TCP-IP-Project-Kavach

Project for the grading of TCP/IP Networking course Course Code: E2 232

About

This is a train collision avoidance system. This project deals with very specific situation with following constrains/assumptions:-

1. Two Trains are moving on the same track with a maximum speed of 100 Km/hr or 27.77 m/s.
2. RFID tags are kept every 1 km.
   • Every train need approx 400m to stop (for deceleration of 0.1*g)
   • To prevent head-on collision train must apply break when they are 800m apart which is 1km roughly.
3. Both the trains have RFID tag readers with a range of 40m approx.
4. RFID tags can store two things (in user data section): position ID and Track ID.
5. Track ID inform on which track the tag is present.
6. Position ID infrom about the posion of the train on the given track. ( tags are placed in increasing order of Position ID in one direction of the track)
7. Hosts are Rpi4.

Project Features

1. TLS connection for secure communication
   • Only valid host( who have valid certificate) can connect with the server.
   • Data is encrypetd.
2. Authentication of user for further communication: Valid host must also know the user-name and password.
3. Keepalive feature included: Clients will be informed if server is down.
4. Threading for simultaneous client handling.
5. SHA256 hashing: Password protection on both server and client side. This provides more security for stored passwords.
6. Latency:
   • Authentication: 300 - 350 ms
   • Receiving STOP signal (RTT+processing): 5 ms
7. Reliability
   • TLS performs retransmission in case of a packet loss
   • Latency is low, therefore we have enough time for retransmission.
   • Trains receive stop signal way before breaking distance (minimum distance before which trains need to apply breaks to avoide head on collision). If a train misses a tag it will still have another chance.

Setup

Brief info about the files:-

1. server.py: It contains the python code for running the server.
2. client.py: It contains the python code for running the client.
3. auth_data.csv: It contains the list of valid usernames and passwords in SHA256 hashed format.
4. certificates/CA_cert.sh: It creates the necessary certificates and keys using OpenSSL.

Command to run server at IPv4 10.0.0.1 with port 3000

python3 server.py -sIP 10.0.0.1 -p 3000

Command to run client with port 3000 to connect to server at IPv4 10.0.0.1

python3 client.py -sIP 10.0.0.1 -p 3000

Running Simulation

We can simulate four scenarios, and every scenario has its own simulation number.

Simulation Number	Scenario
0	Train A and Train B are on different tracks
1	Train A and Train B are moving towards each other on same track
2	Train A and Train B are moving away from each other on same track
3	Train A and Train B are moving in same direction on same track

Example for running a simulation

In this example we are running simulation 1 where server IP is 10.114.240.240

Train A

python3 client.py -sIP 10.114.240.240 -p 3000 -train A -sim 1

Train B

python3 client.py -sIP 10.114.240.240 -p 3000 -train B -sim 1

Server

python3 server.py -p 3000

For more information about the option run

python3 client.py -h
python3 server.py -h

Dummy username and password

username,password
user1,password1
user2,password2

Team Members

1. SUNDARESAN G., M. Tech. CDS'24
2. UJJWAL CHAUDHARY, M. Tech. ESE'25
3. R. GUHAN, M. Tech. ESE'25