如何在Python flask socketio中发送到特定套接字？

from flask import Flask, render_template
from flask_socketio import SocketIO, emit

app = Flask(__name__)
app.config['SECRET_KEY'] = 'your_secret_key'
socketio = SocketIO(app)

@socketio.on('connect')
def on_connect():
    socket_id = request.sid
    # ...

@socketio.on('message')
def handle_message(data):
    socket_id = data['socket_id']
    message = data['message']
    emit('message', message, room=socket_id)