diff --git a/examples/mqttclient_iot_explorer/mqttclient_iot_explorer.c b/examples/mqttclient_iot_explorer/mqttclient_iot_explorer.c
index 0239b787..b8305e34 100644
--- a/examples/mqttclient_iot_explorer/mqttclient_iot_explorer.c
+++ b/examples/mqttclient_iot_explorer/mqttclient_iot_explorer.c
@@ -5,10 +5,10 @@
 #include "cjson.h"
 #include "sal_module_wrapper.h"
 
-//#define USE_ESP8266
+#define USE_ESP8266
 //#define USE_NB_BC35
 //#define USE_BC26
-#define USE_EC200S
+//#define USE_EC200S
 
 #if defined(USE_ESP8266)
 #include "esp8266.h"