我正在尝试在嵌入式 Linux 系统上使用 ModemManager，该系统在没有网络管理器和 udev 的情况下运行。目标是使用 D-Link 的 DWM-222 USB 调制解调器 (4G/LTE) 建立有效的互联网连接。
我已经安装了相关的驱动程序，usb_modeswitch ver 2.5.2 和 ModemManager ver 1.12.6。我相信模式开关工作正常。请参阅下面的输出（注意 wwan0 和 cdc-wdm0 设备）。
-sh-4.4# usb_modeswitch -c /etc/usb_modeswitch.conf
Look for target devices ...
No devices in target mode or class found
Look for default devices ...
Found devices in default mode (1)
Access device 002 on bus 001
Get the current device configuration ...
Current configuration number is 1
Use interface number 0
with class 8
Use endpoints 0x01 (out) and 0x81 (in)
Sending standard EJECT sequence
Looking for active drivers ...
sd 1:0:0:0: [sdb] Synchronizing SCSI cache
sd 1:0:0:0: [sdb] Synchronize Cache(10) failed: Result: hostbyte=0x00 driverbyte=0x08
sd 1:0:0:0: [sdb] Sense Key : 0x5 [current]
sd 1:0:0:0: [sdb] ASC=0x20 ASCQ=0x0
OK, driver detached
Set up interface 0
Use endpoint 0x01 for message sending ...
Trying to send message 1 to endpoint 0x01 ...
OK, message successfully sent
Read the response to message 1 (CSW) ...
Response successfully read (13 bytes), status 0
Trying to send message 2 to endpoint 0x01 ...
OK, message successfully sent
Read the response to message 2 (CSW) ...
Response successfully read (13 bytes), status 0
Trying to send message 3 to endpoint 0x01 ...
OK, message successfully sent
Read the response to message 3 (CSW) ...
Response successfully read (13 bytes), status 1
Trying to send message 4 to endpoint 0x01 ...
OK, message successfully sent
Read the response to message 4 (CSW) ...
Response successfully read (13 bytes), status 0
Reset response endpoint 0x81
Reset message endpoint 0x01
Mdev usbhandle script: MDEV = sdb, ACTION = remove, DEVTYPE = disk
-> Run lsusb to note any changes. Bye!
usb 1-1: USB disconnect, device number 2
usb 1-1: new high-speed USB device number 3 using atmel-ehci
usb 1-1: New USB device found, idVendor=2001, idProduct=7e35, bcdDevice= 2.28
usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1: Product: Mobile Connect
usb 1-1: Manufacturer: Mobile Connect
usb 1-1: SerialNumber: 0123456789ABCDEF
option 1-1:1.0: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0
option 1-1:1.1: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
option 1-1:1.2: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2
option 1-1:1.3: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB3
qmi_wwan 1-1:1.4: cdc-wdm0: USB WDM device
qmi_wwan 1-1:1.4 wwan0: register 'qmi_wwan' at usb-700000.ehci-1, WWAN/QMI device, 9e:c7:04:ff:3d:dd
在模式切换之后，我做了以下事情：
- 我已将文件org.freedesktop.ModemManager1.service放入/usr/share/dbus-1/system-services/以及/etc/dbus-1/system.d/中。
- 我还将所有接口（xml 文件）放入/usr/share/dbus-1/interfaces/目录中。
- 我已经将.rules文件放在/lib/udev/rules.d/中（再次注意，系统没有安装 udev。它使用它的表亲 mdev）。
在这样做并尝试通过 ModemManager 使用 D-Link 调制解调器后，我被两个问题阻止了。
问题 NR。1
第一个问题是 ModemManager 无法获取 'org.freedesktop.ModemManager1' 服务名称。请参阅下面的ModemManager --debug的输出。
-sh-4.4# ModemManager --debug
ModemManager[1624]: <info> [1596559087.074342] ModemManager (version 1.12.6) starting in system bus...
