Hello all, I am working with an mPCI Telit LE910C4 modem connected to a Linux System on a Chip running Ubunut 20.04.
With 1.18 ModemManager installed I noticed that serial ports were being listed as ignored except for a GPS port was available through a tty, this meant I couldnt issue AT commands. I also needed bit error rate from the mmlib-glib API so I decided to build ModemManager 1,21. Upon upgrading the modem no longer recognizes as a qmi device, but the AT command tty terminals are available. I was hoping for some advice on how to investigate this behavior. I did not build libqmi from source because whenever I try to compile on the device compilation freezes (overnight) on compiling certain *.o files. However, I am able to get the modem connected. Any advice on how to debug why the modem is no longer being recognized as a qmi device? I am wondering if I need to change the USB configuration of the modem,but this seems likee it would be strange, as it was interacting with the modem via qmi previously via cdc_wdm0. Below I will post output from mmcli from version 1.21 with QMI not working. Thanks, Rick -------------------------------- General | path: /org/freedesktop/ModemManager1/Modem/0 | device id: -------------------------------- Hardware | manufacturer: Telit | model: LE910C4-NF | firmware revision: 25.21.660-P0F.661806 | supported: gsm-umts, lte | current: gsm-umts, lte | equipment id: -------------------------------- System | device: /sys/devices/platform/soc@0/32c00000.bus/32e50000.usb/ci_hdrc.1/usb1/1-1/1-1.2 | drivers: option, qmi_wwan | plugin: telit | primary port: ttyUSB2 | ports: ttyUSB0 (ignored), ttyUSB1 (gps), ttyUSB2 (at), | ttyUSB3 (at), ttyUSB4 (ignored), wwan0 (ignored) -------------------------------- Status | unlock retries: sim-pin (3), sim-puk (10), sim-pin2 (10), sim-puk2 (10) | state: connected | power state: on | access tech: lte | signal quality: 85% (recent) -------------------------------- Modes | supported: allowed: 2g; preferred: none | allowed: 3g; preferred: none | allowed: 2g, 3g; preferred: none | allowed: 4g; preferred: none | allowed: 2g, 4g; preferred: none | allowed: 3g, 4g; preferred: none | allowed: 2g, 3g, 4g; preferred: none | current: allowed: 3g, 4g; preferred: none -------------------------------- IP | supported: ipv4, ipv6, ipv4v6 -------------------------------- 3GPP | imei: | operator id: 310410 | operator name: AT&T | registration: roaming | packet service state: attached -------------------------------- 3GPP EPS | ue mode of operation: csps-2 -------------------------------- SIM | primary sim path: /org/freedesktop/ModemManager1/SIM/0 -------------------------------- Bearer | paths: /org/freedesktop/ModemManager1/Bearer/0 Sent with [Proton Mail](https://proton.me/) secure email.
