NEW comms/readsb

Hi,

cat pkg/DESCR
Readsb is a Mode-S/ADSB/TIS decoder for RTLSDR, HackRF, Modes-Beast and
GNS5894 devices.

Jason pointed me to readsb, kind of the grandchild of the dump1090 we have
in ports.
Took a bit to get it to build on OpenBSD, but overall I have the feeling it
catches more planes than dump1090. It won't replace dump1090 at least for
the time being, as it doesn't feature the built-in webinterface. Output of
readsb can be forwarded via network to dump1090 to view planes on the map.

Works like a charm with my RTL-SDR v3 blog, but quite lousy plane detection
with my HackRF Pro. YMMV.

test reports and feedback etc. welcome.

or even OK to import?

cheers,
Sebastian
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