Need help troubleshooting Quectel EG25 modem in Pine64 Pinephone

[Dan Williams]

On Mon, 2021-06-14 at 10:55 +0200, Aleksander Morgado wrote:
> Hey,
> 
> > 
> > > Can you run "AT+CGDCONT?" with minicom (or otherwise, running>
> > > ModemManager with --debug and then mmcli --command="AT+CGDCONT?")
> > 
> > Here's the output of atinout:
> > 
> > ```
> > $ echo "AT+CGDCONT?" | sudo atinout - /dev/ttyUSB2 -
> > 
> > ERROR
> > ```
> 
> This does not make any sense

Sometimes AT ports run limited parsers, but I've only seen that on
older modems where the limited AT port was for PPP and nothing else.
Are there any other ttys that respond to AT commands? Does this port
respond to AT+GCAP or AT+CLAC ?

Dan

> 
> > 
> > I confirmed that /dev/ttyUSB2 is the right device, as it responds
> > with
> > "OK" to "AT".
> > 
> > 
> > > 
> > > Can you run these qmicli commands?
> > > qmicli -p -d /dev/cdc-wdm0 --wds-get-profile-list=3gpp
> > 
> > $ sudo qmicli -p -d /dev/cdc-wdm0 --wds-get-profile-list=3gpp
> > Profile list retrieved:
> >         [1] 3gpp -
> >                 APN: ''
> >                 PDP type: 'ipv4-or-ipv6'
> >                 PDP context number: '1'
> >                 Username: ''
> >                 Password: ''
> >                 Auth: 'none'
> >                 No roaming: 'no'
> >                 APN disabled: 'no'
> >         [2] 3gpp -
> >                 APN: 'ims'
> >                 PDP type: 'ipv4-or-ipv6'
> >                 PDP context number: '2'
> >                 Username: ''
> >                 Password: ''
> >                 Auth: 'none'
> >                 No roaming: 'no'
> >                 APN disabled: 'no'
> >         [3] 3gpp -
> >                 APN: ''
> >                 PDP type: 'ipv4-or-ipv6'
> >                 PDP context number: '3'
> >                 Username: ''
> >                 Password: ''
> >                 Auth: 'none'
> >                 No roaming: 'no'
> >                 APN disabled: 'no'
> > 
> > 
> > Well that looks pretty empty... Is this user-configurable, or does
> > mmcli fill these in for me?
> > 
> 
> Those are the settings stored inside the module. They should have
> reported the same info as "AT+CGDCONT?".
> 
> > 
> > > qmicli -p -d /dev/cdc-wdm0 --wds-get-lte-attach-pdn-list
> > 
> > $ sudo qmicli -p -d /dev/cdc-wdm0 --wds-get-lte-attach-pdn-list
> > Attach PDN list retrieved:
> >         Current list: '1'
> >         Pending list: n/a
> > 
> > > 
> > > If your SIM card is O2 but the registration in the O2 network is
> > > not
> > > working, it may still be the initial EPS bearer settings, I think
> > > you
> > > should focus on debugging that.
> > > 
> > 
> > That's what "--3gpp-set-initial-eps-bearer-settings" is for, right?
> > Is
> > there any other command that deals with the initial EPS bearer
> > settings?
> > 
> > It seems to me that merely entering the APN for the initial bearer
> > settings doesn't change anything, and I don't know which ip-types
> > or
> > authentications this provider supports.
> 
> You need to know what your provider expects as initial APN settings.
> 
> > I have tried some, and for some
> > combinations a "--3gpp-register-home" tells me it connected
> > successfully, while in mmcli I still see that it's connected to the
> > wrong operator.
> 
> The "--3gpp-register-home" option instructs the modem to
> automatically
> select which is the best network to register to. If there are more
> than one suitable networks and it failed to register in one of them
> it
> may have tried to register in a different one.
> 
> > In fact today it has already connected to every
> > operator except the one I'd need it to. I also still can't enforce
> > it.
> > 
> 
> The registration in a given operator is mandated by what your SIM
> card
> dictates. ModemManager doesn't do any explicit attempt to register in
> a given operator by itself; if you set it to "auto"
> (--3gpp-register-home), the modem will try to do what's best for you.
> 
> > 
> > Is there something like a command to generate a full dump of all
> > settings that mmcli works with, such that I could ask someone with
> > a
> > working modem on the same provider to show me their settings?
> 
> There is no such thing as "settings mmcli works with"; all the
> settings are inside the modem, and you already listed the ones in
> yours with the qmicli wds profile list. The settings being used for
> initial APN are the ones in profile #1 (as per your
> --wds-get-lte-attach-pdn-list call).
> 
> So what you're using as settings is the empty APN and IPv4v6. If your
> network requires an specific initial APN you need to configure that
> in
> that profile, with --3gpp-set-initial-eps-bearer-settings
>