PPPD 连接脚本失败

Question

我正在使用 Raspberry Pi 4 并尝试使用 A9G GSM/GPRS+GPS 模块访问互联网。

起初我安装了 ppp 和 sudo apt-get install ppp screen elinks
我在路径 /etc/ppp/peers/rnet:
中创建了一个名称为 rnet 的文件

# My APN internet.vodafone.gr
connect "/usr/sbin/chat -v -f /etc/chatscripts/gprs -T internet.vodafone.gr"

# Communication port:
/dev/ttyS0

# Baudrate
9600

# Assumes that your IP address is allocated dynamically by the ISP.
noipdefault

# Try to get the name server addresses from the ISP.
usepeerdns

# Use this connection as the default route to the internet.
defaultroute

# Makes PPPD "dial again" when the connection is lost.
persist

# Do not ask the remote to authenticate.
noauth

# No hardware flow control on the serial link with GSM Modem
nocrtscts

# No modem control lines with GSM Modem
local

在路径 /etc/chatscripts/gprs 的文件 gprs 中，我添加了需要 "MY_4_DIGIT_PIN":

ABORT           BUSY
ABORT           VOICE
ABORT           "NO CARRIER"
ABORT           "NO DIALTONE"
ABORT           "NO DIAL TONE"
ABORT           "NO ANSWER"
ABORT           "DELAYED"
ABORT           "ERROR"

# cease if the modem is not attached to the network yet
ABORT           "+CGATT: 0"

""              AT
TIMEOUT         12
OK              ATH
OK              ATE1

# +CPIN provides the SIM card PIN
OK              AT+CPIN="MY_4_DIGIT_PIN"

# +CFUN may allow to configure the handset to limit operations to
# GPRS/EDGE/UMTS/etc to save power, but the arguments are not standard
# except for 1 which means "full functionality".
#OK             AT+CFUN=1

OK              AT+CGDCONT=1,"IP","\T","",0,0
OK              ATD*99#
TIMEOUT         22
CONNECT         ""

所以当我尝试启动 rnet 文件时：

sudo pon rnet

我在系统日志中收到此错误消息 (cat /var/log/syslog | grep pppd):

Oct 14 18:14:22 raspberrypi pppd[3063]: pppd 2.4.7 started by pi, uid 0
Oct 14 18:14:35 raspberrypi pppd[3063]: Connect script failed
Oct 14 18:15:06 raspberrypi pppd[3063]: Connect script failed
Oct 14 18:15:37 raspberrypi pppd[3063]: Connect script failed
...

当我尝试运行下面的 AT 命令时，模块似乎工作正常并且能够连接到网络：

AT
OK

AT+CPIN?
+CPIN:READY
OK

AT+CREG?
+CREG: 1,1

OK
AT+CGATT?
+CGATT:1
OK

AT+COPS?
+COPS: 0,2,"20205"

AT+CGACT?
+CGACT: 1, 1

AT+HTTPGET="http://www.example.com/"
OK
HTTP/1.1 200 OK
...

所以我无法理解是我在文件 rnet 中写错了什么，还是我没有做对。如果您有任何想法，请帮助我。

Answer 1

问题是我的 A9G 模块没有获得足够的电力。因此，在开始该过程之前，请检查您的 A9G 模块是否已打开并确保您已禁用登录 shell 以通过串行访问，并且您还启用了串行接口。

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