Networking

戴爾無線 5570 HSPA+ 移動寬頻卡的問題

  • September 26, 2016

我有一個新的 Dell Latitude e7440 和一個 Dell Wireless 5570 HSPA+ 移動寬頻卡。我無法讓寬頻卡工作。

我可以看到卡片：

# lshw
 ....
 *-network DISABLED
      description: Ethernet interface
      physical id: 1
      logical name: wwan0
      serial: 46:51:4c:75:9d:ad
      capabilities: ethernet physical
      configuration: broadcast=yes driver=cdc_mbim driverversion=22-Aug-2005 firmware=CDC MBIM link=no multicast=yes

我可以擺脫 DISABLED 文本：

# ifconfig wwan0 up
# ifconfig wwan0
wwan0     Link encap:Ethernet  HWaddr 46:51:4c:75:9d:ad  
         inet6 addr: fe80::4451:4cff:fe75:9dad/64 Scope:Link
         UP BROADCAST RUNNING NOARP MULTICAST  MTU:1500  Metric:1
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0
         TX packets:11 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000 
         RX bytes:0 (0.0 B)  TX bytes:3937 (3.9 KB)
# lshw
 ....
 *-network
      description: Ethernet interface
      physical id: 3
      logical name: wwan0
      serial: 46:51:4c:75:9d:ad
      capabilities: ethernet physical
      configuration: broadcast=yes driver=cdc_mbim driverversion=22-Aug-2005 firmware=CDC MBIM link=yes multicast=yes

但是我不能以任何方式使用該卡。

  • 沒有/dev/ttyUSBx我可以輸入AT命令的地方。
  • 我在網路管理器中看不到移動寬頻連接。
  • 像mbim-network簡單地說與調製解調器的連接失敗的工具

我的戴爾 BIOS 版本是A10，從 BIOS 中我可以看到該卡。它已啟用，從這個角度來看，它不應該有任何問題。如果我需要調試驅動程序，我願意試一試，但我需要一些關於從哪裡開始的指示。任何幫助深表感謝。

