything...
>>
>> 73 de chris K6DBG
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>
>
>
Bernard,

You didn't mention kissparms (man 8), the description of which says ...
"Kissparms is used to dynamically configure KISS TNCs that have been set 
up for AX25 use by kissattach. This program uses the packet interface to 
allow it to communicate with the KISS TNC without interrupting the AX25 
data stream. Therefore the KISS parameters may be set at any time during 
the operation of the AX25 port.

Chris, if your TNC is TNC2 compatible you might consider a KISS only 
EPROM. Then you know it's always in KISS. Also, the KISS implementation 
in a native mode TNC2 EPROM has terrible timing issues (not sending data 
to the radio, and then sending over the top of a received station were 
two significant issues I found. The KISS only unit doesn't have these 
problems.


Ray vk2tv
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