ModemManager[1624]: <debug> [1596559087.148077] Bus acquired, creating manager...
(ModemManager:1624): GLib-GObject-CRITICAL **: 18:38:07.158: g_object_new_is_valid_property: object class 'MMBaseManager' has no property named 'version'
(ModemManager:1624): GLib-GObject-WARNING **: 18:38:07.165: gsignal.c:2523: signal 'handle-inhibit-device' is invalid for instance '0x13e968' of type 'MMBaseManager'
ModemManager[1624]: <debug> [1596559087.167971] [filter] created
ModemManager[1624]: <debug> [1596559087.170063] [filter] explicit whitelist: yes
ModemManager[1624]: <debug> [1596559087.171917] [filter] explicit blacklist: yes
ModemManager[1624]: <debug> [1596559087.172979] [filter] plugin whitelist: no
ModemManager[1624]: <debug> [1596559087.174047] [filter] virtual devices forbidden: yes
ModemManager[1624]: <debug> [1596559087.174798] [filter] net devices allowed: yes
ModemManager[1624]: <debug> [1596559087.175558] [filter] cdc-wdm devices allowed: yes
ModemManager[1624]: <debug> [1596559087.176313] [filter] tty devices:
ModemManager[1624]: <debug> [1596559087.177055] [filter] blacklist applied: yes
ModemManager[1624]: <debug> [1596559087.177818] [filter] manual scan only applied: yes
ModemManager[1624]: <debug> [1596559087.178574] [filter] platform driver check: yes
ModemManager[1624]: <debug> [1596559087.179331] [filter] driver check: no
ModemManager[1624]: <debug> [1596559087.180088] [filter] cdc-acm interface check: no
ModemManager[1624]: <debug> [1596559087.184859] [filter] with net check: no
ModemManager[1624]: <debug> [1596559087.186606] [filter] default: allowed
ModemManager[1624]: <debug> [1596559087.189627] [plugin manager] looking for plugins in '/usr/lib/ModemManager'
ModemManager[1624]: <debug> [1596559087.197523] [plugin manager] loaded shared 'Novatel' utils from '/usr/lib/ModemManager/libmm-shared-novatel.so'
ModemManager[1624]: <debug> [1596559087.202468] [plugin manager] loaded shared 'Option' utils from '/usr/lib/ModemManager/libmm-shared-option.so'
ModemManager[1624]: <warn> [1596559087.209422] [plugin manager] could not load shared '/usr/lib/ModemManager/libmm-shared-xmm.so': /usr/lib/ModemManager/libmm-shared-xmm.so: undefined symbol: mm_common_band_is_gsm
ModemManager[1624]: <debug> [1596559087.217541] [plugin manager] loaded shared 'Sierra' utils from '/usr/lib/ModemManager/libmm-shared-sierra.so'
...
ModemManager[1624]: <debug> [1596559087.465496] [plugin manager] loaded plugin 'Cinterion' from '/usr/lib/ModemManager/libmm-plugin-cinterion.so'
ModemManager[1624]: <debug> [1596559087.467579] [plugin manager] successfully loaded 28 plugins
ModemManager[1624]: <warn> [1596559087.478888] Could not acquire the 'org.freedesktop.ModemManager1' service name
ModemManager[1624]: <debug> [1596559087.479533] Stopping connection in object manager server
ModemManager[1624]: <info> [1596559087.501334] ModemManager is shut down
注意 dbus 守护进程正在运行：
-sh-4.4# ps -a | grep dbus
1613 dbus dbus-daemon --system
在某一时刻，ModemManager 能够获得该服务。老实说，我尝试了很多东西，但我不知道有什么帮助。无论如何，当它工作时，出现了第二个问题（如下所述），在尝试解决这个问题时，我搞砸了帮助 ModemManager 获得“org.freedesktop.ModemManager1”服务名称的任何东西。我已经尝试在新系统上进行全新安装，但又遇到了上述问题。
（我有一种预感，让事情正常工作的是 dbus-daemon 版本和 ModemManager 版本的正确组合。有时我使用过 dbus 版本 1.8.10 和 1.12.16，而对于 ModemManager，我已经尝试过 1.8 .0 和 1.12.6。）
问题 NR。2
在上述问题不存在的短暂时间内，出现了第二个问题。ModemManager 运行良好。至少我是这么认为的。请参阅下面的 ModemManager --debug 的输出。请注意，此时我一直在使用 ModemManager 1.8.0。
ModemManager[2165]: <info> [1596547145.308786] ModemManager (version 1.8.0) starting in system bus...
