Re: Telit LE910V1 - LTE only modem

[gluedig@gmail.com]

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On 03/20/2017 02:19 PM, Lukasz Nowak wrote:
> Hi Piotr, Denis,
> 
> With the qmimodem patch I was able to bring the LE910-SVG modem on-line.
> But I had to do two things:
> 
> 1. The gprs driver was never getting attached.
> a) This statement in src/gprs.c, gprs_netreg_update()
> 	if (ofono_netreg_get_technology(gprs->netreg) ==
> 			ACCESS_TECHNOLOGY_EUTRAN)
> 		/*
> 		 * For LTE we set attached status only on successful
> 		 * context activation.
> 		 */
>                 return;
> means that the gprs->driver_attached is never set to true.
> If I remove this piece of code, the gprs->driver->set_attached() gets called, and that
> gets everything attached and working.
> 
> b) I can see, that another path to it would be:
> qmimodem/gprs.c create_nas_cb() calls qmi_service_register(QMI_NAS_SS_INFO_IND, ss_info_notify)
> But then, ss_info_notify() is never called. I think that the modem is quick enough to register
> to the network before qmi_service_register(QMI_NAS_SS_INFO_IND) is called.
> 
> c) Denis, you mentioned that I need to call ofono_gprs_cid_activated()
> Which piece of code should do that? qmimodem/network-registration.c or plugins/gobi.c?
> 
> 
> 2. qmimodem/network-registration.c:extract_ss_info() seems to be getting a corrupted 
> operator name:
> plmn->desc_len = 3
> plmn->desc[] = { 0x56, 0xfd, 0x15 }
> The first byte seems correct ('V' for Verizon), but the other two are wrong (later on, dbus
> aborts the entire ofono process, saying this is not a valid utf-8 string).
> plmn->mcc and plmn->mnc are correct (311:480 - US:Verizon)
> 
> Have you ever seen anything like that?
> If I replace the invalid characters, everything works ok. But I imagine this is not
> the right way to handle this.
> 
Hi,
I have observed that as well for some networks/sims.
I assume this is due some idiosyncrasy of Telit's QMI implementation.
And since I was not able to obtain any help form Telit regarding QMI
(not even documentation) I accepted that and patched extract_ss_info to
rewrite plmm->desc as "mcc:mnc".

> 
> Thanks for all your help with this.
> 
> Lukasz
> 
> 
> 
> On 16/03/17 09:32, Piotr Haber wrote:
>> Hi Lukasz,
>>
>> I have never useg LE910-SVG but I have used LE910-EUG which is also V1 LE910 modem.
>> It uses QMI interface and is End-of-life product according to Telit.
>> Below is a patch I used to add support for it, maybe it will help you.
>>
>> Modem is not recognized automatically, you need to point ofono  to use correct driver
>> by setting ENV{OFONO_DRIVER}="le910" in udev.
>>
>>
>>