下面是調試輸出列表。如果您認為有任何幫助，請在評論中詢問更多資訊。

這是lsusb -v：

# lsusb -v
Bus 002 Device 017: ID 413c:81a3 Dell Computer Corp. 
Device Descriptor:
 bLength                18
 bDescriptorType         1
 bcdUSB               2.00
 bDeviceClass            0 (Defined at Interface level)
 bDeviceSubClass         0 
 bDeviceProtocol         0 
 bMaxPacketSize0        64
 idVendor           0x413c Dell Computer Corp.
 idProduct          0x81a3 
 bcdDevice            0.06
 iManufacturer           1 Sierra Wireless, Incorporated
 iProduct                2 Dell Wireless 5570 HSPA+ (42Mbps) Mobile Broadband Card
 iSerial                 3 
 bNumConfigurations      2
 Configuration Descriptor:
   bLength                 9
   bDescriptorType         2
   wTotalLength          204
   bNumInterfaces          4
   bConfigurationValue     1
   iConfiguration          0 
   bmAttributes         0xe0
     Self Powered
     Remote Wakeup
   MaxPower              500mA
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        2
     bAlternateSetting       0
     bNumEndpoints           3
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass      0 
     bInterfaceProtocol      0 
     iInterface              0 
     ** UNRECOGNIZED:  05 24 00 10 01
     ** UNRECOGNIZED:  05 24 01 00 00
     ** UNRECOGNIZED:  04 24 02 02
     ** UNRECOGNIZED:  05 24 06 00 00
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x82  EP 2 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x000c  1x 12 bytes
       bInterval               9
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x81  EP 1 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x01  EP 1 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               0
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        3
     bAlternateSetting       0
     bNumEndpoints           3
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass      0 
     bInterfaceProtocol      0 
     iInterface              0 
     ** UNRECOGNIZED:  05 24 00 10 01
     ** UNRECOGNIZED:  05 24 01 00 00
     ** UNRECOGNIZED:  04 24 02 02
     ** UNRECOGNIZED:  05 24 06 00 00
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x84  EP 4 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x000c  1x 12 bytes
       bInterval               9
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x83  EP 3 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x02  EP 2 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               0
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        8
     bAlternateSetting       0
     bNumEndpoints           3
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass    255 Vendor Specific Subclass
     bInterfaceProtocol    255 Vendor Specific Protocol
     iInterface              0 
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x86  EP 6 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x000a  1x 10 bytes
       bInterval               9
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x85  EP 5 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x03  EP 3 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               0
       ** UNRECOGNIZED:  2c ff 42 49 53 54 00 01 07 f5 40 f6 00 00 00 00 01 f7 c4 09 02 f8 c4 09 03 f9 88 13 04 fa 10 27 05 fb 10 27 06 fc c4 09 07 fd c4 09
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        0
     bAlternateSetting       0
     bNumEndpoints           2
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass    255 Vendor Specific Subclass
     bInterfaceProtocol    255 Vendor Specific Protocol
     iInterface              0 
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x87  EP 7 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x04  EP 4 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               0
 Configuration Descriptor:
   bLength                 9
   bDescriptorType         2
   wTotalLength           82
   bNumInterfaces          2
   bConfigurationValue     2
   iConfiguration          0 
   bmAttributes         0xe0
     Self Powered
     Remote Wakeup
   MaxPower              500mA
   Interface Association:
     bLength                 8
     bDescriptorType        11
     bFirstInterface        12
     bInterfaceCount         2
     bFunctionClass          2 Communications
     bFunctionSubClass      14 
     bFunctionProtocol       0 
     iFunction               0 
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber       12
     bAlternateSetting       0
     bNumEndpoints           1
     bInterfaceClass         2 Communications
     bInterfaceSubClass     14 
     bInterfaceProtocol      0 
     iInterface              0 
     CDC Header:
       bcdCDC               1.10
     CDC MBIM:
       bcdMBIMVersion       1.00
       wMaxControlMessage   4096
       bNumberFilters       16
       bMaxFilterSize       128
       wMaxSegmentSize      4064
       bmNetworkCapabilities 0x20
         8-byte ntb input size
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x82  EP 2 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               9
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber       13
     bAlternateSetting       0
     bNumEndpoints           0
     bInterfaceClass        10 CDC Data
     bInterfaceSubClass      0 Unused
     bInterfaceProtocol      2 
     iInterface              0 
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber       13
     bAlternateSetting       1
     bNumEndpoints           2
     bInterfaceClass        10 CDC Data
     bInterfaceSubClass      0 Unused
     bInterfaceProtocol      2 
     iInterface              0 
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x81  EP 1 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x01  EP 1 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               0
Device Qualifier (for other device speed):
 bLength                10
 bDescriptorType         6
 bcdUSB               2.00
 bDeviceClass            0 (Defined at Interface level)
 bDeviceSubClass         0 
 bDeviceProtocol         0 
 bMaxPacketSize0        64
 bNumConfigurations      2
Device Status:     0x0000
 (Bus Powered)

調製解調器的usb-devices輸出：

# usb-devices
T:  Bus=02 Lev=01 Prnt=01 Port=06 Cnt=02 Dev#= 17 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  2
P:  Vendor=413c ProdID=81a3 Rev=00.06
S:  Manufacturer=Sierra Wireless, Incorporated
S:  Product=Dell Wireless 5570 HSPA+ (42Mbps) Mobile Broadband Card
C:  #Ifs= 2 Cfg#= 2 Atr=e0 MxPwr=500mA
/usr/bin/usb-devices: line 79: printf: c: invalid number
I:  If#= 0 Alt= 0 #EPs= 1 Cls=02(commc) Sub=0e Prot=00 Driver=cdc_mbim
/usr/bin/usb-devices: line 79: printf: d: invalid number
I:  If#= 0 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=02 Driver=cdc_mbim