ModemManager[2165]: <debug> [1596547145.394258] Bus acquired, creating manager...
ModemManager[2165]: <debug> [1596547145.404034] [filter] created
ModemManager[2165]: <debug> [1596547145.413016] [filter] explicit whitelist: yes
ModemManager[2165]: <debug> [1596547145.415615] [filter] virtual devices forbidden: yes
ModemManager[2165]: <debug> [1596547145.417519] [filter] net devices allowed: yes
ModemManager[2165]: <debug> [1596547145.419265] [filter] cdc-wdm devices allowed: yes
ModemManager[2165]: <debug> [1596547145.421282] [filter] tty devices:
ModemManager[2165]: <debug> [1596547145.423055] [filter] blacklist applied: yes
ModemManager[2165]: <debug> [1596547145.424980] [filter] manual scan only applied: yes
ModemManager[2165]: <debug> [1596547145.427060] [filter] platform driver check: yes
ModemManager[2165]: <debug> [1596547145.428854] [filter] driver check: no
ModemManager[2165]: <debug> [1596547145.430350] [filter] cdc-acm interface check: no
ModemManager[2165]: <debug> [1596547145.431968] [filter] with net check: no
ModemManager[2165]: <debug> [1596547145.433453] [filter] default: allowed
ModemManager[2165]: <debug> [1596547145.437694] [plugin manager] looking for plugins in '/usr/lib/ModemManager'
ModemManager[2165]: <debug> [1596547145.450686] [plugin manager] loaded plugin 'Cinterion'
ModemManager[2165]: <debug> [1596547145.456470] [plugin manager] loaded plugin 'Pantech'
ModemManager[2165]: <debug> [1596547145.463000] [plugin manager] loaded plugin 'Ericsson MBM'
ModemManager[2165]: <debug> [1596547145.468429] [plugin manager] loaded plugin 'AnyDATA'
ModemManager[2165]: <debug> [1596547145.473753] [plugin manager] loaded plugin 'Sierra'
ModemManager[2165]: <debug> [1596547145.479183] [plugin manager] loaded plugin 'Via CBP7'
ModemManager[2165]: <debug> [1596547145.484214] [plugin manager] loaded plugin 'Haier'
ModemManager[2165]: <debug> [1596547145.491056] [plugin manager] loaded plugin 'ZTE'
ModemManager[2165]: <debug> [1596547145.497882] [plugin manager] loaded plugin 'Option High-Speed'
ModemManager[2165]: <debug> [1596547145.502716] [plugin manager] loaded plugin 'Novatel LTE'
ModemManager[2165]: <debug> [1596547145.508871] [plugin manager] loaded plugin 'Nokia'
ModemManager[2165]: <debug> [1596547145.516253] [plugin manager] loaded plugin 'Altair LTE'
ModemManager[2165]: <debug> [1596547145.525133] [plugin manager] loaded plugin 'u-blox'
ModemManager[2165]: <debug> [1596547145.532582] [plugin manager] loaded plugin 'Huawei'
