Raspberry connects EC20 for PPP dialing

Use raspberry pie to connect EC20 Extended version （ Here's the picture ）, Conduct ppp dial , Achieve the purpose of using cellular network to surf the Internet

Raspberry pie version ：Raspberry 3B
Operating system version ：

4G modular ：EC20

One 、 Get ready ：

1、 Add SIM card
2、 take EC20 Extended version inserted Raspberry On
3、 take EC20 On the expanded version “ data / Power supply port ” use USB Line connected Raspberry Of USB On the interface ,
4、 Check whether

lsusb

5、 Check

lsmod

6、 Get into /dev/ Catalog view ttyUSB equipment , See if the module device is recognized .

ls /dev |grep ttyUSB

Two 、 To configure

1、 Get into /etc/ Catalog view rc.local file , Add the following device information 【 The seller tutorial says to do this step , But it will cause an error when starting up , Comment out does not affect the Internet 】

echo '2c7c 0125 ff' > /sys/bus/usb-serial/drivers/option1/new_id 
echo '1c9e 9b05 ff' > /sys/bus/usb-serial/drivers/option1/new_id 
echo '2001 7e16 ff' > /sys/bus/usb-serial/drivers/option1/new_id 
echo '05c6 6000 ff' > /sys/bus/usb-serial/drivers/option1/new_id 
echo '05c6 9025 ff' > /sys/bus/usb-serial/drivers/option1/new_id 
echo '05c6 9020 ff' > /sys/bus/usb-serial/drivers/option1/new_id 
echo '05c6 9215 ff' > /sys/bus/usb-serial/drivers/option1/new_id 
echo '19d2 0579 ff' > /sys/bus/usb-serial/drivers/option1/new_id 
echo '2949 8247 ff' > /sys/bus/usb-serial/drivers/option1/new_id 
echo '1c9e 9b3c ff' > /sys/bus/usb-serial/drivers/option1/new_id

2、 New configuration file （ It seems that it must be placed in this position ）：

sudo nano /etc/ppp/peers/myppp

The contents of the document are as follows

#/etc/ppp/peers/file_name

# Usage: root> pppd call file_name

#  Hide the password when debugging 
hide-password

#  This phone does not require authentication 
noauth

#############################################
#  Be careful :  Here we need to know chat Installation location ,  If not in the environment variable 
#  Inside ,  Then specify the location ( Such as  /usr/sbin/chat -s -v -f)
#############################################
#  For call control scripts 
connect 'chat -s -v -f /etc/ppp/peers/myppp-chat-connect'

#  Disconnect script 
disconnect 'chat -s -v -f /etc/ppp/peers/myppp-chat-disconnect'

#  Debugging information 
debug

#  Module serial port device 
/dev/ttyUSB3

#  Serial port baud rate 
115200

#  Use default routing 
defaultroute 

#  Cannot specify default IP
noipdefault 

# No ppp compression 
novj 
novjccomp 
noccp 
ipcp-accept-local 
ipcp-accept-remote 
local 

#  It is better to lock the serial bus 
lock
dump

nodetach
# Keep pppd attached to the terminal 

#  user name   password 
# user root
# password

#  Hardware control flow 
crtscts
remotename 3gppp
ipparam 3gppp

#  Request the most from the other party 2 individual DNS Server address 
usepeerdns

3、 Create a new connection file ：

sudo nano myppp-chat-connect

The contents of the document are as follows

TIMEOUT 15
#  continuity 15 second ,  Received the following characters ,  Exit execution 
ABORT   "BUSY" 
ABORT   "NO CARRIER" 
ABORT   "NO DIALTONE" 
ABORT   "ERROR" 
ABORT   "NO ANSWER" 

TIMEOUT 40 
# 40 The specified character is not received within seconds ,  sign out 
#  Such as : OK \rATZ,  send out  ATZ,  Hope to receive  OK.
"" AT  
OK \rATZ 

#  Establishing a connection :  The mobile is cmnet\ Unicom's is 3gnet, Modify according to your own situation 
OK \rAT+CGDCONT=1,"IP","cmnet",,0,0 

#  dial 
OK-AT-OK ATDT*99# 
CONNECT \d\c 

4、 Create a new disconnected file

sudo nano myppp-chat-disconnect

The contents of the document are as follows

ABORT "ERROR" 
ABORT "NO DIALTONE" 
SAY "\NSending break to the modem\n"
""\k" ""+++ATH" SAY "\nGood bye !\n"

