[aprssig] Why do stations send telemetry parameter messages to themselves?

[John Gorkos]

I'm back into the deep, ugly guts of parsing the full APRS-IS stream, 
and I keep seeing messages like this:


EL-OK1BY>RXTLM-1,TCPIP,qAR,OK1BY::EL-OK1BY:UNIT.RX Erlang,TX 
Erlang,RXcount/10m,TXcount/10m,none1,STxxxxxx,logic
ER-F5ZVB>RXTLM-1,TCPIP,qAR,F5ZVB::ER-F5ZVB :UNIT.RX Erlang,TX 
Erlang,RXcount/10m,TXcount/10m,none1,STxxxxxx,logic
KI0AU-1>APMI06,TCPIP*,qAC,T2BC::KI0AU-1 
:UNIT.C,Pkt,Pkt,Volts,Volts,N1,N2,N3,N4,N1,N2,N3,N4
GM7AFE>APMI01,TCPIP*,qAS,MB7UZL::GM7AFE 
:UNIT.Pkt,Pkt,Pcnt,Volts,Volts,Off,On,On,On,Hi,Hi,Hi,Hi

Why are stations wrapping telemetry parameter messages in APRS Messages 
and then sending them to themselves?  At least they're not asking for 
acknowledgements.  Can anyone explain this behavior and what it's 
intended to do, versus just using a :T telemetry message, per spec?

While we're at it, what does the RXTLM-1 tocall tell me?  Clearly 
something to do with Receive Telemetry (i.e. erlang values, etc).


Thanks de AB0OO
John Gorkos