AT commands in U0001AT+FOOBAR form

AT commands in U0001AT+FOOBAR form

[Pavel Machek]

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Hi!

I have a motorola droid 4 here; it uses gsm 07.10 multiplex. Over
that, there are AT commands, but prefixed with serial numbers, in
U0001AT+FOOBAR form. Corresponding reply then has U0001 prefix, too.
Has anyone seen that before? Any hints for me trying to add the
support?

Best regards,
                                                                        Pavel
									
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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Re: AT commands in U0001AT+FOOBAR form

[Denis Kenzior]

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Hi Pavel,

On 05/08/2018 04:44 PM, Pavel Machek wrote:
> Hi!
> 
> I have a motorola droid 4 here; it uses gsm 07.10 multiplex. Over
> that, there are AT commands, but prefixed with serial numbers, in
> U0001AT+FOOBAR form. Corresponding reply then has U0001 prefix, too.
> Has anyone seen that before? Any hints for me trying to add the
> support?
> 

I've never seen anything like it.  The 07.10 was explicitly designed so 
that the AT command processor didn't need to know or care whether it was 
connected directly to the serial port or to the multiplexer.  E.g. AT 
commands should not be modified in any way.

Are you use this is a 07.10 multiplexer and not something else?  What is 
the serial number exactly? Serial number of the multiplexer channel or ?

I would look into gatchat/gatmux.c and see if you can implement a new 
GAtMuxDriver specifically for this hardware.

Regards,
-Denis

Re: AT commands in U0001AT+FOOBAR form

[Pavel Machek]

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Hi!

> >I have a motorola droid 4 here; it uses gsm 07.10 multiplex. Over
> >that, there are AT commands, but prefixed with serial numbers, in
> >U0001AT+FOOBAR form. Corresponding reply then has U0001 prefix, too.
> >Has anyone seen that before? Any hints for me trying to add the
> >support?
> >
> 
> I've never seen anything like it.  The 07.10 was explicitly designed so that
> the AT command processor didn't need to know or care whether it was
> connected directly to the serial port or to the multiplexer.  E.g. AT
> commands should not be modified in any way.
> 
> Are you use this is a 07.10 multiplexer and not something else?  What is the
> serial number exactly? Serial number of the multiplexer channel or ?

Looks like 07.10 multiplexer...

https://github.com/tmlind/droid4-ngsm/

Serial number seems to be "serial number of command" during normal
operation.

We may be able to get kernel to strip the extra U1234 stuff.

For now I'm using usb interface to the modem, which eats extra power
but does not have this problem.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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