ModemManager[2165]: <debug> [1596547145.539040] [plugin manager] loaded plugin 'Thuraya'
ModemManager[2165]: <debug> [1596547145.544230] [plugin manager] loaded plugin 'Generic'
ModemManager[2165]: <debug> [1596547145.549293] [plugin manager] loaded plugin 'SimTech'
ModemManager[2165]: <debug> [1596547145.556424] [plugin manager] loaded plugin 'Dell'
ModemManager[2165]: <debug> [1596547145.562814] [plugin manager] loaded plugin 'Linktop'
ModemManager[2165]: <debug> [1596547145.569637] [plugin manager] loaded plugin 'Nokia (Icera)'
ModemManager[2165]: <debug> [1596547145.576034] [plugin manager] loaded plugin 'Samsung'
ModemManager[2165]: <debug> [1596547145.581402] [plugin manager] loaded plugin 'Motorola'
ModemManager[2165]: <debug> [1596547145.586908] [plugin manager] loaded plugin 'Iridium'
ModemManager[2165]: <debug> [1596547145.592314] [plugin manager] loaded plugin 'X22X'
ModemManager[2165]: <debug> [1596547145.597916] [plugin manager] loaded plugin 'Option'
ModemManager[2165]: <debug> [1596547145.604872] [plugin manager] loaded plugin 'Telit'
ModemManager[2165]: <debug> [1596547145.610360] [plugin manager] loaded plugin 'Quectel'
ModemManager[2165]: <debug> [1596547145.617126] [plugin manager] loaded plugin 'Novatel'
ModemManager[2165]: <debug> [1596547145.622472] [plugin manager] loaded plugin 'Wavecom'
ModemManager[2165]: <debug> [1596547145.629320] [plugin manager] loaded plugin 'Sierra (legacy)'
ModemManager[2165]: <debug> [1596547145.634753] [plugin manager] loaded plugin 'Longcheer'
ModemManager[2165]: <debug> [1596547145.640217] [plugin manager] loaded plugin 'D-Link'
ModemManager[2165]: <debug> [1596547145.645604] [plugin manager] loaded plugin 'MTK'
ModemManager[2165]: <debug> [1596547145.647637] [plugin manager] successfully loaded 33 plugins
ModemManager[2165]: <debug> [1596547145.667580] Service name 'org.freedesktop.ModemManager1' was acquired
由于系统上没有udev，所以我使用以下命令告诉ModemManager连接了一个新的调制解调器：
mmcli --report-kernel-event=action=add,subsystem=net,name=wwan0
这导致 ModemManager 中的以下输出：
ModemManager[2165]: <debug> [1596547145.667580] Service name 'org.freedesktop.ModemManager1' was acquired
ModemManager[2165]: <debug> [1596547149.418458] Kernel event reported:
ModemManager[2165]: <debug> [1596547149.418940] action: add
ModemManager[2165]: <debug> [1596547149.419274] subsystem: net
ModemManager[2165]: <debug> [1596547149.419597] name: wwan0
ModemManager[2165]: <debug> [1596547149.419917] uid: n/a
ModemManager[2165]: <debug> [1596547149.420269] [rules] rules directory set to '/lib/udev/rules.d'...
