[aprssig] Item-in-msg (was solar impulse tracking)

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Thu May 9 07:19:54 CDT 2013


Note: If you update your APRS client to interpret and display the 
Item-in-msg format, please update the application identifier and let me 
know about it so I can update APRSISCE/32's QRU auto-responder to send 
these to your appropriately-versioned client application users.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32

On 5/6/2013 9:12 PM, Andrew Elwell wrote:
> Hi Bob et al,
>
>> NOTE!  We could do this centrally from one location if IGATE clients
>> implemented the ITEM-IN-MSG protocol.  This next phase of APRS has been
>> proposed in APRS1.2 for over 5 years now.  But I am not sure if any clients
>> have implemented it.  We need to get moving on this.  ITEM-in-MSG is
>> fundamental to a number of APRS initiatives to improve the ability to convey
>> info to others in real time.
> I've just looked at the spec for both item-in-msg.txt and msg-obj.txt
> and I have a few questions:
>
> is the item-in-msg *always* directed to an individual callsign? ie,
> for the solar impulse tracking there's no way to make a broadcast
> style announcement of (location of plane + radius 100km)?
>
> Secondly the msg-obj seems to be tied to the position of the sender -
> again, you'd have to fake your position to be able to do the solar
> impulse stuff above.
>
> Finally the mention of the KILL, QRZ and [Generic] OBJECT servers in
> msg-obj -- are they connected via aprs-is to provide global coverage
> or are they expected to be RF only (wondering how you'd prevent faking
> of a KILL to remove an object, or how a KILL server would communicate
> with the PLANE_OBJECT server to say that solar impulse had been
> removed as its now completed its journey?)
>
> Andrew
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