【发布时间】：2021-05-02 08:07:28
【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，我可以将调制解调器连接到网络上，但无法创建连接并调出界面。
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, 3g, 4g; preferred: none
--------------------------------
Bands | supported: egsm, dcs, utran-1, utran-8, eutran-1, eutran-3, eutran-7,
| eutran-8, eutran-20
| current: egsm, dcs, utran-1, 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。
奇怪的是我无法配置 NetworkManager 来自动管理 wwan 接口，我用命令添加强制它：
nmcli dev set wwan0 managed yes
感谢您的帮助
最好的问候
【问题讨论】：
-
也许这会有所帮助 (techship.com/faq/…)。你找到解决办法了吗？我也有同样的问题。
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您好，感谢您的评论。我联系了调制解调器的供应商，通过在 MBIM 中进行设置，它走得更远。 NetworkManager 尝试创建连接，但失败： NetworkManager[1072]:
[1622112464.7415] modem-broadband[cdc-wdm1]: failed to connect modem: Failure /// NetworkManager[1072]: [1622112464.7416 ] device (cdc-wdm1): state change: prepare -> failed (reason 'unknown', sys-iface-state: 'managed') /// NetworkManager[1072]: [1622112464.7444] device (cdc-wdm1 ): 激活：连接“LE910”失败 -
我在类似的设置上使用 Sierra Wireless MC7455 调制解调器（带有调制解调器管理器和网络管理器的 Yocto Dunfell 的 Linux 嵌入式系统），我没有任何问题。
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我有完全相同的设置（Yocto Dunfell，MM 和 NM），除了调制解调器是 Telit LE910。
标签： embedded-linux modem networkmanager