5、 install ppp

sudo apt-get install ppp

3、 ... and 、 networking

1、 Connect 【 must cd To /etc/ppp/peers, Otherwise, the report will be wrong 】

pppd call myppp &

The print is as follows

pppd options in effect:
debug		# (from /etc/ppp/peers/myppp)
nodetach		# (from /etc/ppp/peers/myppp)
dump		# (from /etc/ppp/peers/myppp)
noauth		# (from /etc/ppp/peers/myppp)
remotename 3gppp		# (from /etc/ppp/peers/myppp)
/dev/ttyUSB3		# (from /etc/ppp/peers/myppp)
115200		# (from /etc/ppp/peers/myppp)
lock		# (from /etc/ppp/peers/myppp)
connect chat -s -v -f /etc/ppp/peers/myppp-chat-connect		# (from /etc/ppp/peers/myppp)
disconnect chat -s -v -f /etc/ppp/peers/myppp-chat-disconnect		# (from /etc/ppp/peers/myppp)
crtscts		# (from /etc/ppp/peers/myppp)
local		# (from /etc/ppp/peers/myppp)
asyncmap 0		# (from /etc/ppp/options)
lcp-echo-failure 4		# (from /etc/ppp/options)
lcp-echo-interval 30		# (from /etc/ppp/options)
hide-password		# (from /etc/ppp/peers/myppp)
novj		# (from /etc/ppp/peers/myppp)
novjccomp		# (from /etc/ppp/peers/myppp)
ipcp-accept-local		# (from /etc/ppp/peers/myppp)
ipcp-accept-remote		# (from /etc/ppp/peers/myppp)
ipparam 3gppp		# (from /etc/ppp/peers/myppp)
noipdefault		# (from /etc/ppp/peers/myppp)
defaultroute		# (from /etc/ppp/peers/myppp)
usepeerdns		# (from /etc/ppp/peers/myppp)
noccp		# (from /etc/ppp/peers/myppp)
noipx		# (from /etc/ppp/options)
timeout set to 15 seconds
abort on (BUSY)
abort on (NO CARRIER)
abort on (NO DIALTONE)
abort on (ERROR)
abort on (NO ANSWER)
timeout set to 40 seconds
send (AT^M)
expect (OK)
AT^M^M
OK
 -- got it

send (^MATZ^M)
expect (OK)
^M
ATZ^M^M
OK
 -- got it

send (^MAT+CGDCONT=1,"IP","cmnet",,0,0^M)
expect (OK)
^M
AT+CGDCONT=1,"IP","cmnet",,0,0^M^M
OK
 -- got it

send (ATDT*99#^M)
expect (CONNECT)
^M
ATDT*99#^M^M
CONNECT
 -- got it

send (\d)
Script chat -s -v -f /etc/ppp/peers/myppp-chat-connect finished (pid 685), status = 0x0
Serial connection established.
using channel 1
Using interface ppp0
Connect: ppp0 <--> /dev/ttyUSB3
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x916190ae> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x0 <asyncmap 0x0> <auth chap MD5> <magic 0x79503a8c> <pcomp> <accomp>]
No auth is possible
sent [LCP ConfRej id=0x0 <auth chap MD5>]
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x916190ae> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x79503a8c> <pcomp> <accomp>]
sent [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x79503a8c> <pcomp> <accomp>]
sent [LCP EchoReq id=0x0 magic=0x916190ae]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
rcvd [LCP DiscReq id=0x2 magic=0x79503a8c]
rcvd [LCP EchoRep id=0x0 magic=0x79503a8c 91 61 90 ae]
rcvd [IPCP ConfReq id=0x0]
sent [IPCP ConfNak id=0x0 <addr 0.0.0.0>]
rcvd [IPCP ConfNak id=0x1 <addr 10.115.59.42> <ms-dns1 211.136.20.203> <ms-dns2 211.136.17.107>]
sent [IPCP ConfReq id=0x2 <addr 10.115.59.42> <ms-dns1 211.136.20.203> <ms-dns2 211.136.17.107>]
rcvd [IPCP ConfReq id=0x1]
sent [IPCP ConfAck id=0x1]
rcvd [IPCP ConfAck id=0x2 <addr 10.115.59.42> <ms-dns1 211.136.20.203> <ms-dns2 211.136.17.107>]
Could not determine remote IP address: defaulting to 10.64.64.64
not replacing default route to eth0 [192.168.1.1]
local  IP address 10.115.59.42
remote IP address 10.64.64.64
primary   DNS address 211.136.20.203
secondary DNS address 211.136.17.107
Script /etc/ppp/ip-up started (pid 690)
Script /etc/ppp/ip-up finished (pid 690), status = 0x0

After dialing successfully , Two... Will be returned DNS Server address :

primary   DNS address 211.136.20.203
secondary DNS address 211.136.17.107

2、 take /etc/ppp/resolv.conf File copy to /etc/ Next , be used for DNS analysis

nameserver DNS address 211.136.20.203
nameserver DNS address 211.136.17.107

3、 Add route ( If there were no other network cards and routing tables [default], You can go online directly , This step is not necessary )
You need to add a route , Because , pppd When dialing, a virtual network card , We need to access the Internet through this network card , Use ifconfig command , You can see an additional network card , It's usually ppp0:

ppp0      Link encap:Point-to-Point Protocol  
          inet addr:10.186.110.45  P-t-P:10.64.64.64  Mask:255.255.255.255

Execute the following command

sudo route del default
sudo route add default dev ppp0

4、 Last ping You can surf the Internet in a moment
This is encapsulated python Code
https://download.csdn.net/download/u014492512/11752490

Reference link ：
【PPP Dial up steps 】
【 The embedded Linux utilize ppp Realization 4G Module networking 】