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#!/bin/sh
set -e

if [ "$#" -ne 1 ]; then
    echo "Need parameter for HOST IP/NAME."
fi

MY_HOST=$1

cd /etc/openvpn

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Environment

• Debian: Jessie
• Mail Server: Exim
• Anti-Virus: Clamav

Install packages

1. apt-get install clamav clamav-daemon exim4-daemon-heavy

Configuration of Clamav

1. Modify /etc/clamav/clamd.conf

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%%%
%%% Prepare Chinese Font of 微軟正黑體
%%%
%%% Make PDF file:
%%%   xelatex xetex-sample.tex
%%%
\documentclass{article}
\usepackage{xeCJK}
\setCJKmainfont[BoldFont=msjhbd.ttf]{msjh.ttf}

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Get Signal

qmicli -d /dev/cdc-wdm0 -p --nas-get-signal-strength

PIN Code unlock (PIN=0000)

qmicli -d /dev/cdc-wdm0 -p --dms-uim-verify-pin=PIN,0000

Dial-up (APN=internet)

qmicli -d /dev/cdc-wdm0 -p --wds-start-network=internet --client-no-release-cid --device-open-net='net-802-3|net-no-qos-header'

Release CID

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General

Check AT command

at

Check PIN code

at+cpin?

Enter PIN code (pin code = 0000)

at+cpin=0000

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Reference

Step by step

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#!/usr/bin/env python

import serial
import binascii

ser=serial.Serial('/dev/ttyM0', baudrate=38400, timeout=1)
ser.write(binascii.unhexlify('010200010001e80a'))
r = ser.read(16)
if r is not None:
    print repr(binascii.hexlify(r))

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#!/usr/bin/env python

from pymodbus.client.sync import ModbusSerialClient

import logging
logging.basicConfig()
log = logging.getLogger()
log.setLevel(logging.DEBUG)

client = ModbusSerialClient(method='rtu', port='/dev/ttyM0', baudrate=38400, parity='N', bytesize=8, stopbits=1, timeout=1)

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Comparison

• TCP:

  • Connection based
  • Guaranteed reliable and ordered
  • Automatically breaks up your data into packets for you
  • Makes sure it doesn’t send data too fast for the internet connection to handle (flow control)
  • Easy to use, you just read and write data like its a file

• UDP: