[Bluez-users] GSM Multiplexer Protocol

[Bluez-users] GSM Multiplexer Protocol

[Daniel Haensse]

Hi lists,

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?

Thanks

regards

Dani

-- 
swissEmbedded GmbH
Daniel Haensse, Dipl. El. Ing. ETH
Zuercherstrasse 12, 5400 Baden, Switzerland
Phone ++41562100158
Fax: ++41562100157
Mobile: ++41763207732
Email: haensse@swissembedded.com


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Re: [Bluez-users] GSM Multiplexer Protocol

[Marcel Holtmann]

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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Re: [Bluez-users] GSM Multiplexer Protocol

[Marcel Holtmann]

Hi Daniel,

> ok, so I'll start from the scratch. Thanks for your reply. Do you know how to 
> get the GSM 07.10 spec? I only have the source code of a siemens multiplexer 
> driver and it don't make me very happy to analyse their code first in 
> details.

look at www.etsi.org. You can download them for free.

Regards

Marcel




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