Re: Trying to join the hamradio team
On 08.11.21 at 16:45 wrote David Ranch:
Direwolf can be directly connected to the Linux AX.25 stack either via
it's PTS pseudo-serial interface or it's TCP-KISS interface and socat.
Yes, thank you, I know all these facts and I have successfully tried
them out. The kissattach program, however, is needed to connect the
ptty. Unfortunately kissattach is not very systemd friendly because it
does not store its pid into a file, so it can be controlled. Yes this
could be fixed by fixing kissattach, and yes the issue can be worked
around. "soundmodem" on the other hand does not need kissatach because
it uses the kernel mkiss interface.
Next up, yes, soundmodem does offer the ability to send AX.25 packets
over at least one alternative mode but in my experience, that one mode
didn't perform very well and never gained any adoption.
Perhaps we do not understand the same thing when speaking about modes?
What I mean is that you can set up, say 1200Bd and 9600Bd on the same
radio link at the same time (well almost), i.e. you can work two
different stations each connected at its speed of the same radio link.
To my knowledge this is a feature that is planned for direwolf, but not
available today, correct?
Direwolf offers
multiple modes (AFSK, FSK, PSK, QPSK, IL2P, etc) as well as FX.25
support be it for speed, robustness, etc.
Yes this a impressive.
Finally, if you run various
packet decode tests, you'll see that Thomas Sailers's soundmodem gets
about a 60-65% decode rate where as Direwolf, UZ7HO's soundmodem, and
even some hardware TNCs get in upwards of 95%:
https://raw.githubusercontent.com/wb2osz/direwolf/master/doc/WA8LMF-TNC-Test-CD-Results.pdf
Thank you for the pointer, I will look into this later when I have some
time.
73 Roland, oe1rsa
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_ _ | Roland Schwarz
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