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Simple Socket Server #466

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646d4b0
Simple Socket Server
bravetiger01 Jul 12, 2025
63757f0
Update README.md
bravetiger01 Jul 12, 2025
464ff4b
Merge branch 'DhanushNehru:main' into main
bravetiger01 Oct 14, 2025
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1 change: 1 addition & 0 deletions README.md
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Expand Up @@ -132,6 +132,7 @@ More information on contributing and the general code of conduct for discussion
| Selfie with Python | [Selfie with Python](https://github.com/DhanushNehru/Python-Scripts/tree/main/Selfie%20with%20Python) | Take your selfie with python . |
| Simple DDOS | [Simple DDOS](https://github.com/DhanushNehru/Python-Scripts/tree/main/Simple%20DDOS) | The code allows you to send multiple HTTP requests concurrently for a specified duration. |
| Simple TCP Chat Server | [Simple TCP Chat Server](https://github.com/DhanushNehru/Python-Scripts/tree/main/TCP%20Chat%20Server) | Creates a local server on your LAN for receiving and sending messages! |
| Single Client Socket Server | [Single Client Socket Server](https://github.com/DhanushNehru/Python-Scripts/tree/main/Single%20Client%20Socket%20Server) | Creates a local socket server for a single client |
| Smart Attendance System | [Smart Attendance System](https://github.com/DhanushNehru/Python-Scripts/tree/main/Smart%20Attendance%20System) | This OpenCV framework is for Smart Attendance by actively decoding a student's QR Code. |
| Snake Game | [Snake Game](https://github.com/DhanushNehru/Python-Scripts/tree/main/Snake%20Game) | Classic snake game using python. |
| Snake Water Gun | [Snake Water Gun](https://github.com/DhanushNehru/Python-Scripts/tree/main/Snake%20Water%20Gun) | A game similar to Rock Paper Scissors. |
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50 changes: 50 additions & 0 deletions Single Client Socket Server/README.md
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# Socket Communication - Single Client and Server

This project demonstrates basic socket programming in Python with a server and a single client. The server waits for a client to connect and then allows two-way communication between the server and the client.

## 📁 Files

- `server.py` – Runs the socket server and waits for a client to connect.
- `client.py` – Connects to the server and allows interaction with it.

## 🛠 Requirements

- Python 3.x
- No external libraries required (uses built-in `socket` module)

## 🚀 How to Run

> ⚠️ Make sure both scripts are in the same directory and run them in separate terminals.

### 1. Start the Server

Open a terminal and run:

```bash
python server.py
````
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The markdown code block closing has four backticks instead of three, which may cause rendering issues.

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````

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This will start the server on `localhost` and listen on a predefined port (usually `localhost:12345` unless configured otherwise).
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The documentation incorrectly states the port as 12345, but the actual code uses port 65432. This should be updated to reflect the correct port number.

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This will start the server on `localhost` and listen on a predefined port (usually `localhost:12345` unless configured otherwise).
This will start the server on `localhost` and listen on a predefined port (usually `localhost:65432` unless configured otherwise).

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### 2. Start the Client

In a **different terminal**, run:

```bash
python client.py
```

This will connect the client to the server.

Once connected, you can exchange messages between the server and the client.



## ❗ Notes

* Only **one client** is supported at a time.
* If you close either the server or client, the socket connection will be terminated.
* If the server crashes or is stopped, the client will also lose connection.


11 changes: 11 additions & 0 deletions Single Client Socket Server/client.py
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import socket

HOST = "127.0.0.1" # The server's hostname or IP address
PORT = 65432 # The port used by the server

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.connect((HOST, PORT))
s.sendall(b"Hello, world")
data = s.recv(1024)

print(f"Received {data!r}")
17 changes: 17 additions & 0 deletions Single Client Socket Server/server.py
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import socket

HOST = "127.0.0.1" # Standard loopback interface address (localhost)
PORT = 65432 # Port to listen on (non-privileged ports are > 1023)

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s: #AF_INET for IPv4, SOCK_STREAM for TCP
s.bind((HOST, PORT)) # Bind the socket to the address and port
s.listen() # Enable the server to accept connections
print(f"Server listening on {HOST}:{PORT}")
conn, addr = s.accept() # Wait for a connection
with conn: # conn is a new socket object usable to send and receive data
print(f"Connected by {addr}") # Accept the connection
while True: # Loop to handle incoming data
data = conn.recv(1024) # Receive data from the connection
if not data:
break
conn.sendall(data) # Echo the received data back to the client
Comment on lines +10 to +17
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Copilot AI Jul 21, 2025

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The server only handles one client connection and exits after that client disconnects. Consider wrapping the accept() call in a loop to handle multiple sequential connections.

Suggested change
conn, addr = s.accept() # Wait for a connection
with conn: # conn is a new socket object usable to send and receive data
print(f"Connected by {addr}") # Accept the connection
while True: # Loop to handle incoming data
data = conn.recv(1024) # Receive data from the connection
if not data:
break
conn.sendall(data) # Echo the received data back to the client
while True: # Loop to handle multiple sequential connections
conn, addr = s.accept() # Wait for a connection
with conn: # conn is a new socket object usable to send and receive data
print(f"Connected by {addr}") # Accept the connection
while True: # Loop to handle incoming data
data = conn.recv(1024) # Receive data from the connection
if not data:
break
conn.sendall(data) # Echo the received data back to the client

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Comment on lines +14 to +17
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The server doesn't handle potential socket exceptions that could occur during recv() operations. Consider adding error handling for better user experience.

Suggested change
data = conn.recv(1024) # Receive data from the connection
if not data:
break
conn.sendall(data) # Echo the received data back to the client
try:
data = conn.recv(1024) # Receive data from the connection
if not data:
break
conn.sendall(data) # Echo the received data back to the client
except (socket.error, ConnectionResetError) as e:
print(f"Socket error occurred: {e}") # Log the error
break

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