[aprssig] station capability flags
oh2kku at iki.fi
Thu Mar 1 13:00:21 CST 2007
Jason Winningham wrote:
> There was some discussion in the past few days about not knowing which
> stations were acting as Igates. One thing that has always seemed
> missing in the APRS protocol is a way to indicate station attributes.
What about the '<' packet type, defined on page 77 the APRS spec. Isn't
that exactly what you are looking for? The spec wording says it is only
to be used as a response to queries, but I've seen applications that
send those packets periodically, without being queried for. There should
be a list of station capabilities maintained separately from the spec,
so that new "flags" can be easily defined, but I'm not sure if there is
such a list.
> In the absence of a dedicated field added to the protocol, it seems to
> me we could get a very limited set of flags by using the TOCALL SSID
> bits. A quick scan of my tnc log file didn't show any TOCALL addresses
> using an SSID other than 0.
That would be very limited indeed, just four independent bits. The mic-e
flooding system already defines a use for the destination callsign SSID,
but I haven't seen it implemented anywhere. I'd rather see a text/ascii
flag of some sorts used in the body of a packet, maybe '<', '>' or in
the comment part of a regular packet.
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