.NET Information center: Using SerialPort And AT Commands for Query Cell Phones

Sunday, April 28, 2013

Using SerialPort And AT Commands for Query Cell Phones

Introduction

Connecting to cell phone in an easy way and getting its information is very important for some applications such as SMS Senders and Bluetooth connections and this tip shows how to connect to cell phones that are connected to the computer by Bluetooth or USB cable that have one Com Port and request AT Command from mobile set.

Background

Decrypting and encrypting files and data is a very sophisticated subject but I am using that in this tip just for the main subject.

This project scenario steps are as follows:

Connect cell phone by Bluetooth or other connectivity tools to computer
Select source file and mobile Com port and select output file path
Create target file and get length of source file in byte count
Connect to mobile phone and read its Serial Number
Decrypt/Encrypt source file to target file by XOR Style that XOR all source file bytes by XOR to Key value that in this project is Mobile Phone Serial Number

Text and binary files format and its standards vary, for example character standards (ASCII, Unicode v1,2,3,4 and other), video and image files header and data.

For this reason, read and write files must be done in a basic way. Read and write byte to byte (8 bit) from source to target.

Using the Code

Reading Com Ports

From static method in SerialPort class loads all Com (Serial) Ports to Port Combo:

private void btnRefreshports_Click(object sender, EventArgs e)

{

cmbPort.Items.Clear();

string[] lPorts = SerialPort.GetPortNames();

foreach (string str in lPorts)

{

cmbPort.Items.Add(str);

}

if (cmbPort.Items.Count > 0)

cmbPort.SelectedIndex = 0;

}