From: Marcel Holtmann <marcel@holtmann.org>
To: BlueZ Mailing List <bluez-users@lists.sourceforge.net>
Subject: Re: [Bluez-users] Multiple Bluetooth connections
Date: Wed, 16 Mar 2005 10:42:10 +0100 [thread overview]
Message-ID: <1110966130.9818.95.camel@pegasus> (raw)
In-Reply-To: <42372E0A.80002@futurlink.com>
Hi Pedro,
> In the application that I am developing, I want to send simultaneous
> OBEX messages to different OBEX servers over Bluetooth. I am using
> OpenOBEX for this purpose. There are two problems I am facing.
>
> On the one hand, it seems that there is only room to establish one
> Bluetooth connection at a time. If I start many OBEX pushes
> simultaneously, only the first one succeeds. The others fail usually
> with error "Device or resource busy" (errno=16); sometimes even with
> "Software caused connection abort" (errno=103). Once the first
> connection is established and while sending OBEX data, I can establish
> another connection.
>
> I just want to make clear that the problem is with the establishment of
> the connection. I am fully aware that it is possible to handle various
> on-going connections with no problems and I have succeeded with that. Is
> there a limitation with Bluetooth or BlueZ that allows only one RFCOMM,
> L2CAP or HCI connection establishment?
this is a hardware limit and I don't know of any chip that is capable of
establishing two connections at the same time. From what I know this
will never be possible, but you should better ask a radio/baseband
expert for a correct answer.
> On the other hand, some connections die before sending the data, but it
> seems that the file descriptor of this connection does not receive any
> notification (I use select() on all file descriptors, with the file
> descriptor in the read mask). I know that this could be due to a problem
> with my program, a problem with OpenOBEX or the BlueZ version I am using
> (it is not the latest). In any case, to track down the cause, I would
> like to know how can I monitor the Bluetooth connections (at any level,
> but preferably RFCOMM) that a process (or the whole system) has. What I
> am looking for is a tool like netstat.
Using poll() or select() is the right way. About what version of the
kernel and library/utils are we talking?
Regards
Marcel
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next prev parent reply other threads:[~2005-03-16 9:42 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-15 18:48 [Bluez-users] Multiple Bluetooth connections Pedro Monjo Florit
2005-03-15 19:27 ` sir
2005-03-16 9:42 ` Marcel Holtmann [this message]
2005-03-16 11:23 ` Pedro Monjo Florit
2005-03-16 11:44 ` Marcel Holtmann
[not found] ` <marcel@holtmann.org>
2005-03-16 10:40 ` Peter Stephenson
2018-10-30 10:24 ` [PATCH v2] Bluetooth: Support fast advertising interval Bharat Bhusan Panda
2018-11-13 9:00 ` Panda, Bharat B
2018-11-23 10:52 ` Panda, Bharat B
2018-12-07 12:34 ` Panda, Bharat B
2018-12-18 23:30 ` Marcel Holtmann
2019-02-04 9:10 ` Panda, Bharat B
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