More context on the project under /docs.

• bin/: Compiled binaries.
• src/: Source code for the implementation of the link-layer and application layer protocols. Students should edit these files to implement the project.
• include/: Header files of the link-layer and application layer protocols. These files must not be changed.
• cable/: Virtual cable program to help test the serial port. This file must not be changed.
• main.c: Main file. This file must not be changed.
• Makefile: Makefile to build the project and run the application.
• penguin.gif: Example file to be sent through the serial port.

Edit the source code in the src/ directory.

Compile the application and the virtual cable program using the provided Makefile.

You can either run the executable manually or use the Makefile target:

sudo ./bin/cable_app

or

sudo make run_cable

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

or

make run_tx

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

or

make run_rx

diff -s penguin.gif penguin-received.gif

or

make check_files

1. Run receiver and transmitter again.
2. Quickly move to the cable program console and:
   • Press 0 to unplug the cable
   • Press 2 to add noise
   • Press 1 to return to normal mode
3. Check if the received file matches the sent file, even with cable disconnections or noise.