Update README.md

修改README

README.md

@@ -1,2 +1,42 @@
-# EC20x_lib
+# IOLTE_Lib
 
+## 简介
+
+支持MQTT和HTTP协议操作
+理论上支持所有带串口模块进行AT指令操作，但需要逐步完善
+
+## 使用示例
+
+```c
+EC20xlib M4G(Serial2);
+···
+···
+void setup() {
+	//EC20串口初始化
+	Serial2.begin(115200);
+	//4G模块电源
+	M4G.powerOn(M4G_POWKEY);
+	//订阅回调
+	M4G.attachsubcallback(subdatacallback);
+	//模块连接状态回调
+	M4G.attacheventcallback(eventcallback);
+	logi("Init 4G");
+	uint8_t restatus = 0;
+	//模块初始化
+	restatus = M4G.begin();
+	if(restatus == 0) logi("Init 4G module -- OK");
+	//读取CCID
+	M4G.Read_CCID(simnum);
+	logi("CCID:%s",simnum);
+	//读取IMEI
+	M4G.Read_IMEI(imei_num);
+	logi("IMEI:%s",imei_num);
+	//连接MQTT
+	M4G.connectMqttServer(mqtt_pubtopic,mqtt_server,mqtt_port,mqtt_user,mqtt_pass,60,1,mqtt_willtopic,"offline");
+	//订阅主题
+	M4G.SubTopic(mqtt_subtopic,M_QOS);
+	//发布主题
+	M4G.PubTopic(mqtt_willtopic,"online",M_QOS);
+}
+
+```