[Xastir] HOWTO: Transmit tactical callsign assignments to others

[Curt, WE7U]

I'm sending this to the list as well so that other people know how
to use this function.  I had forgotten myself but was prompted to go
look at the code again by a user question.

I just tested this between two local Xastir instances on the same
machine connected via Xastir's server ports.  Assigning the tactical
callsign via the Station Info dialog on either did NOT propagate the
tactical callsign over the interface.  Sending a message to
"TACTICAL" DID propagate it across to the other Xastir.  Sending a
message of "we7u-4=" to "TACTICAL" cancelled the assignment on both.

Note that this method should work between Xastir stations if the
Xastir code is newer than 8/12/2009.  APRS+SA stations also have
this capability and their tactical callsign assignments should
interoperate with Xastir stations.  --we7u

---------- Forwarded message ----------

Since I wrote it so long ago I had to go look at the source code to
figure out how to work it again.  It looks like the default is to
NOT send it across the air.  Starting at line 15788 of
xastir/src/db.c, it says this:

---------------------------------------------------------------------
// Assign tactical callsigns based on messages sent to "TACTICAL"
//
//  *) To set your own tactical callsign and send it to others,
//     send an APRS message to "TACTICAL" with your callsign in
//     the message text.
//
//  *) To send multiple tactical calls to others, send an APRS
//     message to "TACTICAL" and enter:
//     "CALL1=TAC1;CALL2=TAC2;CALL3=TAC3" in the message text.
//
//  '=' or ';' characters can not be in the TAC callsign.
---------------------------------------------------------------------

This means you can assign tactical calls locally, but they will NOT
be transmitted unless you follow the procedure listed above to
initiate a message to "TACTICAL" in the above specific format.  All
of the between-stations sending of tactical calls is done through
the message system.

-- 
Curt, WE7U.                         <http://www.eskimo.com/~archer>
    APRS:  Where it's at!                    <http://www.xastir.org>
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