Re: Quectel EC21 with internal GSM MUX

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Hello Martin,

> I think these "POWER" notification from the modem are the culprit. We
> carry the attached patch in our setup to avoid those messages stalling
> the AT parser.

thank you very much for your patch! I applied it and added another case =
for "+QIND: PB DONE" too. But this still does not help to get the =
communication between host and modem unstuck again.


> With that said: Why does the modem choose to power down? Is
> someone/something toggling the power-up GPIO to the modem?

Yes, it's oFono toggling the modem power in the attempt to switch the =
modem on. The messages appeared due to the modem already being powered =
on, therefore getting powered down which takes some time, and oFono =
meanwhile trying to start the modem initialization. Sorry this was not =
the best compilation of communication samples from my side.


Best regards,

Christian


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