玖叶教程网

确认homeassistant已经配置自动发现后，编写python代码运行即可：

Switches开关如下：

homeasstant官网说明：https://www.home-assistant.io/docs/mqtt/discovery/

视频过程：HA自动发现mqtt设备（灯光篇）lighting

python代码：

#homeassistant-MQTT-Discovery 
import paho.mqtt.client as mqtt
import time
#HOST = "test.mosquitto.org"
HOST = "127.0.0.1"
PORT = 1883

def on_message_callback(client, userdata, message):
    print(message.topic+" " + ":" + str(message.payload))
    client.publish('homeassistant/light/kitchen/state', message.payload)

def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))
    if(str(rc) == '0'):
        print("start")
        client.publish("homeassistant/light/kitchen/config",
                       '{\
                          "~": "homeassistant/light/kitchen",\
                          "name": "Kitchen",\
                          "unique_id": "kitchen_light",\
                          "cmd_t": "~/set",\
                          "stat_t": "~/state",\
                          "schema": "json",\
                          "brightness": true\
                        }')
        client.subscribe("homeassistant/light/kitchen/set")
#         client.subscribe("#")#订阅所有主题



client = mqtt.Client()

client.connect(HOST, PORT, 60)

client.username_pw_set('coolcall', '123123')

client.on_connect = on_connect

client.on_message = on_message_callback

client.loop_start()#起了一个新的线程用于 message 的接收，当内部的线程接收到 message 后再调用回调函数。

运行后，可在homeassistant的mqtt实体注册或者开发者工具选项里面发现设备。

单独发送测试命令：

#client.publish('homeassistant/light/kitchen/state', '{"state": "OFF"}')
client.publish('homeassistant/light/kitchen/state', '{"state": "ON", "brightness": 255}')

添加是提到首页概览中：

测试成功