嵌入式 Linux 上带有调制解调器管理器和网络管理器的 USB 调制解调器 (yocto dunfell)

问题描述

我正在尝试让 USB 调制解调器在我的嵌入式系统上工作，该系统使用来自 Yocto Dunfell 的 Linux 以及 ModemManager 和 NetworkManager。

如下所示，我可以连接网络上的调制解调器，但无法创建连接并打开接口。

以下是不同命令的输出：

root@rpi-cm3:/# mmcli -L
    /org/freedesktop/ModemManager1/Modem/2 [Telit] LE910-EU V2

root@rpi-cm3:/# mmcli -m 2
  --------------------------------
  General  |            dbus path: /org/freedesktop/ModemManager1/Modem/2
           |            device id: d522cda0f436245296a7a9e47c981e9601af3bc7
  --------------------------------
  Hardware |         manufacturer: Telit
           |                model: LE910-EU V2
           |    firmware revision: 20.00.402
           |            supported: gsm-umts,lte
           |              current: gsm-umts,lte
           |         equipment id: 351622072422039
  --------------------------------
  System   |               device: /sys/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.5
           |              drivers: cdc_acm,cdc_ncm
           |               plugin: Telit
           |         primary port: ttyACM0
           |                ports: ttyACM1 (unknown),ttyACM3 (at),ttyACM5 (unknown),|                       wwan0 (net),ttyACM0 (at),ttyACM4 (unknown),ttyACM2 (unknown)
  --------------------------------
  Status   |                state: registered
           |          power state: on
           |          access tech: umts
           |       signal quality: 57% (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: 2g,4g; preferred: none
  --------------------------------
  Bands    |            supported: egsm,dcs,utran-1,utran-8,eutran-1,eutran-3,eutran-7,|                       eutran-8,eutran-20
           |              current: egsm,eutran-1
  --------------------------------
  IP       |            supported: ipv4,ipv6,ipv4v6
  --------------------------------
  3GPP     |                 imei: 351622072422039
           |         registration: home
  --------------------------------
  3GPP EPS | ue mode of operation: csps-2
  --------------------------------
  SIM      |            dbus path: /org/freedesktop/ModemManager1/SIM/2
  --------------------------------
  Bearer   |            dbus path: /org/freedesktop/ModemManager1/Bearer/1

root@rpi-cm3:/# mmcli -b 1
  ------------------------
  General    |  dbus path: /org/freedesktop/ModemManager1/Bearer/1
             |       type: default
  ------------------------
  Status     |  connected: no
             |  suspended: no
             | ip timeout: 20
  ------------------------
  Properties |        apn: gprs.swisscom.ch
             |    roaming: allowed

root@rpi-cm3:/# nmcli device show
GENERAL.DEVICE:                         wwan0
GENERAL.TYPE:                           wwan
GENERAL.HWADDR:                         00:00:11:12:13:14
GENERAL.MTU:                            1500
GENERAL.STATE:                          20 (unavailable)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --

GENERAL.DEVICE:                         eth0
GENERAL.TYPE:                           ethernet
GENERAL.HWADDR:                         B8:27:EB:F7:A1:B3
GENERAL.MTU:                            1500
GENERAL.STATE:                          10 (unmanaged)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --
WIRED-PROPERTIES.CARRIER:               off
IP4.GATEWAY:                            --
IP6.GATEWAY:                            --

GENERAL.DEVICE:                         lo
GENERAL.TYPE:                           loopback
GENERAL.HWADDR:                         00:00:00:00:00:00
GENERAL.MTU:                            65536
GENERAL.STATE:                          10 (unmanaged)
GENERAL.CONNECTION:                     --
GENERAL.CON-PATH:                       --
IP4.ADDRESS[1]:                         127.0.0.1/8
IP4.GATEWAY:                            --
IP6.ADDRESS[1]:                         ::1/128
IP6.GATEWAY:                            --

root@rpi-cm3:/# nmcli c show
NAME   UUID                                  TYPE  DEVICE 
modem  e7482093-2d4c-47fa-b52b-e6e282902453  gsm   --   

root@rpi-cm3:/# nmcli c up modem
Error: Connection activation failed: No suitable device found for this connection (device lo not available because device is strictly unmanaged).

我被困在这里，无法找到有关如何创建连接的信息。

奇怪的是，我无法将 NetworkManager 配置为自动管理 wwan 接口，我使用以下命令添加强制它：

nmcli dev set wwan0 managed yes

感谢您的帮助

最好的问候

解决方法

我一直在努力让我的调制解调器工作（我有一个 EM7455B），我终于用这些命令让它工作了（按这个顺序）：

解锁sim（假设'mmcli -L'给你'0'，在'-m'上使用这个）

• sudo mmcli -m 0 --sim=0 --pin=your_pin_here

这将允许您启用调制解调器：

• sudo mmcli -m 0 -e

然后连接：

• sudo mmcli -m 0 --simple-connect="apn=your_apn_here"

验证

• sudo mmcli -b 0