[aprssig] Is floating point telemetry allowed in APRS?
hessu at hes.iki.fi
Thu Mar 28 01:11:39 CDT 2013
On Wed, 27 Mar 2013, Lynn W. Deffenbaugh (Mr) wrote:
> Note also that the javAPRSSrvr t/t (type telemetry) filter will not pass any
> out-of-spec telemetry packets like these with floating point values or any
> that exceed 255.
To be precise, javAPRSSrvr 4.0 does not pass out-of-spec telemetry packets
to filtered-port clients which have a t/t filter set. 3.15 is not so
strict. Both do pass these packets to other servers and full-feed clients.
It's all good and OK if clients do not parse out-of-spec packets, but if
some client actually *crashes* when seeing such a packet, it's a problem
in that client software. Corrupted packets happen all the time, it's not
OK to crash when a client sees something that it didn't quite expect.
That's called a security vulnerability in other circles.
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