QUECTEL EC200T 4G MODULE USAGE

1. Environment Setup¶

1. Download the documents from QUECTEL official website and the modified kernel code.

2. Sstar SDK

2. Kernel Modification¶

Add QUECTEL`s modified kernel to the corresponding directory.

Note: Pay attention to distinguish the corresponding kernel version; Consult the manufacturer for the corresponding modification reference file.(The current kernel version is 4.9.84, and you can also choose V4.9.111 or V4.9.51)

3. 3 Ways of Networking¶

EC200T supports PPP, ECM and RNDIS.

3.1. PPP¶

1. Download open source tool: PPP

   wget https://download.samba.org/pub/ppp/ppp-2.4.8.tar.gz

2. Unzip and compile

   1. tar -xvf ppp-2.4.8.tar.gz

   2. The latest pppd version use openssl by default, which need to be replaced to built-in libcrpto by modify pppd/Makefile.linux, and change #USE_CRYPT=y to USE_CRYPT=y.

   3. Use static compilation to modify pppd/Makefile.linux, change COPTS = -O2 -pipe -Wall -g to COPTS = -O2 -pipe -Wall -g --static

      ./configure
      
      make CC=arm-linux-gnueabihf-gcc
      

   If you could not find crypt library, click her to download.

3. Copy the generated program to the corresponding rootfs directory.

   cp ppp-2.4.8/chat/chat  $(ROOTFS)/usr/sbin
   cp ppp-2.4.8/pppd/pppd  $(ROOTFS)/usr/sbin
   cp ppp-2.4.8/pppddump/pppddumo $(ROOTFS)/usr/sbin
   cp ppp-2.4.8/pppstats/pppstats $(ROOTFS)/usr/sbin
   

4. Create config file

   mkdir $(ROOTFS)/etc/ppp/ $(ROOTFS)/etc/ppp/peers
   
   cp ppp-2.4.8/etc.ppp/pap-secrets $(ROOTFS)/etc/ppp
   cp ppp-2.4.8/etc.ppp/chap-secrets $(ROOTFS)/etc/ppp
   
   touch $(ROOTFS)/etc/ppp/peers/gprs
   touch $(ROOTFS)/etc/ppp/gprs-connect-chat
   touch $(ROOTFS)/etc/ppp/ip-up
   touch $(ROOTFS)/etc/ppp/ip-down
   

   /etc/ppp/peers/gprs

   # /etc/ppp/peers/gprs
   
   # Usage: root>pppd call gprs
   # Interface should be used is the interface which connects physics interface of SIM7100C Module
   
   # if the ttyname serial port does not start with "/", automatically add "/dev/"
   /dev/ttyUSB1
   
   # speed Serial port baud
   115200
   
   # hardware stream control
   crtscts
   
   # modem mode
   modem
   
   # no authentication
   noauth
   
   # refuse chap authorization
   refuse-chap
   
   # refuse mschap authorization
   refuse-mschap
   
   # refuse mschap-v2 authorization
   refuse-mschap-v2
   
   # debug mode 
   pppd will record the content of all control packets sent or received in a readable form
   debug
   
   # foreground running
   nodetach
   
   #hide-password
   
   # request 2 dns server addresses from ISP,  two of which will named as environment variables DNS1 and DNS2 and be transferred to /etc/ppp/ip-up script, and set environment variable USEPERDNS to 1.
   usepeerdns
   
   # ip is provided by ISP, disable the local ip
   noipdefault
   
   # add ISP gateway to the routing table as the default route
   defaultroute
   
   # username
   user "cmnet"
   
   0.0.0.0:0.0.0.0
   
   #ipcp-accept-local
   
   #ipcp-accept-remote
   
   # Enable the following two options to realize automatic replay of ppp disconnection
   
   # lcp connection failure times
   lcp-echo-failure 6
   
   # lcp echo sending interval
   lcp-echo-interval 10
   
   # disable ccp
   #noccp
   
   # disable tcp/ip header in Van Jacobson format
   #novj
   
   #novjccomp
   
   # reconnect instead of exit after each connection, the repeated connection times are limited by maxfail
   persist
   
   # maximum repeated connection times连接最大尝试次数，0无限制
   #maxfail
   
   # hardware dial before enable ppp
   connect '/usr/sbin/chat -s -v -f /etc/ppp/gprs-connect-chat'
   

   /etc/ppp/gprs-connect-chat

   # set timeout
   TIMEOUT 15
   
   # exit the script when received “DELAYED”, “BUSY”, “ERROR”, “NO DIALTONE”, or “NO CARRIER”
   ABORT "DELAYED"                
   ABORT "BUSY"
   ABORT "ERROR"
   ABORT "NO DIALTONE"            
   ABORT "NO CARRIER"
   
