I think this is a reasonable request. It is correct that Pat will bind to -0 by default, but it would be great if users could set mycall: N0CALL and still be able to specify an arbitrary SSID for the AX.25 listener.
I believe it's a relatively easy to extent the ax25 config section with an optional SSID int value, and then pass that to wl2k-go/transport/ax25's listener.
If someone can create a new issue on github for this, I would very much appreciate it :)
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73 de LA5NTA