Watching for registration with python

Dan Williams dcbw at
Fri Sep 1 15:51:12 UTC 2017

On Fri, 2017-09-01 at 14:26 +0100, colin.helliwell at
> I've been having a look at the modem-watcher-python example, and
> would like
> to do something similar - namely wait until the modem has registered
> on the
> network and then grab the MCC/MNC.
> Is there some sort of event I can hook for this (similar to what the
> example
> does with ' object-added'), or do I just need to poll?
> Thanks has the modem watching stuff already.  What you want to
do is modify the on_object_added() method to:

1) check modem.get_state() >= ModemManager.ModemState.REGISTERED
2) if yes, then grab the MCC/MNC with something like:

    mccmnc = obj.get_modem_3gpp().get_operator_code()

3) if no, then connect to the 'state' property notifier:

        modem.connect('notify::state', self.modem_state_changed, obj)

and then have a separate function that handles that change:

    def modem_state_changed(self, modem, prop, obj):
        if modem.get_state() >= ModemManager.ModemState.REGISTERED:
            mccmnc = obj.get_modem_3gpp().get_operator_code()

The part I'm a bit fuzzy on now is getting the mcc/mnc, because for
that you need to call obj.get_modem_3gpp() I think.


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