[aprssig] APRS Message Callsign SPEC- Ambiguity
spam8mybrain at yahoo.com
Tue Apr 26 14:35:51 EDT 2016
One interesting point here is that RF stations wouldn't have to ack messages from this mixed-case service; the mixed-case service will have to ack messages from the RF ground station. So that's not an issue.
The issue here is whether any given ground client can send to a mixed-case addressee.
Andrew, KA2DDO author of YAAC
-------- Original message --------
From: "Lynn W. Deffenbaugh (Mr) via aprssig" <aprssig at tapr.org>
Date: 04/25/2016 9:56 PM (GMT-05:00)
To: TAPR APRS Mailing List <aprssig at tapr.org>
Subject: Re: [aprssig] APRS Message Callsign SPEC- Ambiguity
Yaesu APRS radios will not ack a
message if it comes from an -SSID that is not -0 (suppressed)
through -15 even though the APRS protocol for messages is always
in the payload portion for 3rd party packets gated from the
APRS-IS to RF with the ack coming back.
APRSISCE/32 upcases APRS message targets. At least I think it
does but I didn't check the source code just now.
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and
On 4/25/2016 5:07 PM, Robert Bruninga via aprssig wrote:
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There is an unintended ambiguity in the
APRS SPEC regarding the addressee in the APRS MESSAGE format.
It was intended that the TOCALL of any
transmitted message could be sent to ANY 9 character callsign
field and this included mixed-case. Although TNC’s have
historically forced callsigns to UPEPRCASE only, this is only
a limitation of TNC’s and was not intended to be a limitation
STATION names, OBJECT names, ITEM names
were intended to be a general 9 character mixed case field in
APRS padded to 9 with spaces.
We just noticed that some radios do not
allow sending an APRS message to a mixed case address.
Unfortunately, the QIKCOM-2 satellite which
does DTMF-to-Voice and APRS-to-voice has a special message
address of “QIKCOMsay” for all messages it is expected to
speak. So some people will not be able to exercise this
text-to-voice messaging capability.
I wont make this mistake in any future
satellite, but we are stuck with it.
SO, we might ought-to-identify all APRS
radios and APRS clients that have this uppercase-only
restriction on MESSAGE Callsigns.
I can say the Kenwoods have it. Others?
and specifically, see:
aprssig mailing list
aprssig at tapr.org
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