[aprssig] Definition of IGate status messages? ("Station Capabilities")
Lynn W. Deffenbaugh (Mr)
ldeffenb at homeside.to
Tue Jun 28 08:26:44 CDT 2016
On 6/28/2016 9:00 AM, John Langner WB2OSZ via aprssig wrote:
> This leaves many questions. Does "number of messages transmitted" mean only
> the APRS "Message" (data type indicator ":") or does it mean any type of
> APRS packet?
For APRSISCE/32 I count only the APRS Message packets for MSG_CNT. And
only those gated from the APRS-IS to RF for local stations since it is
afterall an IGate status packet.
> What are "local" stations? Anything heard over the radio or
> only those we hear directly without going thru a digipeater?
For APRSISCE/32, "Local" is defined as those stations to which messages
would be gated if any are received from the APRS-IS. This currently
means unique stations heard within the past 30 minutes with at most two
used path hops.
> Do we count
> stations heard in the last hour? Last 24 hours? A year ago?
This was completely unspecified as far as I could tell, so APRSISCE/32
simply counts them per activation. If the IGate is restarted, the
counts start over at zero.
> What are DIR_CNT, RF_CNT, RFPORT_ID, ...?
I added DIR_CNT and RF_CNT with comma delimiters to APRSISCE/32's IGate
status. DIR_CNT is the count of unique stations received on RF in the
past 30 minutes with no used hops. RF_CNT is the total count of unique
stations received on RF in the past 30 minutes.
> Are the counts since the system started up or are they for some interval?
APRSISCE/32 starts counting at zero for each execution of the program.
Of course the DIR/LOC/RF_CNTs are instantaneous at the time of transmission.
> Is any of this defined anywhere? What other statistics are commonly used?
> What new statistics would be useful?
Not that I know of!
I extended the spec while adhering to the key=value,key=value format.
APRSISCE/32 may also include a PKT_CNT (count of non-message APRS-IS
packets gated to RF) and possibly a Receive-Only indication if
transmitting is disabled on the IGate's RF port.
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
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