[aprssig] APRS Message Callsign SPEC- Ambiguity

spam8mybrain spam8mybrain at yahoo.com
Tue Apr 26 13:35:51 CDT 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
      Win32

      

      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
          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
      
      

      
      

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