RK3568 用命令 pppd call lte 启动 拨号软件失败 ！

1.用命令设置:gpio echo 140 > export echo 141 > export echo 147 > export echo out > gpio140/direction echo out > gpio141/direction echo out > gpio147/direction

1. 用命令设置4G模块的开机信号控制： echo 1 > gpio147/value echo 1 > gpio141/value echo 0 > gpio140/value
   3.在 Debian 固件中，安装ppp软件:sudo apt-get update sudo apt-get install ppp
   4.生成一个新文本文件 /etc/ppp/peers/lte
   sudo cat > /etc/ppp/peers/lte <<\EOF
   nodetach
   nolock
   /dev/ttyUSB3
   115200
   user “card”
   password “card”
   nocrtscts
   modem
   hide-password
   usepeerdns
   noauth
   noipdefault
   novj
   novjccomp
   noccp
   debug
   defaultroute
   ipcp-accept-local
   ipcp-accept-remote
   connect ‘chat -s -v -f /etc/ppp/peers/lte-chat-connect’
   disconnect ‘chat -s -v -f /etc/ppp/peers/lte-chat-disconnect’
   EOF
   5.生成一个新文件 /etc/ppp/peers/lte-chat-connect
   sudo cat > /etc/ppp/peers/lte-chat-connect <<\EOF
   ABORT ‘NO CARRIER’
   ABORT ‘ERROR’
   ABORT ‘NO DIALTONE’
   ABORT ‘BUSY’
   ABORT ‘NO ANSWER’
   ‘’ AT
   OK ATE0
   OK ATD#777
   CONNECT ‘’
   EOF
   6.生成一个新文件 /etc/ppp/peers/lte-chat-disconnect
   sudo cat > /etc/ppp/peers/lte-chat-disconnect <<\EOF
   ABORT OK
   ABORT BUSY
   ABORT DELAYED
   ABORT “NO ANSWER”
   ABORT “NO CARRIER”
   ABORT “NO DIALTONE”
   ABORT VOICE
   ABORT ERROR
   ABORT RINGING
   TIMEOUT 12
   “” \K
   “” \K
   “” \K
   “” +++ATH
   “” +++ATH
   “” +++ATH
   “” ATZ
   SAY “\nGoodbay\n”
   EOF
2. 用命令 pppd call lte 启动拨号软件
   export PATH=$PATH:/sbin:/usr/sbin
   sudo pppd call lte &

很典型的拨号参数设置问题。配置接入点：at+cgdcont命令，然后拨号号码确认一下