我尝试使用华为 (e3372) 的 LTE 棒连接到互联网。我安装了 usb-modeswitch、ppp 和 wvdial。 modewswitch 工作正常。该设备安装在 /dev/ttyUSB0 上，我可以在其中发送 AT 命令。我想使用 wvdial 连接，但它总是显示“PPP 守护程序已死亡：调制解调器挂断了电话（退出代码 = 16）”
我的 wvdial 命令的控制台打印是：
pi@raspberrypi:~ $ sudo wvdial
--> WvDial: Internet dialer version 1.61
--> Initializing modem.
--> Sending: ATZ
ATZ
OK
--> Sending: ATQ0 V1 E1 S0=0
ATQ0 V1 E1 S0=0
OK
--> Sending: AT+CGDCONT=1,"IP","drei.at"
AT+CGDCONT=1,"IP","drei.at"
OK
^DSFLOWRPT:00000062,00000000,00000000,0000000000000000,0000000000000084,00000000,00000000
--> Modem initialized.
--> Sending: ATDT*99#
--> Waiting for carrier.
ATDT*99#
CONNECT
--> Carrier detected. Starting PPP immediately.
--> Starting pppd at Thu Mar 2 14:08:21 2017
--> Pid of pppd: 1142
--> Using interface ppp0
--> pppd: ���v[08]��[01]
--> pppd: ���v[08]��[01]
--> pppd: ���v[08]��[01]
--> pppd: ���v[08]��[01]
--> pppd: ���v[08]��[01]
--> Disconnecting at Thu Mar 2 14:08:52 2017
--> The PPP daemon has died: A modem hung up the phone (exit code = 16)
--> man pppd explains pppd error codes in more detail.
--> Try again and look into /var/log/messages and the wvdial and pppd man pages for more information.
--> Auto Reconnect will be attempted in 5 seconds
--> Initializing modem.
--> Sending: ATZ
--> Sending: ATQ0
--> Re-Sending: ATZ
^CCaught signal 2: Attempting to exit gracefully...
--> Modem not responding.
--> Disconnecting at Thu Mar 2 14:09:00 2017
我的 wvdial 配置文件：
[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0
Init3 = AT+CGDCONT=1,"IP","drei.at"
Modem Type = Analog Modem
Baud = 9600
New PPPD = yes
Modem = /dev/ttyUSB0
ISDN = 0
Phone = *99#
Password = ;
Username = ;
Stupid Mode = 1
Dialer Attemps = 2
Carrier Check = off
是什么原因导致 ppp 守护进程挂起？
这是一个有点老的话题，但我想贡献一下，因为我发现自己在这个特定的调制解调器上遇到了麻烦，我遇到的问题（我在这篇文章中也可以看到）是使用 ttyUSB0，如果有人再次遇到这个问题：尝试更改为ttyUSB1。 Modem作为两个设备进行通信，都接受命令，但是ttyUSB0不仅挂了，而且还冻结了modem！
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