update mqtt client

update mqtt client

components/connectivity/mqttclient/common/mqtt_log.h

@@ -2,7 +2,7 @@
  * @Author: jiejie
  * @Github: https://github.com/jiejieTop
  * @Date: 2019-12-27 03:25:58
- * @LastEditTime: 2020-06-17 20:28:18
+ * @LastEditTime: 2020-10-17 14:15:55
  * @Description: the code belongs to jiejie, please keep the author information and source code according to the license.
  */
 #ifndef _MQTT_LOG_H_
@@ -10,6 +10,10 @@
 
 #include "mqtt_defconfig.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define MQTT_LOG_BASE_LEVEL      (0)
 #define MQTT_LOG_ERR_LEVEL       (MQTT_LOG_BASE_LEVEL + 1)
 #define MQTT_LOG_WARN_LEVEL      (MQTT_LOG_ERR_LEVEL + 1)
@@ -60,4 +64,8 @@
     #define mqtt_log_init()
 #endif
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _LOG_H_ */