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"""

Lab 06 — TCP Server Program

Tasks Covered:

- Task 1: TCP Server and Client communication

- Task 3: Exchange at least five messages

- Task 4: Send Student Name and Registration Number

Bonus:

- Timestamp in messages

- Convert received message to UPPERCASE

- Terminate when user types 'exit'

"""

import socket

import datetime

# ─────────────────────────────────────────

# STUDENT INFO — EDIT THESE

# ─────────────────────────────────────────

STUDENT_NAME = "Niha Hawas"

REG_NUMBER = "2312274"

# ─────────────────────────────────────────

def get_timestamp():

return datetime.datetime.now().strftime("[%H:%M:%S]")

# Create TCP Socket

server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# Allow reuse of port immediately after restart

server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

host = "127.0.0.1"

port = 12345

# Bind IP and Port

server_socket.bind((host, port))

# Listen for one incoming connection

server_socket.listen(1)

print("=" * 50)

print(" TCP SERVER STARTED")

print(f" Student : {STUDENT_NAME}")

print(f" Reg No : {REG_NUMBER}")

print("=" * 50)

print(f"Listening on {host}:{port} ...")

print("Waiting for client to connect...\n")

conn, addr = server_socket.accept()

print(f"✅ Connected with: {addr}\n")

# Send student info to client on connect

intro = f"SERVER CONNECTED | Student: {STUDENT_NAME} | Reg: {REG_NUMBER}"

conn.send(intro.encode())

msg_count = 0

while True:

try:

data = conn.recv(1024).decode()

if not data:

print("Client disconnected.")

break

msg_count += 1

ts = get_timestamp()

# Bonus: Convert to UPPERCASE before displaying

upper_data = data.upper()

print(f"{ts} Client [{msg_count}]: {data} → UPPERCASE: {upper_data}")

# Bonus: Terminate if client sent 'exit'

if data.strip().lower() == "exit":

print("Client sent 'exit'. Closing connection.")

conn.send("Server: Goodbye!".encode())

break

reply = input("Your Reply (type 'exit' to quit): ").strip()

# Bonus: Add timestamp to reply

full_reply = f"{ts} [{STUDENT_NAME} | {REG_NUMBER}] Server: {reply}"

conn.send(full_reply.encode())

# Bonus: Terminate server if server types 'exit'

if reply.lower() == "exit":

print("You ended the session.")

break

except ConnectionResetError:

print("Connection was reset by client.")

break

conn.close()

server_socket.close()

print(f"\n✅ Session ended. Total messages exchanged: {msg_count}")