mqtt 參考：
https://pypi.org/project/paho-mqtt/
https://github.com/eclipse/paho.mqtt.python
#服務端
[root@localhost ~]# cat mqtt_server.py
import paho.mqtt.client as mqtt
import paho.mqtt.publish as publish
idx = 0 #往paho/temperature 一直發送內容
while True:
print("send success")
publish.single("paho/temperature",
payload="this is message:%s"%idx,
hostname="iot.eclipse.org",
client_id="lora1",
# qos = 0,
# tls=tls,
port=1883,
protocol=mqtt.MQTTv311)
idx += 1
#客戶端
[root@localhost ~]# cat mqtt_client.py
import paho.mqtt.client as mqtt
# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):
print("Connected with result code "+str(rc))
# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
#在這里處理業務邏輯
print(msg.topic+" "+str(msg.payload))
client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.connect("iot.eclipse.org", 1883, 60) #訂閱頻道
client.subscribe("paho/temperature")
# Blocking call that processes network traffic, dispatches callbacks and
# handles reconnecting.
# Other loop*() functions are available that give a threaded interface and a
# manual interface.
client.loop_forever()
#啟動服務端，再啟動客戶端
#服務端一直發送信息 [root@localhost ~]# python3 mqtt_server.py send success send success send success send success send success send success send success send success send success send success send success #客戶端接收信息 [root@localhost ~]# python3 mqtt_client.py Connected with result code 0 paho/temperature b'this is message:125' paho/temperature b'this is message:126' paho/temperature b'this is message:127' paho/temperature b'this is message:128' paho/temperature b'this is message:129' paho/temperature b'this is message:130'
備注：
MQTT服務器不負責存儲數據，需要編寫額外的接收客戶端來接收數據、分析、入庫等。
MQTT服務器用的是iot.eclipse.org，如果碰巧兩個人在用同一個頻道，那可能收到別人的消息哦~
搭建mqtt服務器
參考：
http://emqtt.com/docs/v2/install.html
https://blog.csdn.net/qq_37258787/article/details/79776663
二、Mosquitto安裝和使用
https://lanseyujie.com/post/mosquitto-installation-and-usage.html
三、安裝mqttfx（用於測試mqtt-服務器）
相當於部署一個mqtt-server
軟件下載：
http://www.jensd.de/apps/mqttfx/1.7.0/
使用方法參考：
https://blog.csdn.net/nicholaszao/article/details/79211965