Re: Option to not power off radio during start ofono

[Richard =?unknown-8bit?q?R=C3=B6jfors?= <richard.rojfors@gmail.com>]

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Hi Denis,

Den ons 19 feb. 2020 kl 19:52 skrev Denis Kenzior <denkenz@gmail.com>:

> Hi Richard,
>
> On 2/18/20 3:19 AM, Richard Röjfors wrote:
> > Hi,
> >
> > Ofono (at least for ublox) is always powering off the radio during start.
> > This can of course be handy of programmatic reasons to bring the modem
> > to a known state.
> > Some configuration requires the radio to be turned off;  for instance
> > the LTE auto connect APN. But on the other hand these are stored in
> > non-volatile memory and could be configured before hand.
>
> So by default we bring the device into airplane mode until the SIM card
> has been initialized.  Also, the policy decision of bringing the radio
> up / down was left to external services such as ConnMan.
>
> >
> > The big drawback with turning it off is that it might take time to
> > register again when the radio is on. I have seen it taking more than 10
> > minutes in extreme cases.
> >
>
> That's nuts.  Shouldn't take more than a few seconds?
>

I would assume so too, but that's what we have experienced.


>
> > In embedded systems this can be a big issue.
> >
>
> Indeed.
>
> > I'm thinking of adding a configuration option to keep the radio on
> > during start.
> >
> > Whats the general thought about this?
> >
>
> Not sure.  Are you certain that adding such low-level config options is
> the right approach?


I'm not sure thats why I started the discussion. The other suggestion
in this thread was to use some environment variable to pass the
information, maybe thats a better way?


>   Even documenting / explaining what and why this
> configuration option is there would be challenging I imagine.
>

Yes it will be. I think I'm convinced we should not have this
feature upstreams.

--Richard

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