#!/bin/bash

cat > /etc/ppp/pap-secrets <<EOF
'YOUR-USER-HERE' * 'YOUR-PASSWORD-HERE' *
EOF

cat > /etc/ppp/gprs-connect <<EOF
TIMEOUT         30
ABORT           'BUSY'
ABORT           'ERROR'
ABORT           'NO CARRIER'
''              'AT'
OK              AT+CGDCONT=1,"IP","YOUR-APN-HERE","0.0.0.0",0,0
OK              ATD*99***1#
CONNECT         ''
EOF

cat > /etc/ppp/gprs-disconnect <<EOF
ABORT           'BUSY'
ABORT           'ERROR'
ABORT           'NO DIALTONE'
TIMEOUT         30
''              '+++\c'
SAY             " + sending break"
'NO CARRIER'    'ATH'
SAY             "\n + dropping data connection"
OK              'AT+CGATT=0'
SAY             "\n + disconnecting from GPRS"
OK              '\c'
SAY             "\n + disconnected."
EOF

cat > /etc/ppp/peers/gprs <<EOF
/dev/ttySC0 115200
# The chat script, customize your APN in this file
connect 'chat -s -v -f /etc/ppp/gprs-connect -T YOUR-APN-HERE'
# The close script
disconnect 'chat -s -v -f /etc/ppp/gprs-disconnect'
# Hide password in debug messages
hide-password
# The phone is not required to authenticate
login
noauth
user "YOUR-USER-HERE"
password "YOUR-PASSWORD-HERE"
#persist
# Debug info from pppd
debug
# If you want to use the HSDPA link as your gateway
defaultroute
# pppd must not propose any IP address to the peer
noipdefault
# No ppp compression
novj
novjccomp
noccp
ipcp-accept-local
ipcp-accept-remote
local
# For sanity, keep a lock on the serial line
lock
modem
dump
updetach
# Hardware flow control
nocrtscts
remotename 3gppp
ipparam 3gppp
ipcp-max-failure 30
# Ask the peer for up to 2 DNS server addresses
usepeerdns
EOF

cat > /etc/network/interfaces.d/ppp0 <<EOF
auto ppp0
iface ppp0 inet ppp
provider gprs
EOF
}