ModemManager[2165]: <debug> [1596547149.441522] [rules] loading rules from: /lib/udev/rules.d/77-mm-cinterion-port-types.rules
ModemManager[2165]: <debug> [1596547149.447190] [rules] loading rules from: /lib/udev/rules.d/77-mm-dell-port-types.rules
ModemManager[2165]: <debug> [1596547149.450693] [rules] loading rules from: /lib/udev/rules.d/77-mm-dlink-port-types.rules
ModemManager[2165]: <debug> [1596547149.455154] [rules] loading rules from: /lib/udev/rules.d/77-mm-ericsson-mbm.rules
ModemManager[2165]: <debug> [1596547149.471019] [rules] loading rules from: /lib/udev/rules.d/77-mm-haier-port-types.rules
ModemManager[2165]: <debug> [1596547149.474891] [rules] loading rules from: /lib/udev/rules.d/77-mm-huawei-net-port-types.rules
ModemManager[2165]: <debug> [1596547149.479374] [rules] loading rules from: /lib/udev/rules.d/77-mm-longcheer-port-types.rules
ModemManager[2165]: <debug> [1596547149.502946] [rules] loading rules from: /lib/udev/rules.d/77-mm-mtk-port-types.rules
ModemManager[2165]: <debug> [1596547149.510605] [rules] loading rules from: /lib/udev/rules.d/77-mm-nokia-port-types.rules
ModemManager[2165]: <debug> [1596547149.516503] [rules] loading rules from: /lib/udev/rules.d/77-mm-pcmcia-device-blacklist.rules
ModemManager[2165]: <debug> [1596547149.519873] [rules] loading rules from: /lib/udev/rules.d/77-mm-sierra.rules
ModemManager[2165]: <debug> [1596547149.523567] [rules] loading rules from: /lib/udev/rules.d/77-mm-simtech-port-types.rules
ModemManager[2165]: <debug> [1596547149.528589] [rules] loading rules from: /lib/udev/rules.d/77-mm-telit-port-types.rules
ModemManager[2165]: <debug> [1596547149.534333] [rules] loading rules from: /lib/udev/rules.d/77-mm-ublox-port-types.rules
ModemManager[2165]: <debug> [1596547149.541633] [rules] loading rules from: /lib/udev/rules.d/77-mm-usb-device-blacklist.rules
ModemManager[2165]: <debug> [1596547149.557215] [rules] loading rules from: /lib/udev/rules.d/77-mm-usb-serial-adapters-greylist.rules
ModemManager[2165]: <debug> [1596547149.563367] [rules] loading rules from: /lib/udev/rules.d/77-mm-x22x-port-types.rules
ModemManager[2165]: <debug> [1596547149.571845] [rules] loading rules from: /lib/udev/rules.d/77-mm-zte-port-types.rules
ModemManager[2165]: <debug> [1596547149.596309] [rules] loading rules from: /lib/udev/rules.d/80-mm-candidate.rules
ModemManager[2165]: <debug> [1596547149.600336] [rules] 658 loaded
ModemManager[2165]: <debug> [1596547149.603486] (net/wwan0) preloading contents and properties...
ModemManager[2165]: <debug> [1596547149.609474] (net/wwan0) sysfs path: /sys/devices/platform/ahb/700000.ehci/usb1/1-1/1-1:1.4/net/wwan0
ModemManager[2165]: <debug> [1596547149.613092] (net/wwan0) interface sysfs path: /sys/devices/platform/ahb/700000.ehci/usb1/1-1/1-1:1.4
ModemManager[2165]: <debug> [1596547149.615719] (net/wwan0) interface class: 0xff
ModemManager[2165]: <debug> [1596547149.617017] (net/wwan0) interface subclass: 0xff
ModemManager[2165]: <debug> [1596547149.618141] (net/wwan0) interface protocol: 0xff
ModemManager[2165]: <debug> [1596547149.619283] (net/wwan0) interface number (ID_USB_INTERFACE_NUM): 0x04
ModemManager[2165]: <debug> [1596547149.620292] (net/wwan0) physdev sysfs path: /sys/devices/platform/ahb/700000.ehci/usb1/1-1
ModemManager[2165]: <debug> [1596547149.621393] (net/wwan0) manufacturer (ID_VENDOR): Mobile Connect
