我尝试在 Rapsbian RPi 上使用 3G USB 调制解调器，一切顺利，除了由于某种原因 PPP 断开连接并退出代码 16。我启用了调试模式，但除了身份验证成功之外，它什么也没说。
请参阅下面的详细信息：
WvDial: Internet dialer version 1.61
Initializing modem.
Sending: ATZ
ATZ
OK
Sending: AT+CPIN=XXXX
AT+CPIN=XXXX
OK
Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
OK
Sending: AT+CGDCONT=1,"IP","internet"
AT+CGDCONT=1,"IP","internet"
OK
Modem initialized.
Sending: ATD*99#
Waiting for carrier.
ATD*99#
CONNECT 3600000
Carrier detected. Starting PPP immediately.
Starting pppd at Sun Dec 7 22:23:20 2014
Pid of pppd: 2967
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
Using interface ppp0
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
Authentication (CHAP) started
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
Authentication (CHAP) successful
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
pppd: 8�f[01]P�f[01]h�f[01]��f[01]؉f[01]0�f[01]
Disconnecting at Sun Dec 7 22:23:24 2014
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
/var/log/messages 显示：
Dec 7 22:58:45 raspberrypi pppd[3779]: pppd 2.4.5 started by root, uid 0
Dec 7 22:58:45 raspberrypi pppd[3779]: Using interface ppp0
Dec 7 22:58:45 raspberrypi pppd[3779]: Connect: ppp0 <--> /dev/ttyUSB2
Dec 7 22:58:45 raspberrypi pppd[3779]: CHAP authentication succeeded
Dec 7 22:58:45 raspberrypi pppd[3779]: CHAP authentication succeeded
Dec 7 22:58:48 raspberrypi pppd[3779]: Modem hangup
Dec 7 22:58:48 raspberrypi pppd[3779]: Connection terminated.
Dec 7 22:58:48 raspberrypi pppd[3779]: Exit.
答案1
我确实弄清楚了。问题是输入 SIM 卡 PIN 码后，wvdial 会继续拨号。这太快了。输入 PIN 码后，卡需要一段时间才能注册到网络。
我已经创建了拨号脚本，一个只需输入 PIN 码，等待 20 秒，然后另一个拨打 3G 网络，现在它可以可靠地工作。