Hi all,
I've implemented an AX.25 connected mode 'convergence layer' for the
Delay Tolerant Networking reference implementation (see dtnrg.org).
I'd like to submit it upstream soon, but I've observed some quirks in
testing that I'd like to understand better.
My implementation of the AX.25 Connected mode convergence layer
(ax25cm-CL) uses Linux support for AX.25 sockets and has been mostly
tested using a PK-232 (KISS mode) with a hard-wired loop-back cable,
although a little OTA testing has been done elsewhere with no
detrimental reports.
The quirk I'm observing has symptoms which prevent subsequent
communications between two SSIDs on the same host. The problem shows
up in netstat output as a socket in the listening state, but unusually
it has call/SSID in both source and dest fields, which strikes me as
being an anomaly. This entry in netstat output is in addition to the
original listening socket, from which the connection threads with
their own connected sockets are spawned.
When further attempts are made to set up a connection between the two
call/SSIDs, an "Address already in use" error occurs. Note please that
the error message is from recollection, not verbatim, as I don't have
access to the TNC at the moment.
Can anyone shed any light on this behaviour. I've noticed similar
error messages when dabbling with Bluetooth connections under
circumstances where I already have an rfcomm connection established
and erroneously try to bring up another identical one. This makes me
wonder if there is a resource leak for an AX.25 socket in my ax25cm-
CL implementation, when a connection 'closes' due to errors. In my
loopback testing, I get quite a few errors, which seem to be mitigated
somewhat by adjustment of the timing parameters.
FYI, the test system with the PK-232 is running Ubuntu 7.10.
Any help would be appreciated.
Cheers,
Darren, G0HWW
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