nodeMCU Lua ESP8266第四课 MQTT的使用

第四课 MQTT的使用

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本教程以ESP-12N,CP2102开发板为例进行讲解。

• 代码。下载地址

分为两个文件：mqtt_test.lua和close_mqtt.lua。群文件可以下载。

--mqtt_test.lua myClient = mqtt.Client("test_mqqt_20180123_mcu",120) myClient:connect("iot.eclipse.org",     function(client)         print("connected")     end) myClient:lwt("mcu_to_pc_topic20180123","mcu is closed") myClient:on("connect",     function(clinet)         if(myClient:publish("mcu_to_pc_topic20180123","online",0,0))then             print("pc connected mcu")         end         if(myClient:subscribe("pc_to_mcu_topic20180123",0))then             print("subscribe is success.")         end     end) myClient:on("offline",     function(client)         myClient:publish("mcu_to_pc_topic20180123","offline",0,0)     end) myClient:on("message", function(client , topic , message)     print(“get a message.\n”)         print(topic..":"..message)     end)

--mqtt_close.lua if(myClient:close()) then     print("mqtt is closed.") else     print("closed is failed.") end

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  工作流程。