這是rfkill-資訊：

# cat /sys/kernel/debug/dell_laptop/rfkill
status: 0x1015D
Bit 0 : Hardware switch supported:   1
Bit 1 : Wifi locator supported:      0
Bit 2 : Wifi is supported:           1
Bit 3 : Bluetooth is supported:      1
Bit 4 : WWAN is supported:           1
Bit 5 : Wireless keyboard supported: 0
Bit 8 : Wifi is installed:           1
Bit 9 : Bluetooth is installed:      0
Bit 10: WWAN is installed:           0
Bit 16: Hardware switch is on:       1
Bit 17: Wifi is blocked:             0
Bit 18: Bluetooth is blocked:        0
Bit 19: WWAN is blocked:             0

hwswitch_state: 0x1F
Bit 0 : Wifi controlled by switch:      1
Bit 1 : Bluetooth controlled by switch: 1
Bit 2 : WWAN controlled by switch:      1
Bit 7 : Wireless switch config locked:  0
Bit 8 : Wifi locator enabled:           0
Bit 15: Wifi locator setting locked:    0

這是您dmesg在啟用設備時可以看到的內容：

[ 2101.897753] usb 2-7: new high-speed USB device number 17 using xhci_hcd
[ 2102.026467] usb 2-7: config 1 has an invalid interface number: 8 but max is 3
[ 2102.026480] usb 2-7: config 1 has no interface number 1
[ 2102.026926] usb 2-7: config 2 has an invalid interface number: 12 but max is 1
[ 2102.026930] usb 2-7: config 2 has an invalid interface number: 13 but max is 1
[ 2102.026941] usb 2-7: config 2 has an invalid interface number: 13 but max is 1
[ 2102.026942] usb 2-7: config 2 has no interface number 0
[ 2102.026943] usb 2-7: config 2 has no interface number 1
[ 2102.027618] usb 2-7: New USB device found, idVendor=413c, idProduct=81a3
[ 2102.027621] usb 2-7: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 2102.027623] usb 2-7: Product: Dell Wireless 5570 HSPA+ (42Mbps) Mobile Broadband Card
[ 2102.027624] usb 2-7: Manufacturer: Sierra Wireless, Incorporated
[ 2102.029821] cdc_mbim 2-7:2.12: cdc-wdm0: USB WDM device
[ 2102.029954] cdc_mbim 2-7:2.12 wwan0: register 'cdc_mbim' at usb-0000:00:14.0-7, CDC MBIM, 46:51:4c:75:9d:ad

nmcli輸出：

# nmcli nm status
RUNNING         STATE           WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN      
running         connected       enabled         enabled    enabled         enabled

這是我嘗試開始時得到的mbim-network：

# mbim-network /dev/cdc-wdm0 start
Querying subscriber ready status 'mbimcli -d /dev/cdc-wdm0 --query-subscriber-ready-status --no-close'...
error: couldn't open the MbimDevice: Failure

Querying registration state 'mbimcli -d /dev/cdc-wdm0 --query-registration-state --no-open= --no-close'...
error: invalid transaction ID specified: 

Attaching to packet service with 'mbimcli -d /dev/cdc-wdm0 --attach-packet-service --no-open= --no-close'...
error: invalid transaction ID specified: 
Starting network with 'mbimcli -d /dev/cdc-wdm0 --connect= --no-open= --no-close'...
error: invalid transaction ID specified: 
Network start failed

驅動程序應該沒問題，從modprobe輸出中獲取供應商和產品 ID 組合：

# modprobe -c | grep -i 413c.*81a3
alias usb:v413Cp81A3d*dc*dsc*dp*ic*isc*ip*in00* qcserial
alias usb:v413Cp81A3d*dc*dsc*dp*ic*isc*ip*in02* qcserial
alias usb:v413Cp81A3d*dc*dsc*dp*ic*isc*ip*in03* qcserial
alias usb:v413Cp81A3d*dc*dsc*dp*ic*isc*ip*in08* qmi_wwan

這是我的 Linux 版本。由於多頭擴展塢問題，我正在執行修改後的核心，但是這個調製解調器問題同樣出現在 3.13 核心上，這是我安裝 Ubuntu 14.04 時的預設設置。

