ERSG_class - Group menseger

This project implements a "Broadcasting Chat service" using some features, such as:

• TCP-IP Client/Server;
• Posix threads;
• Message Queues;
• Daemons;
• Device Drivers.

How it works?

Each Client is connected to the Server via TCP/IP. After the connection is established, each client can send to the server a character string passed by argument via command line. The server after receiving the message, it forwards the received messages to all connected Clients, and identifies the client that has sent the message. In order to check the status of each connected client, every 5 seconds the Server checks if each client is still ONLINE or AFK. (it is not shown on the terminal).

Interconnection

How to use?

1. Installation

1.1 Clone this repository into your local machine.

$ git clone https://github.com/JoaoMiranda-88237-UM/ESRG_class

1.2. Change working directory.

$ cd ESRG_class/

1.3 Compile and create all object files

In project folder:

$ make all CC_C=<client compiler> CC_S=<server compiler> 

Example:

• Compile server with gcc;
• Compile client to Raspberry Pi (arm-linux-gcc).

$ make all CC_C=arm-linux-gcc CC_S=gcc

1.4 Copy to raspberry Pi

- Client

To copy the client executable files (transfer_client):

$ make transfer_client IP=<ip connection> FOLDER=<destination folder>

Example:

• IP = 10.42.0.174
• FOLDER = etc

$ make transfer_client IP=10.42.0.174 FOLDER=etc

- Server

To copy the server executable files (transfer_server):

$ make transfer_server IP=<ip connection> FOLDER=<destination folder>

Example:

• IP = 10.42.0.174
• FOLDER = etc

$ make transfer_server IP=10.42.0.174 FOLDER=etc

- Server and Client

To copy both executable files (transfer_both):

$ make transfer_both IP=<ip connection> FOLDER=<destination folder>

Example:

• IP = 10.42.0.174
• FOLDER = etc

$ make transfer_both IP=10.42.0.174 FOLDER=etc

1.5 Remove object files

To remove all created object files (clean):

$ make clean

2. Execution

2.1 Check that you are in the right directory

$ pwd
/.../ESRG_class

2.2 Start TCP server

Starts a TCP server on a given port.

$ ./server <port>

2.3 Start Daemon client

Starts a TCP client connected to a given server name on a given port.

$ ./daemon <servername> <port> 

When this is running, a led (led0 - green led in Raspberry Pi) is light up. This is done via a device driver, developed in previous classes.

2.4 Client - Send message / see received messages

Send message to server or to see messages that have been send to the client since last time. Everytime the user wants to send a message he must use client with the wanted message to be sent.

$ ./client <msg[0}> <msg[1}> ... <msg[n]>

2.5 Close connection

2.5.1 On client

Type 'close', or use Ctrl+C.

$ ./tcpclient_send close

When this happens, the daemon terminates, and the led that was previously light up (led0) is turned off.

2.5.2 On server

Type 'close', or use Ctrl+C.

Done by

João Miranda, a88237
Duarte Rodrigues, a88259
Masters in Embedded Systems @ Universidade do Minho, 2021