1. TCP Communication

tcpclient.py

• Connects to a server on port 41111
• Sends the numbers to the server, waits for a response, and prints the server’s reply, which includes the sum of the two numbers along with the current time.

tcpserver.py

• Binds to the server’s hostname on port 41111 and waits for client connections.
• When a client connects, it receives the numbers, calculates the sum, and sends it back to the client.
• Logs the message it received from the client and the reply it sends.

2. UDP Communication

udpclient.py

• Asks the user to enter a single number.
• Sends that number to the server at port 2233.
• Receives the server’s response (the sum if multiple numbers were sent) and displays it along with a timestamp.

udpserver.py

• Receives a number (or multiple numbers if entered) from the client, calculates the sum, and sends it back.
• Logs the client’s message and the response it sends.

Requirements

Python 3.x

How to Run the Code

• Start the Server:

  • For TCP: python3 tcpserver.py

  • For UDP: python3 udpserver.py

• Start the Client:

  • For TCP: python3 tcpclient.py

  • For UDP: python3 udpclient.py

• Example Usage:

  • For TCP: Enter two numbers separated by a space (e.g., 3 5).
  • For UDP: Enter a single number (e.g., 10).

  The server will calculate the sum and send it back with a timestamp, which the client will then display.

Sample Output

TCP Example

• Client Input: 3 5
• Server Output: 6388118: server received: 3 5
• Client Output: 6388118: <timestamp> 8

UDP Example

• Client Input: 10 20
• Server Output: 6388118: server received from: <client_address> with data 10 20
• Client Output: 6388118: <timestamp> 30

Important Notes

• Port Numbers:
  • TCP communication happens on port 41111.
  • UDP communication happens on port 2233.
• Error Handling: This is a simple example, so there’s minimal error handling. For instance, it assumes that the user will enter valid numbers.
• Timestamp: The timestamp is generated using time.asctime() and added to the server’s response.