# uname -a
Linux slartibartfast 3.15.0-rc8+ #5 SMP Mon Jul 21 14:18:58 EEST 2014 x86_64 x86_64 x86_64 GNU/Linux

使用libqmiand qmicli，我與調製解調器進行了一些互動，但仍然有一些相當混亂的錯誤消息。我還沒有時間進一步研究這個問題。

$ sudo qmicli -d /dev/cdc-wdm0 --verbose --wds-start-network= --client-no-release-cid
[27 elo 2014, 12:41:16] [Debug] QMI Device at '/dev/cdc-wdm0' ready
[27 elo 2014, 12:41:16] [Debug] [/dev/cdc-wdm0] Assuming service 'wds' is supported...
[27 elo 2014, 12:41:16] [Debug] [/dev/cdc-wdm0] Allocating new client ID...
[27 elo 2014, 12:41:16] [Debug] [/dev/cdc-wdm0] Sent message...
<<<<<< RAW:
<<<<<<   length = 16
<<<<<<   data   = 01:0F:00:00:00:00:00:01:22:00:04:00:01:01:00:01

[27 elo 2014, 12:41:16] [Debug] [/dev/cdc-wdm0] Sent message (translated)...
<<<<<< QMUX:
<<<<<<   length  = 15
<<<<<<   flags   = 0x00
<<<<<<   service = "ctl"
<<<<<<   client  = 0
<<<<<< QMI:
<<<<<<   flags       = "none"
<<<<<<   transaction = 1
<<<<<<   tlv_length  = 4
<<<<<<   message     = "Allocate CID" (0x0022)
<<<<<< TLV:
<<<<<<   type       = "Service" (0x01)
<<<<<<   length     = 1
<<<<<<   value      = 01
<<<<<<   translated = wds

[27 elo 2014, 12:41:16] [Debug] [/dev/cdc-wdm0] Received message...
>>>>>> RAW:
>>>>>>   length = 24
>>>>>>   data   = 01:17:00:80:00:00:01:01:22:00:0C:00:02:04:00:00:00:00:00:01:02:00:01:08

[27 elo 2014, 12:41:16] [Debug] [/dev/cdc-wdm0] Received message (translated)...
>>>>>> QMUX:
>>>>>>   length  = 23
>>>>>>   flags   = 0x80
>>>>>>   service = "ctl"
>>>>>>   client  = 0
>>>>>> QMI:
>>>>>>   flags       = "response"
>>>>>>   transaction = 1
>>>>>>   tlv_length  = 12
>>>>>>   message     = "Allocate CID" (0x0022)
>>>>>> TLV:
>>>>>>   type       = "Result" (0x02)
>>>>>>   length     = 4
>>>>>>   value      = 00:00:00:00
>>>>>>   translated = SUCCESS
>>>>>> TLV:
>>>>>>   type       = "Allocation Info" (0x01)
>>>>>>   length     = 2
>>>>>>   value      = 01:08
>>>>>>   translated = [ service = 'wds' cid = '8' ]

[27 elo 2014, 12:41:16] [Debug] [/dev/cdc-wdm0] Registered 'wds' (version unknown) client with ID '8'
[27 elo 2014, 12:41:16] [Debug] Asynchronously starting network...
[27 elo 2014, 12:41:16] [Debug] [/dev/cdc-wdm0] Sent message...
<<<<<< RAW:
<<<<<<   length = 13
<<<<<<   data   = 01:0C:00:00:01:08:00:01:00:20:00:00:00

[27 elo 2014, 12:41:16] [Debug] [/dev/cdc-wdm0] Sent message (translated)...
<<<<<< QMUX:
<<<<<<   length  = 12
<<<<<<   flags   = 0x00
<<<<<<   service = "wds"
<<<<<<   client  = 8
<<<<<< QMI:
<<<<<<   flags       = "none"
<<<<<<   transaction = 1
<<<<<<   tlv_length  = 0
<<<<<<   message     = "Start Network" (0x0020)

[27 elo 2014, 12:41:16] [Debug] [/dev/cdc-wdm0] Received message...
>>>>>> RAW:
>>>>>>   length = 32
>>>>>>   data   = 01:1F:00:80:01:08:02:01:00:20:00:13:00:02:04:00:01:00:0E:00:10:02:00:03:00:11:04:00:03:00:D1:07

