如何从flask socket中的线程发送到某个套接字？

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

app = Flask(__name__)
socketio = SocketIO(app)

@app.route('/')
def index():
    return render_template('index.html')

@socketio.on('connect')
def handle_connect():
    print('Client connected')

@socketio.on('disconnect')
def handle_disconnect():
    print('Client disconnected')

@socketio.on('message')
def handle_message(data):
    print('Received message:', data)

@socketio.on('send_to_socket')
def handle_send_to_socket(data):
    # 获取要发送消息的套接字ID
    socket_id = data.get('socket_id')
    # 获取要发送的消息内容
    message = data.get('message')
    # 发送消息到指定套接字
    emit('message', message, room=socket_id)

if __name__ == '__main__':
    socketio.run(app)