Hi Since I sent you this, I made some progress- - Modified ublox plugin to identify this modem as 4g - found out that the AT+COPS=0 you always send, does not return or return some proprietary CME code. that is because the modem does auto-registration and sending COPS interferes with that. That is stated in the datasheet. So removed it and it everything started working. - I do have still problems with specific devices which return error [modem0] couldn't load UE mode of operation for EPS: Serial command timed out. I guess that’s serial port hung from some previous command?
ron -----Original Message----- From: Aleksander Morgado <aleksande...@chromium.org> Sent: Monday, September 4, 2023 11:28 PM To: ron <ron.jac...@gmail.com> Cc: modemmanager-devel@lists.freedesktop.org Subject: Re: ublox SARA does not connect Hey > So its been a few months, and now when we install the product in US, trying > to connect to Verizon and tmobile, I face problems again. > Modem is ublox sara r5, which works through serial port AT commands only. > The modem seems to be connected, when issuing AT+CGDCONT , but modem > manager +network manager do not go ahead to create a connection > Attached logs > The modem is indeed registered as we can see the initial EPS bearer IP address for the vzwadmin APN, but for some reason MM doesn't know about that. I can see MM trying +CREG? and +CGREG? but they both seem to return the reg state as idle. Could you run +CEREG? manually in the AT port to see what it returns? The modem is detected as a 1-port AT generic modem, and none of the capability queries we do end up telling us it may be 4G capable (which is why we don't try +CEREG to check) ModemManager[573]: <info> [1692200059.641466] [device /sys/devices/platform/soc@0/30800000.bus/30860000.serial] creating modem with plugin 'generic' and '1' ports ... ModemManager[573]: <debug> [1692200059.704189] [modem0/ttymxc0/at] --> 'AT+WS46=?<CR>' ModemManager[573]: <debug> [1692200059.716311] [modem0/ttymxc0/at] <-- '<CR><LF>+CME ERROR: 100<CR><LF>' -- Aleksander