[27 elo 2014, 12:41:16] [Debug] [/dev/cdc-wdm0] Received message (translated)...
>>>>>> QMUX:
>>>>>>   length  = 31
>>>>>>   flags   = 0x80
>>>>>>   service = "wds"
>>>>>>   client  = 8
>>>>>> QMI:
>>>>>>   flags       = "response"
>>>>>>   transaction = 1
>>>>>>   tlv_length  = 19
>>>>>>   message     = "Start Network" (0x0020)
>>>>>> TLV:
>>>>>>   type       = "Result" (0x02)
>>>>>>   length     = 4
>>>>>>   value      = 01:00:0E:00
>>>>>>   translated = FAILURE: CallFailed
>>>>>> TLV:
>>>>>>   type       = "Call End Reason" (0x10)
>>>>>>   length     = 2
>>>>>>   value      = 03:00
>>>>>>   translated = generic-no-service
>>>>>> TLV:
>>>>>>   type       = "Verbose Call End Reason" (0x11)
>>>>>>   length     = 4
>>>>>>   value      = 03:00:D1:07
>>>>>>   translated = [ type = 'cm' reason = '2001' ]

error: couldn't start network: QMI protocol error (14): 'CallFailed'
call end reason (3): generic-no-service
verbose call end reason (3,2001): [cm] no-service
[/dev/cdc-wdm0] Client ID not released:
   Service: 'wds'
       CID: '8'
[27 elo 2014, 12:41:16] [Debug] [/dev/cdc-wdm0] Unregistered 'wds' client with ID '8'
[27 elo 2014, 12:41:16] [Debug] Client released

我還可以使用以下方式設置我的 PIN 碼qmcli：

# qmicli --dms-uim-verify-pin=PIN,xxxx -d /dev/cdc-wdm0
[/dev/cdc-wdm0] PIN verified successfully

並獲取一些資訊：

# qmicli -d /dev/cdc-wdm0 --dms-get-manufacturer 
[/dev/cdc-wdm0] Device manufacturer retrieved:
   Manufacturer: 'Sierra Wireless, Incorporated'

# qmicli -d /dev/cdc-wdm0 --dms-get-model
[/dev/cdc-wdm0] Device model retrieved:
   Model: 'MC8805'

# qmicli -d /dev/cdc-wdm0 --dms-get-capabilities
[/dev/cdc-wdm0] Device capabilities retrieved:
   Max TX channel rate: '5742000'
   Max RX channel rate: '42200000'
          Data Service: 'non-simultaneous-cs-ps'
                   SIM: 'supported'
              Networks: 'gsm, umts'

關於@aleksander在他的回答評論中的問題，這是使用apn時的錯誤：

error: couldn't start network: QMI protocol error (14): 'CallFailed'
call end reason (3): generic-no-service
verbose call end reason (3,2001): [cm] no-service
[/dev/cdc-wdm0] Client ID not released:
   Service: 'wds'
       CID: '1'
[19 marras 2014, 13:30:30] [Debug] [/dev/cdc-wdm0] Unregistered 'wds' client with ID '1'
[19 marras 2014, 13:30:30] [Debug] Client released

戴爾品牌的 Sierra Wireless 調製解調器，如 5570（我自己現在買了）需要一個神奇的“DMS Set FCC Auth”命令才能從低功耗模式中恢復，這裡有更好的解釋：https ://sigquit.wordpress.com/2015/02 /09/dell-brand-sierra-wireless-3g4g-modem-not-online/

如果您使用的是 ModemManager，您可以嘗試libqmi從 git 編譯您的 ModemManager 和 ModemManager 以解決此問題。

您在--wds-start-network選項中缺少 APN。如果您在 CDMA/EVDO 網路中，則不需要它，但在 GSM/UMTS/LTE 中（通常）需要一個明確的網路。

一旦 QMI WDS Start Network 返回且沒有錯誤，只需嘗試dhclient在 WWAN 界面中執行。

引用自：https://unix.stackexchange.com/questions/152019

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