Message Broker Platform (TCP/UDP)

This project implements a topic-based messaging broker using TCP and UDP sockets

Project Structure

.
├── server.c                  # Core broker logic (TCP/UDP)
├── subscriber.c              # TCP client with subscribe/unsubscribe commands
├── udp_client.py             # UDP publisher simulator
├── test.py / testtest.py     # Python testing utilities
├── mypayloads.json           # Custom message sets for testing
├── sample_payloads.json
├── sample_wildcard_payloads.json
├── three_topics_payloads.json
├── utils/                    # Utility functions
├── .vscode/                  # VSCode config (optional)
├── pcom_hw2_udp_client/      # Provided UDP client (original)
├── Makefile                  # Build automation for C components
├── server / subscriber       # Compiled binaries (gitignored ideally)
├── README.md                 # You're reading it!
└── readme.txt                # Original assignment description

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Build Instructions

make

This builds server and subscriber. Run make clean to remove binaries.

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How to Run

1. Start the server

./server <PORT>

2. Start a subscriber client

./subscriber <ID_CLIENT> <SERVER_IP> <PORT>

3. Publish via UDP (Python)

python3 udp_client.py <SERVER_IP> <PORT> sample_payloads.json

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Protocol Details

UDP Message Format

• topic: max 50 bytes (null-terminated)
• type: 1 byte (INT, SHORT_REAL, FLOAT, STRING)
• payload: depends on type (see README.txt)

TCP Protocol

• Length-prefixed messages (uint32_t header)
• Commands: subscribe <topic>, unsubscribe <topic>, exit

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Testing

Use the Python scripts and provided JSON files to simulate message flows and wildcard behavior:

python3 test.py             # Custom tests
python3 udp_client.py ...   # Raw publish simulation

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