AX25 Modem Issue

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KM4ACK

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Aug 29, 2022, 7:20:13 AMAug 29
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This has been reported by a couple of users on my forum. I confirmed I could replicate it here. Start the ax25 modem and make a connection. All is well. Attempt to make a second connection produces the error [Unable to establish connection to remote: address already in use]. (see below). If I shutdown the ax25 modem and restart, I am able to make one connection again and then get the error when trying a second connection.

pi@field-pi:~ $ pat connect ax25:///WC4EOC-8?freq=145050
2022/08/29 06:15:48 my-rig ready. Dial frequency is 145.050.00 MHz.
2022/08/29 06:15:48 QSY ax25: 145050
2022/08/29 06:15:51 Connecting to WC4EOC-8 (ax25)...
2022/08/29 06:15:53 Connected to WC4EOC-8 (AX.25)
[WL2K-5.0-B2FWIHJM$]
;PQ: 04657260
CMS via WC4EOC >
>FF
FQ
2022/08/29 06:15:59 Disconnected.
2022/08/29 06:16:00 QSX ax25: 145050.000
pi@field-pi:~ $ pat connect ax25:///WC4EOC-8?freq=145050
2022/08/29 06:16:10 my-rig ready. Dial frequency is 145.050.00 MHz.
2022/08/29 06:16:10 QSY ax25: 145050
2022/08/29 06:16:13 Connecting to WC4EOC-8 (ax25)...
2022/08/29 06:16:13 Unable to establish connection to remote: address already in use
2022/08/29 06:16:14 QSX ax25: 145050.000
pi@field-pi:~ $

John Spoonhower

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Aug 29, 2022, 9:48:17 AMAug 29
to KM4ACK, pat-users
I would add that the pat-gensio (gax25) version does not have this problem.
John, NX2I

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Masen KF7HVM

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Sep 4, 2022, 11:31:53 AMSep 4
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This is likely a linux kernel ax25 stack issue. It was reported in pat as #352 with a comment linking to the upstream kernel patch that should fix the bug.

I haven't had a chance to test the fix yet, but it did merge. I looked at the FAQ on netdev merge cycles and it's more complicated than I'm willing to unpack this morning, so I don't know exactly when it would be coming to a distribution near you.

Certainly if you're building your own kernels, it would be trivial to just include the patch as merged.

-Masen KF7HVM

KM4ACK

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Sep 4, 2022, 12:49:26 PMSep 4
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Thanks for the heads up Masen. Wasn't aware that it was already documented.

73, de KM4ACK
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