initial bearer apn

[Tom Isaacson]

I raised a bug related to this but haven't had a chance to debug it yet:
https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/665

When I use QMI I find some SIM cards can connect automatically, they
don't need me to provide the APN. But ModemManager seems to insist on
it.


On Fri, Mar 17, 2023 at 6:11 AM Peter Naulls <peter at chocky.org> wrote:
>
> On 3/16/23 11:53, Juan A. Rubio wrote:
>
> > Thanks Peter.
> >
> > What mechanism did you use to set the initial bearer? I'm using a
> > Network Manager connection profile in which I'm setting the APN (e.g.
> > myapn), not Telstra.internet
> >
> > [gsm]
> > apn=myapn
> > password=""
> > username=""
> >
> > Do you use mmcli or MM DBus API instead of Network Manager?
>
> mmcli where possible.  My of my handling is in OpenWrt's ash; I never
> quite got to grips with DBus.
>
> Here's the section of script where we set the APN; I think logic is clear
> enough.  I think it likely that there's a better way, but in our testing
> this is reliable.
>
> I'm sure Alex has more commentary here.
>
>
>       config_apn=$(uci get network.wwan.apn 2>/dev/null || true)
>
>        initial_bearer_apn=$(mmcli -m $modem_num 2>/dev/null | grep "initial
> bearer apn")
>
>        # Might be blank if not ready yet
>        if [ -n "${initial_bearer_apn}" ] ; then
>          curr_apn_value=$(echo ${initial_bearer_apn} | sed 's#.*: ##' || true)
>
>          if [ "${config_apn}" == "${curr_apn_value}" ] ; then
>            message_out "Initial bearer APN correctly set to '${config_apn}'"
>            apn_check_done=true
>
>          else
>            message_out "Initial bearer APN set to '${curr_apn_value}' vs
> configured value '${config_apn}' - setting initial bearer"
>
>            mmcli -m $modem_num --enable || true
>            mmcli -m $modem_num
> --3gpp-set-initial-eps-bearer-settings="apn=${config_apn},ip-type=ipv4v6" || true
>          fi
>        fi
>


-- 
Tom Isaacson