   # send AT 无期望，直接发送AT字符串
   '' AT
   
   # look up the AT command manual for the meanings below
   OK ATS0=0
   OK ATE0V1
   
   # 设置APN，移动、联通、电信各不相同，见文末表格
   OK AT+CGDCONT=1,"IP","CMNET"
   
   # 拨号开启GPRS服务，号码移动、联通、电信各不相同，见文末表格
   OK ATD*99***1#
   
   # expect to receive CONNECT
   CONNECT ''
   

   /etc/ppp/ip-up

   #!/bin/sh
   #ip-up
   dns_file="/etc/resolv.conf"
   
   if [ -f $dns_file ];then
       rm "$dns_file"
   fi
   ln /etc/ppp/resolv.conf "$dns_file"
   

   /etc/ppp/ip-down

   #!/bin/sh
   #ip-down
   #set -vx
   dns_file="/etc/resolv.conf"
   
   rm $dns_file
   
   cat > "$dns_file" <<EOF
   # auto create by ip-down
   nameserver 114.114.114.114
   nameserver 8.8.8.8
   EOF
   
   chmod 755 "$dns_file"
   
   /etc/init.d/networking restart
   
   echo "Set dns for eth0"
   

5. Kernel config, enable usb serial port driver

   CONFIG_USB_SERIAL
   CONFIG_USB_SERIAL_OPTION
   
   Device Drivers -->
   USB support  -->
       USB Serial Converter support  -->
           USB driver for GSM and CDMA modems -->
   

   Enable PPP driver

   CONFIG_PPP
   
   Device Drivers  --> 
   Network device support -->
       PPP (point-to-point protocol) support
   

6. PPP dial

   1. Connect EC200T to Takoyaki demo board after environment config.

   2. Press EC200T PWRKEY until the module activated. The /dev/ directory in Takoyaki will generate nodes ttyUSB0, ttyUSB1 and ttyUSB2.

   3. Command pppd call gprs

      Enter ping www.baidu.com to check wether the internet is connected.

3.2. ECM/RNDIS¶

1. Kernel config

   Enable usb serial port driver

   CONFIG_USB_SERIAL
   CONFIG_USB_SERIAL_OPTION
   
   Device Drivers -->
   USB support  -->
       USB Serial Converter support-->
               USB driver for GSM and CDMA modems -->
   

   Enable ECM/RNDIS driver

   1. CONFIG_USB_NET_DRIVERS
   Device Drivers -->
   Network device support -->
       USB Network Adapters -->
   
   2. CONFIG_USB_USBNET
   Device Drivers -->
   Network device support -->
       USB Network Adapters -->
           Multi-purpose USB Networking Framework -->
   
   3. CONFIG_USB_NET_RNDIS_HOST
   Device Drivers -->
   Network device support -->
       USB Network Adapters -->
           Multi-purpose USB Networking Framework -->
               Host for RNDIS and ActiveSync devices -->
   

2. Config AT Command in EC200T mode, consult manufacturer for reference document.

   1. Use AT+QICSGP to configure APN/username/password/APN.

   2. Use AT+QIACT=1 to enable PDP when in 2G/3G.

   3. Use AT+QNETDEVCTL=1,1,1 to establish a data connection。

   4. Use dhcp to configure dns and ip

   Example:

   ## 4. microcom /dev/ttyUSB
   AT+QCFG="usbnet",1
   OK
   at+cpin?
   +CPIN: READY
   OK
   at+csq
   +CSQ: 31,99
   OK
   at+qicsgp=1,1,"cmnet"
   OK
   at+cops?
   +COPS: 0,0,"CHINA MOBILE",7
   OK
   at+qnetdevctl=1,1,1
   OK
   

   dns and ip config command

   udhcpc -i usb0 -s /etc/init.d/udhcpc.script