From: Marcel Holtmann <marcel@holtmann.org>
To: Daniel Haensse <haensse@swissembedded.com>
Cc: uclinux-dev <uclinux-dev@uclinux.org>, bluez-users@lists.sourceforge.net
Subject: Re: [Bluez-users] GSM Multiplexer Protocol
Date: Tue, 28 Sep 2004 10:10:52 +0200 [thread overview]
Message-ID: <1096359052.4684.20.camel@notepaq> (raw)
In-Reply-To: <200409262123.50707.haensse@swissembedded.com>
Hi Daniel,
> we need GPRS and SMS services at the same time. For this reason a multiplexer
> protocol is supported in GSM 07.10 which creates several virtual serial ports
> which can be controlled with normal AT commands. The AT commands are routed
> through a software multiplexer circuit which on the other end is connected to
> the real GSM modem's tty.
>
> Is there any GSM multiplexer protocol for linux available?
>
> Unfortunately, I did not find any driver in the kernel or userland to support
> this. I did find out so far that RFCOMM might be a good point to start
> writing virtual tty ports as bluetooth also supports GSM 07.10 in connection
> with the RFCOMM protocol. The basic idea behind it is to interface the sock
> to a the GSM modem TTY instead of L2CAP. Any hints?
the RFCOMM is not a good starting point, because it is only a subset of
GSM 07.10 specification and they already changed some parts of them to
met their requirements.
You should implement it as a serial line discipline like we have done
for the hci_uart driver, but as far as I know nobody started working on
such a kernel driver.
Regards
Marcel
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next prev parent reply other threads:[~2004-09-28 8:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-26 19:23 [Bluez-users] GSM Multiplexer Protocol Daniel Haensse
2004-09-28 8:10 ` Marcel Holtmann [this message]
[not found] ` <200409282203.25838.haensse@swissembedded.com>
2004-09-29 22:24 ` Marcel Holtmann
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