Hi again,
I did some more work and now I am able to connect manually (without
ModemManager). All that’s required is the AT^SWWAN=1,1 command if the APN is
already correctly configured. I checked this via AT+CGDCONT?. Note, that this
only works for CID=1. After changing the APN for CID=1, the modem must be
forced to re-attach since the modem auto-attaches after power-up. More on this
can be found in the chapter “Attaching to LTE Networks” in AT manual. Another
interesting fact is that the modem appends a string to the APN after it has
attached, in my case “.mnc009.mcc242.gprs”. I’m not sure if this is common.
In order to debug the command sequence issued by ModemManager, I extracted all
commands sent by the ModemManager from the debug logs incl. their timing. I
then replayed them with the same (similar) timing manually from a script, i.e.
without ModemManager running. I made sure that the modem was freshly booted in
both cases. Curiously, when replaying the commands, the AT^SWWAN commands
succeeds. This leaves me a little puzzled.
Does ModemManager issue commands concurrently? I saw in the logs both “device
open count is 2 (open)” and “device open count is 3 (open)”. Could that mean
that sometimes two AT commands are sent at the same time?
Best regards,
Sven
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