Update SIM7000.h

参考文档（21-30）/LocReport/SIM7000.h

@@ -9,9 +9,16 @@
 class SIM7000
 {
 public:
+    //初始化
     bool begin(Stream &port);
+
+    //向sim7000模块发送命令
     void sendCmd(const char* cmd);
+
+    //读收到的信息
     int readBuffer(char *buffer, int count, unsigned int timeout = DEFAULT_TIMEOUT, unsigned int chartimeout = DEFAULT_INTERCHAR_TIMEOUT);
+
+    //发送命令，并接收返回，判断返回内容是否包含字符串resp
     bool check_send_cmd(const char* cmd, const char* resp, unsigned int timeout = DEFAULT_TIMEOUT, unsigned int chartimeout = DEFAULT_INTERCHAR_TIMEOUT);
 private:
     SoftwareSerial* mySerial;