Re: why Unsolicited result reponse have to start with <CR><LF> - espacially for CREG/CGREG/CEREG

[Dan Williams <dcbw redhat com>]

On Wed, 2013-02-20 at 21:15 +0000, Ori Inbar wrote:
> Hello all.
>
> I don’t understand why unsolicited result codes have to start with
> <CR><LF> by definition.
>
> I can see this is expected by the way CREG/CEREG/CGREG unsolicited
> response regex is created in mm_3gpp_creg_regex_get
> (mm-modem-helpers.c)

Is this the case for *all* unsolicited responses from your device, or
only CREG/CGREG/CEREG?

> This is not required by the standard 3GPP 27 007.

You are correct; it appears as though V=1 controls whether or not the
responses to *solicited* commands are prefixed with <CR><LF> at least,
and ModemManager sends that to all devices.  For unsolicited responses,
you're correct that the standard does not specify, though I would at
least expect devices to follow the same format as they do for solicited
responses with V1, which is to say they are prefixed with <CR><LF>.

If this is a problem with your device, we can certainly look into
changing it; we just need to make sure that changing it wouldn't cause
bad behavior on all the other devices.

Dan

>  
>
> regards
>
>  
>
> Ori Inbar
>
> Sr. Software and Application Eng.
>
> Altair Semiconductor, Inc
>
> orii altair-semi com
>
> +1-(469)-579-8673
>
> +972-(3)-9710434
>
>  
>
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