MQTT是基于订阅/发布的物联网协议。
python测试需要一个发送进程和接收进程,即一个发送客户端和一个接收客户端,如果这两个客户端工作在同一个topic下,那么就能进行消息互通了。
服务器用“iot.eclipse.org”就好了,避免了自己搭建服务器,然后流程还可以跑通。
发送客户端代码:
import paho.mqtt.client as mqtt import paho.mqtt.publish as publish idx = 0
#往paho/temperature 一直发送内容 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
接收客户端代码:
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): #在这里处理业务逻辑 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)
#订阅频道 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()
然后运行两个客户端,就可以在接收端收到消息了。
MQTT服务器不负责存储数据,需要编写额外的接收客户端来接收数据、分析、入库等。
MQTT服务器用的是iot.eclipse.org,如果碰巧两个人在用同一个频道,那可能收到别人的消息哦~
如果要搭建自己的MQTT服务器,那么回头再说。
玩一玩就好了,不要给服务器增加太多负担哟~
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