[Xastir-dev] aprs message acks

[John Williams]

Thanks for the info. Reading the reply ack spec now.

It's not in the printed aprs spec I have v1.0.1 which is why I asked the question.

I wonder if some of the additional "stuff" will make it into the spec. Perhaps I shouldn't go there.

I am surrounded by UI-View users which was the only other baseline to go by.
None of those stations added the trailing }.

>From the reply ack spec I can either ignore it or add code process the } .

Regards
John
VK5ZTY

I   

On 31 Mar 2004 at 20:21, Curt Mills wrote:

> On Thu, 1 Apr 2004, John Williams wrote:
> 
> > Xastir when it send an aprs message appends the message number to acknowledge as {22}.
> >
> > The {22 I understand, but is the trailing } part of the ack or just a character enclosing the
> > message number.
> 
> It is important.  It's part of the ack-ack message protocol that
> APRS+SA and Xastir use, perhaps others.
> 
> The idea is that you send the message number that you've last
> received from the other station, so that the other station marks it
> as ack'ed even if it missed getting your ack.  It makes 2-way
> messaging fly much faster, when both people are typing.
> 
> 
> > An addition being considered is the use of a continuation character '>' to let the server know
> > that the next message from the sending station will be another aprs message to be appended
> > to the email.
> >
> > I an looking at  using the message number to determine the sequence of received packets.
> >
> > So if the trailing } is just cosmetic, does it really have to be there.
> 
> It's not just cosmetic.
> 
> -- 
> Curt, WE7U.				archer at eskimo dot com
> http://www.eskimo.com/~archer
>   Lotto:  A tax on people who are bad at math. - unknown
> Windows:  Microsoft's tax on computer illiterates. - WE7U.
> The world DOES revolve around me:  I picked the coordinate system!"
> 
>