Sending SMS in PDU mode fails.

[José]

On Mon, Aug 7, 2017 at 2:26 PM, Daniele Palmas <dnlplm at gmail.com> wrote:
> 2017-08-07 11:04 GMT+02:00 Aleksander Morgado <aleksander at aleksander.es>:
> >>>
> >>> As far as I know this happens only for Verizon customization that uses
> >>> SMS over IMS with 3GPP2 pdu.
> >>>
> >>>> Isn't this actually a bit weird, given that
> >>>> the LE866-SV1 is actually LTE-only (i.e. 3GPP-only, not 3GPP2)?
> >>>
> >>> Looks like a carrier requirement for SMS
>
> Or maybe we can let each plugin take care of this: for Telit modems
> probably we can think of checking some substring in the model name
> (e.g. -SV or -NV). Maybe other modems have a similar rule or some
> custom AT command that can be checked for that.
>

I am not following all the technical details of the thread, but if we
assume3GPP2 for the Telit LE866-SV modem, would that be a correct
patch for ModemManager ?

It is my understanding that this modem can only be used with Verizon SIM cards.

On Mon, Aug 7, 2017 at 2:26 PM, Daniele Palmas <dnlplm at gmail.com> wrote:
> 2017-08-07 11:04 GMT+02:00 Aleksander Morgado <aleksander at aleksander.es>:
>>>>>>>> I can confirm that LE866-SV1 uses Telit custom 3GPP2 PDU format: there
>>>>>>>> should be a PDU example in the AT commands user guide (see +CMGS
>>>>>>>> 3GPP2), while EU variants use 3GPP.
>>>>>>>
>>>>>>> Thanks for the information. Then it is expected that the USA version (the
>>>>>>> one I reported) does not work with ModemManager because it uses 3GPP2 PDU
>>>>>>> format? Or is this format also supported in ModemManager?
>>>>>>>
>>>>>>
>>>>>> My understanding is that it is currently not supported in ModemManager.
>>>>>>
>>>>>
>>>>> But... https://cgit.freedesktop.org/ModemManager/ModemManager/tree/src/mm-sms-part-cdma.c
>>>>>
>>>>> The issue here is that the message isn't formatted as 3GPP2/CDMA
>>>>> because the modem is actually an LTE modem (i.e. 3GPP). As soon as a
>>>>> modem is 3GPP, we use the 3GPP format, see:
>>>>> https://cgit.freedesktop.org/ModemManager/ModemManager/tree/src/mm-base-sms.c#n311
>>>>>
>>>>> The question now would be, is this something that happens to all
>>>>> US-version Telit modems?
>>>>
>>>> As far as I know this happens only for Verizon customization that uses
>>>> SMS over IMS with 3GPP2 pdu.
>>>>
>>>>> Isn't this actually a bit weird, given that
>>>>> the LE866-SV1 is actually LTE-only (i.e. 3GPP-only, not 3GPP2)?
>>>>
>>>> Looks like a carrier requirement for SMS.
>>>>
>>>
>>> See also Reinhard's comment about this:
>>>
>>> https://lists.freedesktop.org/archives/modemmanager-devel/2016-January/002468.html
>>>
>>
>> Interesting... I now wonder how we can setup all this to work
>> automatically, if at all possible. We don't have any carrier-specific
>> customization right now anywhere. Maybe some user specified parameter
>> asking for a specific type of PDU to generate?
>>
>
> For this specific scenario would it be a too ugly hack blindly
> re-trying with 3GPP2 if 3GPP fails and then storing the setting if
> successful?
>
> Unfortunately the result code is not helpful here (CMS ERROR: 41 that
> is temporary failure), but this could be something Telit specific...
>
> Or maybe we can let each plugin take care of this: for Telit modems
> probably we can think of checking some substring in the model name
> (e.g. -SV or -NV). Maybe other modems have a similar rule or some
> custom AT command that can be checked for that.
>
> Just throwing some ideas, not sure how much they make sense..
>
> However a more generic way to address carrier customization issues
> could be helpful for other scenarios.
>
> Daniele
>
>> --
>> Aleksander
>> https://aleksander.es