Re: [Bluez-devel] l2cap connection problems

[Marcel Holtmann <marcel@holtmann.org>]

Hi Troy,

> I have written a client and server that need to be able to
> communicate over Bluetooth.  I am attempting to use L2CAP, but
> am not able to consistently connect to the server.  My
> application requires the server socket that accepts L2CAP
> connections to be non-blocking.  On the client side, I am
> using a non-blocking connect (connect with 2 second timeout).
>  However, in trying to debug the connection problem, I have
> tried using non-blocking sockets at both ends.  Even in this
> situation, my results were the same.  Sometimes the connection
> is accepted immediately (roughly half the time), the server
> begins streaming data to the client, and everything works
> great.  Just as frequently, the connection attempt times out
> at the client (when the client uses a blocking connect), or
> the connection succeeds after some number (potentially very
> many) of non-blocking connect attempts.  Occasionally the
> connection attempt appears as if it will never succeed.  I
> have attached a file containing hcidump output for 3 cases
> which are annotated in the file.  In all 3 cases a blocking
> accept is used at the server.  It seems as if the HCI layer
> events are identical regardless of whether or not the L2CAP
> layer accept (server) and connect (client) succeed.  Any
> thoughts as to what the problem might be?  For whatever it's
> worth, I am using D-Link DBT120 USB adapters.  Thanks in advance.

I can't really follow you what you are trying to achieve. May you better
show us the source code.

>>From the dump I saw you use PSM 100. This PSM is not valid according to
the specification, because PSM values must be odd.

Regards

Marcel




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