On Tue, Feb 18, 2020 at 10:19 AM Richard Röjfors
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.
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.
In embedded systems this can be a big issue.
I'm thinking of adding a configuration option to keep the radio on during start.
Whats the general thought about this?
my opinion would be to keep it like that.
it can generate several headaches for several use cases, and break
for example when the SIM could change as compared with the previous
boot. Then it becomes much harder to recover from this situation.
it would be better to be able to boot the modem in airplane mode,
directly, so that there is no flip-flop effect.
In any case I have never observed 10 minutes.
If this really happens, either the signal is so low that in any case
the link will be pretty unstable, or the stack needs debugging.
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