使用Ably提供的MQTT协议支持，可将Ably的消息路由到MQTT代理服务器。以下是一些Python代码示例：

从Ably发布消息到MQTT代理服务器：

import paho.mqtt.publish as publish
from ably import AblyRest

ably = AblyRest('API_KEY')
mqtt_host = 'MQTT_HOST'
mqtt_port = 'MQTT_PORT'

channel = ably.channels.get('test')

def on_message(message):
    publish.single(topic='my/topic', payload=message.data, hostname=mqtt_host, port=mqtt_port)

channel.subscribe(on_message=on_message)

从MQTT代理服务器订阅消息并将其推送到Ably：

import paho.mqtt.client as mqtt
from ably import AblyRest

ably = AblyRest('API_KEY')
mqtt_host = 'MQTT_HOST'
mqtt_port = 'MQTT_PORT'

channel = ably.channels.get('test')

def on_connect(client, userdata, flags, rc):
    client.subscribe('my/topic')

def on_message(client, userdata, msg):
    channel.publish(msg.payload)

client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.connect(mqtt_host, mqtt_port, 60)

client.loop_forever()