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zh.md

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+# LoRa-mqtt
+
+[![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2FIoTcat%2FLoRa-mqtt.svg?type=shield)](https://app.fossa.com/projects/git%2Bgithub.com%2FIoTcat%2FLoRa-mqtt?ref=badge_shield)
+![size](https://badge-size.herokuapp.com/iotcat/LoRa-mqtt/master/lora-mqtt.h)
+ 
+Use MQTT in LoRa communicationg..
+
+[English Version](./README.md)
+
+## Usage - with Callback Functions
+```C++
+
+#define LORA_SOCKET_IP "1.0.0.1" //need to be unique
+
+#include "lora-mqtt.h"
+
+LoRaMQTT mqtt;
+
+void setup(){
+    mqtt.ini(); //initalization
+    mqtt.onReceived(doIfRec); //register callback functions which will be executed when received message
+    mqtt.subscribe("Subject"); //subscribe MQTT subject
+}
+
+void doIfRec(String subject, String content){
+    //When received message this function will be executed.
+    
+    mqtt.publish("Subject", "Content"); //publish a mqtt message
+}
+
+void loop(){
+    //No delay() could be used in loop()
+    mqtt.core(); //Mqtt service core
+}
+
+```
+## Usage - with If in loop()
+```C++
+
+#define LORA_SOCKET_IP "1.0.0.1" //need to be unique
+
+#include "lora-mqtt.h"
+
+LoRaMQTT mqtt;
+
+void setup(){
+    mqtt.ini(); //initalization
+    mqtt.subscribe("Subject"); //subscribe MQTT subject
+}
+
+void loop(){
+    //When received message this function will be executed.
+    
+    if(mqtt.isNewMsg()){
+        String subject, content;
+        mqtt.getNewMsg(subject, content);
+        Serial.println(subject, content);
+    }
+    
+    mqtt.core(); //Mqtt service core
+}
+
+```
+
+