ModemManager[2165]: <debug> [1596547149.622621] (net/wwan0) product (ID_MODEL): Mobile Connect
ModemManager[2165]: <debug> [1596547149.640091] (net/wwan0) driver: qmi_wwan
ModemManager[2165]: <debug> [1596547149.641160] (net/wwan0) vid (ID_VENDOR_ID): 0x2001
ModemManager[2165]: <debug> [1596547149.642351] (net/wwan0) pid (ID_MODEL_ID): 0x7e35
ModemManager[2165]: <debug> [1596547149.643761] (net/wwan0) subsystem: /sys/bus
ModemManager[2165]: <debug> [1596547149.644740] (net/wwan0) property added: .MM_USBIFNUM=04
ModemManager[2165]: <debug> [1596547149.646207] (net/wwan0) property added: .MM_USBIFNUM=04
ModemManager[2165]: <debug> [1596547149.657478] (net/wwan0) property added: ID_MM_CANDIDATE=1
ModemManager[2165]: <debug> [1596547149.659750] (net/wwan0): adding device at sysfs path: /sys/devices/platform/ahb/700000.ehci/usb1/1-1/1-1:1.4/net/wwan0
ModemManager[2165]: <debug> [1596547149.661775] [filter] (net/wwan0) port allowed: net device
ModemManager[2165]: <debug> [1596547149.663927] (net/wwan0): first port in device /sys/devices/platform/ahb/700000.ehci/usb1/1-1
ModemManager[2165]: <debug> [1596547149.667145] [plugin manager] task 0: new support task for device: /sys/devices/platform/ahb/700000.ehci/usb1/1-1
ModemManager[2165]: <debug> [1596547149.669267] [plugin manager] task 0: port grabbed: wwan0
ModemManager[2165]: <debug> [1596547149.670108] [plugin manager] task 0,wwan0: new support task for port
ModemManager[2165]: <debug> [1596547149.676406] [plugin manager) task 0,wwan0: deferred until min wait time elapsed
ModemManager[2165]: <debug> [1596547151.170118] [plugin manager] task 0: min wait time elapsed
ModemManager[2165]: <debug> [1596547151.170801] (Cinterion) [wwan0] filtered by vendor/product IDs
ModemManager[2165]: <debug> [1596547151.174517] (Pantech) [wwan0] filtered by vendor/product IDs
ModemManager[2165]: <debug> [1596547151.176674] (Ericsson MBM) [wwan0] filtered by implicit QMI driver
ModemManager[2165]: <debug> [1596547151.178797] (AnyDATA) [wwan0] filtered by vendor/product IDs
ModemManager[2165]: <debug> [1596547151.180614] (Sierra) [wwan0] filtered by vendor/product IDs
ModemManager[2165]: <debug> [1596547151.182584] (Via CBP7) [wwan0] filtered by subsystem
ModemManager[2165]: <debug> [1596547151.184390] (Haier) [wwan0] filtered by subsystem
ModemManager[2165]: <debug> [1596547151.186707] (ZTE) [wwan0] filtered by vendor/product IDs
ModemManager[2165]: <debug> [1596547151.188246] (Option High-Speed) [wwan0] filtered by drivers
ModemManager[2165]: <debug> [1596547151.189934] (Novatel LTE) [wwan0] filtered by implicit QMI driver
ModemManager[2165]: <debug> [1596547151.191523] (Nokia) [wwan0] filtered by subsystem
ModemManager[2165]: <debug> [1596547151.193184] (Altair LTE) [wwan0] filtered by implicit QMI driver
ModemManager[2165]: <debug> [1596547151.194567] (u-blox) [wwan0] filtered by implicit QMI driver
ModemManager[2165]: <debug> [1596547151.195064] (Huawei) [wwan0] filtered by vendor/product IDs
ModemManager[2165]: <debug> [1596547151.195917] (Thuraya) [wwan0] filtered by subsystem
ModemManager[2165]: <debug> [1596547151.196415] (SimTech) [wwan0] filtered by vendor/product IDs
ModemManager[2165]: <debug> [1596547151.196881] (Dell) [wwan0] filtered by vendor/product IDs
ModemManager[2165]: <debug> [1596547151.197335] (Linktop) [wwan0] filtered by subsystem
