RC_T04 - Data Link

2022/2023 - 3rd Year, 1st Semester

Course - RC (Redes de Computadores | Computer Networks)

Project developed by

• Anete Pereira (up202008856)
• Isabel Amaral (up202006677)
• Milena Gouveia (up202008862)

Project description

The goal of this project was to develop a data link protocol for transferring files between two systems connected through a serial cable.

Project Structure

• bin/: Compiled binaries
• src/: Source code for the implementation of the link-layer and application layer protocols
• include/: Header files of the link-layer and application layer protocols
• cable/: Virtual cable program to help test the serial port
• main.c: Main file
• Makefile: Makefile to build the project and run the application
• penguin.gif: Example file to be sent through the serial port

Instructions to Run the Project

Step 1: Compile the application and the virtual cable program using the provided Makefile.
Step 2: Run the virtual cable program (either by running the executable manually or using the Makefile target):

./bin/cable_app
make run_cable

Step 3: Test the protocol without cable disconnections and noise

• Run the receiver (either by running the executable manually or using the Makefile target):

	./bin/main /dev/ttyS11 rx penguin-received.gif
	make run_tx

• Run the transmitter (either by running the executable manually or using the Makefile target):

	./bin/main /dev/ttyS10 tx penguin.gif
	make run_rx

• Check if the file received matches the file sent, using the diff Linux command or using the Makefile target:

	diff -s penguin.gif penguin-received.gif
	make check_files

Step 4: Test the protocol with cable disconnections and noise

• Run receiver and transmitter again
• Quickly move to the cable program console and press 0 for unplugging the cable, 2 to add noise, and 1 to normal
• Check if the file received matches the file sent, even with cable disconnections or with noise