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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 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 自动管理 wwan 接口，我添加了以下命令来强制它：
nmcli dev set wwan0 managed yes
感谢您的帮助
此致
答案1
有趣的是，今天晚上我正在使用类似的配置（在带有 Telit LE910 NA 的基于 am335x 的嵌入式系统上使用 yocto dunfell）。我还无法让 cdc_ncm (wwan0) 上下文正常工作，但我可以使用 ppp 来启动网络
nmcli c add type gsm ifname '*' con-name {connectionname} apn {apnname}
请注意，这需要向网络管理器添加 ppp 支持，因为它是不在默认包中。为此，我们需要覆盖。
创造networkmanager_%.bbappend：
# Based on https://github.com/digi-embedded/meta-digi/blob/morty/meta-digi-dey/recipes-connectivity/networkmanager/networkmanager_%25.bbappend
FILESEXTRAPATHS_prepend := "${THISDIR}/${BPN}:"
SRC_URI += " \
file://att.nmconnection \
"
# Adjust other compile time options
PACKAGECONFIG_append = " gnutls modemmanager ppp"
do_install_append() {
install -m 0600 ${WORKDIR}/att.nmconnection ${D}${sysconfdir}/NetworkManager/system-connections/
}
然后将您的连接信息放入例如att.nmconnection。将 uuid 替换为新的 uuid，然后输入您的 apn 名称。
[connection]
id=att
uuid=88cd70ea-6501-11eb-ae93-0242ac130002
type=gsm
permissions=
autoconnect=true
[gsm]
apn=NXTGENPHONE
[ipv4]
dns-search=
method=auto
[proxy]
如果调制解调器在启动时可见，则应通过 ppp 自动连接。
ifconfig ppp0
ppp0 Link encap:Point-to-Point Protocol
inet addr:10.55.27.182 P-t-P:10.55.27.182 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1428 Metric:1
RX packets:65110 errors:0 dropped:0 overruns:0 frame:0
TX packets:24635 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:3
RX bytes:53163224 (50.7 MiB) TX bytes:1670291 (1.5 MiB)
我也想使用 cdc_ncm 接口，但我还无法让它工作。驱动程序没问题，但它没有与调制解调器正确连接，无法从运营商处获取地址。
ifconfig wwan0
wwan0 Link encap:Ethernet HWaddr 00:00:11:12:13:14
BROADCAST NOARP MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
也许我们可以一起解决这个问题。