# Websockets

***

**1. Real-time Chat Application**

```python
import asyncio
import websockets

async def handler(websocket):
    while True:
        message = await websocket.recv()
        await websocket.send(message)

async def main():
    async with websockets.serve(handler, "localhost", 8765):
        await asyncio.Future()  # Run forever

asyncio.run(main())
```

**2. Live Stock Market Updates**

```python
import asyncio
import websockets
import json

async def handler(websocket):
    while True:
        stock_data = await get_stock_data()
        await websocket.send(json.dumps(stock_data))

async def get_stock_data():
    # Fetch stock data from an API or other source

async def main():
    async with websockets.serve(handler, "localhost", 8765):
        await asyncio.Future()

asyncio.run(main())
```

**3. Multiplayer Online Game**

```python
import asyncio
import websockets
import json

async def handler(websocket):
    while True:
        message = await websocket.recv()
        data = json.loads(message)
        if data['type'] == 'move':
            # Process movement data
        elif data['type'] == 'fire':
            # Process firing data

async def main():
    async with websockets.serve(handler, "localhost", 8765):
        await asyncio.Future()

asyncio.run(main())
```

**4. Real-time Location Tracking**

```python
import asyncio
import websockets
import json

async def handler(websocket):
    while True:
        location_data = await get_location_data()
        await websocket.send(json.dumps(location_data))

async def get_location_data():
    # Fetch location data from a GPS or other source

async def main():
    async with websockets.serve(handler, "localhost", 8765):
        await asyncio.Future()

asyncio.run(main())
```

**5. Remote Control of Devices**

```python
import asyncio
import websockets
import json

async def handler(websocket):
    while True:
        command = await websocket.recv()
        await execute_command(command)

async def execute_command(command):
    # Send the command to the device

async def main():
    async with websockets.serve(handler, "localhost", 8765):
        await asyncio.Future()

asyncio.run(main())
```

**6. Collaborative Text Editing**

```python
import asyncio
import websockets

async def handler(websocket):
    while True:
        operation = await websocket.recv()
        # Process the text editing operation

async def main():
    async with websockets.serve(handler, "localhost", 8765):
        await asyncio.Future()

asyncio.run(main())
```

**7. Real-time Sensor Data Monitoring**

```python
import asyncio
import websockets
import json

async def handler(websocket):
    while True:
        sensor_data = await get_sensor_data()
        await websocket.send(json.dumps(sensor_data))

async def get_sensor_data():
    # Fetch sensor data from an IoT device

async def main():
    async with websockets.serve(handler, "localhost", 8765):
        await asyncio.Future()

asyncio.run(main())
```

**8. Live Video Streaming**

```python
import asyncio
import websockets
import cv2

async def handler(websocket):
    cap = cv2.VideoCapture(0)
    while True:
        ret, frame = cap.read()
        if ret:
            encoded_frame = cv2.imencode('.jpg', frame)[1].tobytes()
            await websocket.send(encoded_frame)
        else:
            break
    cap.release()

async def main():
    async with websockets.serve(handler, "localhost", 8765):
        await asyncio.Future()

asyncio.run(main())
```

**9. Real-time Image Recognition**

```python
import asyncio
import websockets
import json
import cv2

async def handler(websocket):
    while True:
        image_data = await websocket.recv()
        image = cv2.imdecode(np.frombuffer(image_data, np.uint8), cv2.IMREAD_COLOR)
        # Perform image recognition
        result = {'objects': ['object1', 'object2']}
        await websocket.send(json.dumps(result))

async def main():
    async with websockets.serve(handler, "localhost", 8765):
        await asyncio.Future()

asyncio.run(main())
```

**10. Blockchain Transaction Monitoring**

```python
import asyncio
import websockets
import json

async def handler(websocket):
    while True:
        transaction_data = await websocket.recv()
        # Process transaction data for blockchain analysis

async def main():
    async with websockets.serve(handler, "localhost", 8765):
        await asyncio.Future()

asyncio.run(main())
```