<html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> </head> <body text="#000000" bgcolor="#FFFFFF"> I have a embedded linux system, which has been used with a Quectel UC20 device without any issues, but moving to the Quectel EC21 is proving problematic. Setup is: <blockquote><tt>Zynq 7000 ARM SOC EC21 dev-kit (connected via USB) </tt><tt>Analog Devices linux kernel 4.4 -- monkey patched for EC21 using: </tt> <blockquote><tt><a class="moz-txt-link-freetext" href="https://www.quectel.com/UploadImage/Downlad/Quectel_WCDMA&LTE_Linux_USB_Driver_User_Guide_V1.8.pdf">https://www.quectel.com/UploadImage/Downlad/Quectel_WCDMA&LTE_Linux_USB_Driver_User_Guide_V1.8.pdf</a></tt> </blockquote> <tt>Debian Jessie (8.10)</tt><tt> </tt><tt>ii modemmanager 1.4.0-1 armhf</tt><tt> </tt><tt>ii network-manager 0.9.10.0-7 armhf</tt><tt> </tt></blockquote> After the patches were applied, the device is recognise on the USB bus and MM also recongises the modem. However I'm getting a failed status of SIM not found ("sim-missing"), but the SIM is present the dev-kit is known to work using a Windows box (i.e. gets an IP address from the 4G service). In linux, after power up, MM shows the "sim-missing" failure reason. Interestingly, after I press the reset button on the dev-kit, MM recognises a new modem and shows a "registered" status. <div class="moz-text-html" lang="x-unicode">I system now recognises the modem (/dev/cdc-wdm0 is registered as well as some /dev/ttyUSB* devices). However, nmcli shows the device as a ttyUSB instead of cdc-wdm0 !! Looking at mmcli outupt, it seems the "primary port" changes from "cdc-wdm0" to "ttyUSB8". Is this normal? Can I force it to only use cdc-wdm? Why does the SIM get recognised after pressing the reset button and using the ttyUSB interface, and not recongised after powerup and using the cdc-wdm0 interface? I also tried connecting the dev-kit to a Debian 9 VM, but I couldn't get MM to recognise it at all. The ttyUSB and cdc-wdm0 interfaces were present, but "mmcli -L" shows nothing ("No modems found") Could this be related or is it a different problem altogether? How can I get MM to recognise the modem in the Debian 9 setup? <blockquote><tt>linux k</tt><tt>ernel 4.9.65-3</tt><tt> </tt><tt>modemmanager 1.6.4-</tt><tt>1</tt><tt> </tt><tt>network-manager 1.6.2-3</tt> </blockquote> Any help greatly appreciated :) Brendan. <hr size="2" width="100%"> Output of ModemManager CLI (mmcli) after power up (shows "sim-missing") <blockquote><tt># mmcli -m 6</tt> <tt> </tt> <tt> </tt><tt>/org/freedesktop/ModemManager1/Modem/6 (device id 'cf405e3ef544de99803c75ef99bcee51b6560e65')</tt> <tt> </tt><tt> -------------------------</tt> <tt> </tt><tt> Hardware | manufacturer: 'QUALCOMM INCORPORATED'</tt> <tt> </tt><tt> | model: '0'</tt> <tt> </tt><tt> | revision: 'EC21AUTFAR02A03M4G 1 [Mar 21 2016 11:00:00]'</tt> <tt> </tt><tt> | supported: 'gsm-umts</tt> <tt> </tt><tt> | lte</tt> <tt> </tt><tt> | gsm-umts, lte'</tt> <tt> </tt><tt> | current: 'lte'</tt> <tt> </tt><tt> | equipment id: '864430010001091'</tt> <tt> </tt><tt> -------------------------</tt> <tt> </tt><tt> System | device: '/sys/devices/soc0/amba/e0002000.usb/ci_hdrc.0/usb1/1-1'</tt> <tt> </tt><tt> | drivers: 'option1, qmi_wwan'</tt> <tt> </tt><tt> | plugin: 'Generic'</tt> <tt> </tt><tt> | primary port: 'cdc-wdm0'</tt> <tt> </tt><tt> | ports: 'ttyUSB8 (at), ttyUSB9 (at), cdc-wdm0 (qmi), ttyUSB4 (qcdm), wwan0 (net)'</tt> <tt> </tt><tt> -------------------------</tt> <tt> </tt><tt> Numbers | own : 'unknown'</tt> <tt> </tt><tt> -------------------------</tt> <tt> </tt><tt> Status | lock: 'unknown'</tt> <tt> </tt><tt> | unlock retries: 'unknown'</tt> <tt> </tt><tt> | state: 'failed'</tt> <tt> </tt><tt> | failed reason: 'sim-missing'</tt> <tt> </tt><tt> | power state: 'unknown'</tt> <tt> </tt><tt> | access tech: 'unknown'</tt> <tt> </tt><tt> | signal quality: '0' (cached)</tt> <tt> </tt><tt> -------------------------</tt> <tt> </tt><tt> Modes | supported: 'allowed: 4g; preferred: none'</tt> <tt> </tt><tt> | current: 'allowed: any; preferred: none'</tt> <tt> </tt><tt> -------------------------</tt> <tt> </tt><tt> Bands | supported: 'unknown'</tt> <tt> </tt><tt> | current: 'unknown'</tt> <tt> </tt><tt> -------------------------</tt> <tt> </tt><tt> IP | supported: 'ipv4, ipv6, ipv4v6'</tt> <tt> </tt><tt> -------------------------</tt> <tt> </tt><tt> SIM | path: 'none'</tt> <tt> </tt> <tt> </tt><tt> -------------------------</tt> <tt> </tt><tt> Bearers | paths: 'none'</tt> </blockquote> Output of ModemManager CLI (mmcli) after pressing reset button (shows "sim-missing") <blockquote><tt># mmcli -m 7</tt><tt> </tt><tt> </tt><tt>/org/freedesktop/ModemManager1/Modem/7 (device id '6b3daac3d42eca119fcfa4462b377af7398551d4')</tt><tt> </tt><tt> -------------------------</tt><tt> </tt><tt> Hardware | manufacturer: 'Quectel'</tt><tt> </tt><tt> | model: 'EC21'</tt><tt> </tt><tt> | revision: 'EC21AUTFAR02A03M4G'</tt><tt> </tt><tt> | supported: 'lte'</tt><tt> </tt><tt> | current: 'lte'</tt><tt> </tt><tt> | equipment id: '864430010001091'</tt><tt> </tt><tt> -------------------------</tt><tt> </tt><tt> System | device: '/sys/devices/soc0/amba/e0002000.usb/ci_hdrc.0/usb1/1-1'</tt><tt> </tt><tt> | drivers: 'qmi_wwan, option1'</tt><tt> </tt><tt> | plugin: 'Generic'</tt><tt> </tt><tt> | primary port: 'ttyUSB8'</tt><tt> </tt><tt> | ports: 'ttyUSB8 (at), ttyUSB9 (at), ttyUSB4 (qcdm), wwan0 (net)'</tt><tt> </tt><tt> -------------------------</tt><tt> </tt><tt> Numbers | own : 'unknown'</tt><tt> </tt><tt> -------------------------</tt><tt> </tt><tt> Status | lock: 'none'</tt><tt> </tt><tt> | unlock retries: 'unknown'</tt><tt> </tt><tt> | state: 'registered'</tt><tt> </tt><tt> | power state: 'on'</tt><tt> </tt><tt> | access tech: 'lte'</tt><tt> </tt><tt> | signal quality: '100' (recent)</tt><tt> </tt><tt> -------------------------</tt><tt> </tt><tt> Modes | supported: 'allowed: 2g, 3g, 4g; preferred: none'</tt><tt> </tt><tt> | current: 'allowed: 2g, 3g, 4g; preferred: none'</tt><tt> </tt><tt> -------------------------</tt><tt> </tt><tt> Bands | supported: 'unknown'</tt><tt> </tt><tt> | current: 'unknown'</tt><tt> </tt><tt> -------------------------</tt><tt> </tt><tt> IP | supported: 'none'</tt><tt> </tt><tt> -------------------------</tt><tt> </tt><tt> 3GPP | imei: '864430010001091'</tt><tt> </tt><tt> | enabled locks: 'none'</tt><tt> </tt><tt> | operator id: '50501'</tt><tt> </tt><tt> | operator name: 'Telstra Mobile Telstra'</tt><tt> </tt><tt> | subscription: 'unknown'</tt><tt> </tt><tt> | registration: 'home'</tt><tt> </tt><tt> -------------------------</tt><tt> </tt><tt> SIM | path: '/org/freedesktop/ModemManager1/SIM/2'</tt><tt> </tt><tt> </tt><tt> -------------------------</tt><tt> </tt><tt> Bearers | paths: 'none'</tt><tt> </tt></blockquote> Regards, Brendan </div> </body> </html>