Working with BG77 and Linux

Technical Subjects Driver
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1

Hello, I am trying to use a BG77 module to provide internet access to a Raspberry pi. No calls and sms are needed.

What drivers do I need to install?

Do I have to use USB interface? or does it also work over UART?

Is there any user guide for this topic?

Thanks.

2

I think you can use the PPP.

#!/bin/sh

#quectel-pppd devname apn user password
echo "quectel-pppd options in effect:"
QL_DEVNAME=/dev/ttyUSB3
QL_APN=3gnet
QL_USER=user
QL_PASSWORD=passwd
QL_PDP=1
QL_IP=IP #IP, IPV4, IPV6, IPV4V6
if [ $# -ge 1 ]; then
	QL_DEVNAME=$1	
	echo "devname   $QL_DEVNAME    # (from command line)"
else
	echo "devname   $QL_DEVNAME    # (default)"
fi
if [ $# -ge 2 ]; then
	QL_APN=$2	
	echo "apn       $QL_APN    # (from command line)"
else
	echo "apn       $QL_APN    # (default)"
fi
if [ $# -ge 3 ]; then
	QL_USER=$3	
	echo "user      $QL_USER   # (from command line)"
else
	echo "user      $QL_USER   # (default)"
fi
if [ $# -ge 4 ]; then
	QL_PASSWORD=$4	
	echo "password  $QL_PASSWORD   # (from command line)"
else
	echo "password  $QL_PASSWORD   # (default)"
fi

CONNECT="'chat -s -v ABORT BUSY ABORT \"NO CARRIER\" ABORT \"NO DIALTONE\" ABORT ERROR ABORT \"NO ANSWER\" TIMEOUT 30 \
\"\" AT OK ATE0 OK ATI\;+CSUB\;+CSQ\;+CPIN?\;+COPS?\;+CEREG?\;\&D2 \
OK AT+CGDCONT=$QL_PDP,\\\"$QL_IP\\\",\\\"$QL_APN\\\",,0,0 OK ATD*99***$QL_PDP# CONNECT'"

OPTIONS="noauth debug defaultroute noipdefault novj novjccomp noccp ipcp-accept-local ipcp-accept-remote ipcp-max-configure 30 local lock modem dump nodetach nocrtscts usepeerdns"

if [ "$QL_IP" == "IPV6" ]; then
OPTIONS="$OPTIONS noip +ipv6"
fi
if [ "$QL_IP" == "IPV4V6" ]; then
OPTIONS="$OPTIONS +ipv6"
fi

pppd $QL_DEVNAME 115200 user "$QL_USER" password "$QL_PASSWORD" \
connect "'$CONNECT'" \
disconnect 'chat -s -v ABORT ERROR ABORT "NO DIALTONE" SAY "\nSending break to the modem\n" "" +++ "" +++ "" +++ SAY "\nGood bay\n"' \
$OPTIONS &

You can use


sh quectel-pppd.sh /dev/Main_uart
3

Hello, thank you for your help. Using pppd and chat worked.

I also discovered that in new linux distributions that use NetworkManager and ModemManager, Quectel modules (at least BG77) are automatically detected when connected through USB.

You can connect to the network using:
nmcli connection add type gsm apn < your-apn >

4

In USB mode, the modem should also support ECM and PPP.