ModemManager[2165]: <debug> [1596547151.197796] (Nokia (Icera)) [wwan0] filtered by implicit QMI driver
ModemManager[2165]: <debug> [1596547151.198447] (Samsung) [wwan0] filtered by implicit QMI driver
ModemManager[2165]: <debug> [1596547151.201254] (Motorola) [wwan0] filtered by subsystem
ModemManager[2165]: <debug> [1596547151.202047] (Iridium) [wwan0] filtered by subsystem
ModemManager[2165]: <debug> [1596547151.211614] (X22X) [wwan0] filtered by vendor/product IDs
ModemManager[2165]: <debug> [1596547151.213434] (Option) [wwan0] filtered by subsystem
ModemManager[2165]: <debug> [1596547151.215451] (Telit) [wwan0] filtered by vendor/product IDs
ModemManager[2165]: <debug> [1596547151.217371] (Quectel) [wwan0] filtered by vendor/product IDs
ModemManager[2165]: <debug> [1596547151.219443] (Novatel) [wwan0] filtered by vendor/product IDs
ModemManager[2165]: <debug> [1596547151.220174] (Wavecom) [wwan0] filtered by subsystem
ModemManager[2165]: <debug> [1596547151.220898] (Sierra (legacy)) [wwan0] filtered by drivers
ModemManager[2165]: <debug> [1596547151.221617] (Longcheer) [wwan0] filtered by subsystem
ModemManager[2165]: <debug> [1596547151.222430] [plugin manager] task 0,wwan0: found '2' plugins to try
ModemManager[2165]: <debug> [1596547151.223150] [plugin manager] task 0,wwan0: will try with plugin 'D-Link'
ModemManager[2165]: <debug> [1596547151.223913] [plugin manager] task 0,wwan0: will try with plugin 'Generic'
ModemManager[2165]: <debug> [1596547151.224725] [plugin manager) task 0,wwan0: started
ModemManager[2165]: <debug> [1596547151.225446] [plugin manager] task 0,wwan0: checking with plugin 'D-Link'
ModemManager[2165]: <debug> [1596547151.234264] (D-Link) [wwan0] probing deferred until result suggested
ModemManager[2165]: <debug> [1596547151.235430] [plugin manager] task 0,wwan0: deferring support check until result suggested
ModemManager[2165]: <debug> [1596547152.169553] [plugin manager] task 0: min probing time elapsed
ModemManager[2165]: <debug> [1596547152.170067] [plugin Manager] task 0: still 1 running probes (0 active): wwan0
ModemManager[2165]: <debug> [1596547152.170504] [plugin manager] task 0: no active tasks to probe
ModemManager[2165]: <debug> [1596547152.173129] [plugin manager] task 0,wwan0: deferred task completed, no suggested plugin
ModemManager[2165]: <debug> [1596547152.175214] [plugin manager] task 0,wwan0: finished in '2.505127' seconds
ModemManager[2165]: <debug> [1596547152.177671] [plugin manager] task 0,wwan0: not supported by any plugin
ModemManager[2165]: <debug> [1596547152.179248] [device /sys/devices/platform/ahb/700000.ehci/usb1/1-1] fully ignoring port 'net/wwan0' from now on
ModemManager[2165]: <debug> [1596547152.180164] [plugin manager] task 0: no more ports to probe
ModemManager[2165]: <debug> [1596547152.180953] [plugin manager] task 0: finished in '2.513838' seconds
ModemManager[2165]: <info> [1596547152.181979] Couldn't check support for device '/sys/devices/platform/ahb/700000.ehci/usb1/1-1': not supported by any plugin
不支持调制解调器。真的可以这样吗？ModemManager 的 D-Link 插件存在，它提到了 DWM-222。
然后我尝试更新 ModemManager（从 1.8.0 到 1.12.6），仅将新插件复制到我拥有的原始 ModemManager 版本，当这没有帮助时，我更新了整个 ModemManager 包，尝试了这个并在某些时候，我被第一个问题困住了——ModemManager 无法获取“org.freedesktop.ModemManager1”服务名称。
任何人都可以提供任何指导如何进行吗？在哪里看，尝试什么？任何投入将不胜感激。
谢谢。