write(2) might return less than expected due to various reasons.
Therefore, unless we are dealing with a critical error, it must be
called in a loop until all bytes are written.
Automatically fetch the GNSS assistance data from the Web
to heavily reduce the time to acquire a GNSS lock by uploading
the assistance data to the modem.
This feature is optional and can be disabled in the configuration
as people may prefer to not download the assistance data from
the Quectel/Qualcomm servers.
Also configure the GNSS engine to optimize the performance
and power consumption.
Allow the modem to enter soft sleep when
we don't talk to the modem using AT commands.
This was already the case in suspend, but
not during runtime. By only waking the modem
from soft sleep when we need to send
an AT command, we can save some power.
The AT commands list for each stage is now configured per-device, as
well as the UART port to be used.
As this list can be changed by the user, there is no more need for a
special GNSS-related option
This commit prepares the use of device-specific configuration files.
These files should be named after the device-tree `compatible` string
with the `toml` extension.
`eg25-manager` will search for config files in
`<prefix>/etc/eg25-manager` first (or `/etc/eg25-manager` if prefix is
`/usr`), then in `<prefix>/share/eg25-manager`.
The EG25 modem needs at least 2 minutes after indicating 'RDY'
to be fully operational. If the modem is suspended before that,
calls or texts may not be seen by the userspace.
This mostly occurs when a full reboot or poweroff/poweron
sequence of the phone is performed.
:
There's no reason we should wait 3s before retrying a failed AT command.
This can even cause issues with suspend inhibition: 3 retries of a
failed command would take 9s, while logind ignores the inhibitor after
only 5s.
Reducing the delay to 500ms should be enough and wouldn't interfere with
suspend inhibition.
Fixes#3
The response can include the command and an error number, so we want to
only check it contains ERROR, even if it's replying more than just the
'ERROR' string.
