网上找到的mqtt客户端和publish，python代码

# !encoding:utf-8
importpaho.mqtt.publishaspublish
importtime
importpaho.mqtt.clientasmqtt
HOST ="127.0.0.1"
mqtt_server='192.168.13.101'
defclient_loop():
client_id = time.strftime('%Y%m%d%H%M%S',time.localtime(time.time()))
client = mqtt.Client(client_id)# ClientId不能重复，所以使用当前时间
client.username_pw_set("admin","123456")#必须设置，否则会返回「Connected with result code 4」
client.on_connect = on_connect
client.on_message = on_message
client.connect(mqtt_server,1883,60)
client.loop_forever()


defon_connect(client,userdata,flags,rc):
print("Connected with result code "+str(rc))
client.subscribe("test")


defon_message(client,userdata,msg):
print(msg.topic +" "+ msg.payload.decode("utf-8"))


if__name__ =='__main__':
client_loop()

# !encoding:utf-8
importpaho.mqtt.publishaspublish
importtime
importpaho.mqtt.clientasmqtt
HOST ="127.0.0.1"
PUBLISH_PORT =1883
mqtt_server='192.168.13.101'

defon_connect_publish(client,userdata,flags,rc):
print("Connected with result code "+str(rc))
client.subscribe("test")


defon_message_publish(client,userdata,msg):
print(msg.topic +" "+ msg.payload.decode("utf-8"))


defmqttpublish():
client_id = time.strftime('%Y%m%d%H%M%S',time.localtime(time.time()))
# client = mqtt.Client(client_id)    # ClientId不能重复，所以使用当前时间
# client.username_pw_set("admin", "123456")  #必须设置，否则会返回「Connected with result code 4」
# client.on_connect = on_connect
# client.on_message = on_message
# client.connect(HOST, PORT, 60)
# client.publish("test", "你好MQTT", qos=0, retain=False)  #发布消息

publish.single("test","你好MQTT",qos=1,hostname=mqtt_server,port=PUBLISH_PORT,client_id=client_id,
auth={'username':"admin",'password':"123456"})

mqttpublish()
学习用
mosquitto_pub -h 192.168.13.101 -p 1883 -u root -t "test" -m "helloe world iam"
mosquitto_sub -h 192.168.13.101 -p 1883 -t "test" -u admin -P "123456"