Create app3.py

app3.py

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+from flask import Flask, render_template
+from flask_socketio import SocketIO, emit
+
+app = Flask(__name__)
+socketio = SocketIO(app)
+
+# WebSocket route for receiving data from Arduino
+@socketio.on('message')
+def handle_message(data):
+    print(f"Received from Arduino: {data}")
+    # Process the data here, or broadcast it to clients if necessary
+    emit('response', {'status': 'success', 'message': 'Data received'})
+
+# WebSocket event for a new client connecting
+@socketio.on('connect')
+def handle_connect():
+    print("Client connected.")
+
+# Home route (optional for testing purposes)
+@app.route('/')
+def index():
+    return render_template('index.html')
+
+# Run the Flask app with WebSocket support
+if __name__ == '__main__':
+    socketio.run(app, debug=True)