[aprssig] APRS Message Callsign SPEC- Ambiguity
Lynn W. Deffenbaugh (Mr)
ldeffenb at homeside.to
Mon Apr 25 20:56:17 CDT 2016
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 Win32
On 4/25/2016 5:07 PM, Robert Bruninga via aprssig wrote:
> 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 of APRS.
> 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?
> See http://aprs.org/aprs11.html and specifically, see:
> See http://aprs.org/aprs11/aprs-names-and-spaces.txt
> Bob, WB4APR
> aprssig mailing list
> aprssig at tapr.org
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