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modem_cellular: Add support for the simcom a76xx modem #90081

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Add support for the simcom a76xx modem which is similar to the simcom 7080 but has a few key differences. Tested with a simcom A7672SA module but as there is a single simcom A76XX AT commands manual, the driver should work with other modems of the series.

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olalonde added 3 commits May 16, 2025 20:47
Add support for the simcom a76xx modem which is similar to the simcom 7080
but has a few key differences. Tested with a simcom A7672SA module but as
there is a single simcom A76XX AT commands manual, the driver should work
with other modems of the series.

Signed-off-by: Olivier Lalonde <[email protected]>
Add a shutdown script to the a76xx modem driver.

Signed-off-by: Olivier Lalonde <[email protected]>
Fixes a bug that prevent PPP from reconnecting when modem was restarted.

Signed-off-by: Olivier Lalonde <[email protected]>
Optionally power on the GNSS module of simcom a76xx during the chat init
script. This is necessary because it does not seem possible to power on the
GNSS once the modem is in CMUX mode. Configurable through
`CONFIG_MODEM_CELLULAR_POWER_ON_GNSS`.

Signed-off-by: Olivier Lalonde <[email protected]>
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