On Fri, Apr 19, 2024 at 04:39:46PM +0000, Bruce Johnson wrote: > I have a question about using both QMI and the serial interface with > ModemManager. > > I had little difficulty getting ModemManager's SimpleModem to connect to > T-Mobile (USA) using a Quectel EG25-G, but we found that modem wasn't > compatible with AT&T and/or a private APN used by one of our customers. We > were advised to use the Quectel EC25, and after engaging both Quectel and > AT&T, we were told that we need to insert the APN into the modem using an AT > command, AT+CGDCONT=1,"IPV4V6","mcm.com.attz". I had to tweak the kernel > config and the ModemManager build. > > Mods: > > * I built ModemManager 1.18.4 with --with-at-command-via-dbus. > * In the kernel config, I added USB Serial Converter support -> USB > driver for GSM and CDMA modems. > > After I did this, the /dev/ttyUSB[1-4] files showed up, and I was able to > issue AT commands using ModemManager, but while the modem would sort-of > connect with SimpleModem's connect method -- I am getting a Bearer, and mmcli > shows "connected" -- I receive no IP address information from the carrier. > Port wwan0 is showing up as "ignored". (mmcli output below) > > The Quectel docs also said to patch the kernel a certain way to allow use of > serial and the QMI_WWAN driver, but wwan0 is still ignored. > > Does anyone have any suggestions? > > Thanks! > > -- > Bruce Johnson > Chantilly, Virginia > USA
I will stand corrected in case - but... I don't think you need AT commands via d-bus to do this, but giving the APN via QMI somehow, depending on the object or method you use to connect. That said, you probably won't need qmi_wwan_q or whatever - the stock qmi_wwan driver from kernel, and "option" for serial should suffice. For some reason you have wwan0 (gnored) in your output which doesn't sound right. I would try to look at it/fix it first. Enrico > > > -------------------------------- > General | path: /org/freedesktop/ModemManager1/Modem/0 > | device id: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX > -------------------------------- > Hardware | manufacturer: Quectel > | model: EC25 > | firmware revision: EC25AFFAR07A14M4G > | supported: gsm-umts, lte > | current: gsm-umts, lte > | equipment id: 359401089771197 > -------------------------------- > System | device: > /sys/devices/pci0000:00/0000:00:15.0/usb1/1-4 > | drivers: option, qmi_wwan > | plugin: quectel > | primary port: ttyUSB3 > | ports: ttyUSB2 (gps), ttyUSB3 (at), ttyUSB4 (at), > wwan0 (ignored) > -------------------------------- > Status | unlock retries: sim-pin (3), sim-puk (10), sim-pin2 (3), > sim-puk2 (10) > | state: connected > | power state: on > | access tech: lte > | signal quality: 60% (recent) > -------------------------------- > Modes | supported: allowed: 2g, 3g, 4g; preferred: none > | current: allowed: 2g, 3g, 4g; preferred: none > -------------------------------- > IP | supported: ipv4, ipv6, ipv4v6 > -------------------------------- > 3GPP | imei: 3594010XXXXXXXX > | operator id: 310410 > | operator name: AT&T > | registration: home > -------------------------------- > 3GPP EPS | ue mode of operation: csps-2 > -------------------------------- > SIM | primary sim path: /org/freedesktop/ModemManager1/SIM/0 > -------------------------------- > Bearer | paths: /org/freedesktop/ModemManager1/Bearer/0 > >
