diff --git a/platformio.ini b/platformio.ini
index 37e482e..36618b9 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -18,8 +18,8 @@ platform = espressif8266
 framework = arduino
 monitor_speed = 115200
 upload_speed = 115200
-upload_port = COM6
-monitor_port = COM6
+upload_port = COM5
+monitor_port = COM5
 board_build.flash_mode = dout
 build_flags =
     -Wno-unused-function
diff --git a/src/IRBabyIRIS.cpp b/src/IRBabyIRIS.cpp
index e1aaaf1..47e3490 100644
--- a/src/IRBabyIRIS.cpp
+++ b/src/IRBabyIRIS.cpp
@@ -51,12 +51,24 @@ char iris_credential_token[CREDENTIAL_MAX] = { 0 };
 char iris_server_address[URL_SHORT_MAX] = { 0 };
 
 
-
 // private function declarations
+static int processEvent(const char* event_name, const char* payload, int length);
 static String buildConnect();
-
 static String buildHeartBeat();
+static int handleHartBeat(const char* payload, int length);
+static int handleEmit(const char* payload, int length);
 
+// private variable definitions
+event_handler_t event_handler_table[] = {
+    {
+        "__hb_response",
+        handleHartBeat,
+    },
+    {
+        "__emmitCode",
+        handleEmit,
+    }
+};
 
 // public function definitions
 int getIRISKitVersion(char *buffer, int buffer_size) {
@@ -154,11 +166,37 @@ void sendIrisKitHeartBeat() {
 }
 
 void handleIrisKitMessage(const char* data, int length) {
+    int ret = 0;
+    char* payload = (char*) malloc(length + 1);
+    if (NULL != payload) {
+        strncpy(payload, data, length);
+        payload[length] = '\0';
+        INFOF("--> %s\n", payload);
+        if (OK == deserializeJson(iris_ind_doc, payload)) {
+            String event_name = iris_ind_doc["eventName"];
+            INFOF("received ind : %s\n", event_name.c_str());
+            ret = processEvent(event_name.c_str(), payload, length);
+            INFOF("event handle result = %d\n", ret);
+        }
+    }
 
+    if (NULL != payload) {
+        free(payload);
+    }
 }
 
 
 // private function definitions
+static int processEvent(const char* event_name, const char* payload, int length) {
+    int event_table_length = sizeof(event_handler_table) / sizeof(event_handler_table[0]);
+    for (int i = 0; i < event_table_length; i++) {
+        if (0 == strcmp(event_name, event_handler_table[i].event_name)) {
+            return event_handler_table[i].handler(payload, length);
+        }
+    }
+    return -1;
+}
+
 static String buildConnect() {
     String connectMessage = "";
 
@@ -182,4 +220,19 @@ static String buildHeartBeat() {
     serializeJson(iris_msg_doc, heartBeatMessage);
 
     return heartBeatMessage;
+}
+
+static int handleHartBeat(const char* payload, int length) {
+    // TODO:
+    // do nothing currently
+    (void) payload;
+    (void) length;
+    return 0;
+}
+
+static int handleEmit(const char* payload, int length) {
+    // TODO:
+    (void) payload;
+    (void) length;
+    return 0;
 }
\ No newline at end of file
diff --git a/src/IRbabyAlink.cpp b/src/IRbabyAlink.cpp
index 3fa13c5..321db58 100644
--- a/src/IRbabyAlink.cpp
+++ b/src/IRbabyAlink.cpp
@@ -31,8 +31,15 @@
 
 #include "IRbaby.h"
 
-#define TOPIC_NAME_MAX    (64)
-#define IOT_RETRY_MAX     (3)
+#define TOPIC_NAME_MAX         (64)
+#define IOT_RETRY_MAX          (3)
+
+#define IRIS_KIT_PK_DEV        "a1WlzsJh50b"
+#define IRIS_KIT_PK_REL        "a1ihYt1lqGH"
+#define TOPIC_DOWNSTREAM_DEV   "/user/iris/downstream_dev"
+#define TOPIC_UPSTREAM_DEV     "/user/iris/upstream_dev"
+#define TOPIC_DOWNSTREAM_REL   "/user/iris/downstream"
+#define TOPIC_UPSTREAM_REL     "/user/iris/upstream"
 
 String g_product_key = "";
 String g_device_name = "";
@@ -54,6 +61,18 @@ static int iot_retry = 0;
 
 void connectToAliyunIoT() {
     downstream_topic_subscribed = false;
+
+    if (g_product_key.equals(IRIS_KIT_PK_DEV)) {
+        g_upstream_topic = "/" + g_product_key + "/" + g_device_name + TOPIC_UPSTREAM_DEV;
+        g_downstream_topic = "/" + g_product_key + "/" + g_device_name + TOPIC_DOWNSTREAM_DEV;
+    } else if (g_product_key.equals(IRIS_KIT_PK_REL)) {
+        g_upstream_topic = "/" + g_product_key + "/" + g_device_name + TOPIC_UPSTREAM_REL;
+        g_downstream_topic = "/" + g_product_key + "/" + g_device_name + TOPIC_DOWNSTREAM_REL;
+    } else {
+        ERRORF("IRIS Kit release key is not supported yet\n");
+        return;
+    }
+
     INFOF("Try connecting to Aliyun IoT : %s, %s, %s, %s\n",
           g_product_key.c_str(), g_device_name.c_str(), g_device_secret.c_str(), g_region_id.c_str());
 
@@ -62,8 +81,7 @@ void connectToAliyunIoT() {
         sendIrisKitConnect();
     }
     INFOLN("Aliyun IoT connect done");
-    g_upstream_topic = g_product_key + "/" + g_device_name + "/user/iris/upstream";
-    g_downstream_topic = g_product_key + "/" + g_device_name + "/user/iris/downstream";
+    
 }
 
 void checkAlinkMQTT() {
@@ -73,6 +91,7 @@ void checkAlinkMQTT() {
     if (0 == mqttStatus) {
         iot_retry = 0;
         if (false == downstream_topic_subscribed) {
+            INFOF("subscribe topic : %s\n", g_downstream_topic.c_str());
             registerCallback(g_downstream_topic.c_str(), 0);
             downstream_topic_subscribed = true;
         } else {
@@ -105,7 +124,7 @@ static void registerCallback(const char* topic, int qos) {
 }
 
 static void irisAlinkCallback(const char *topic, uint8_t *data, int length) {
-    INFOF("IRIS downstream message : topic = %s, length = %d, data = %s\n", topic, length, (char*) data);
+    INFOF("downstream message received, topic = %s, length = %d\n", topic, length);
     if (NULL != g_downstream_topic.c_str() && 0 == strcmp(topic, g_downstream_topic.c_str())) {
         handleIrisKitMessage((const char*) data, length);
     }
diff --git a/src/IRbabyIRIS.h b/src/IRbabyIRIS.h
index 9939711..70b2ece 100644
--- a/src/IRbabyIRIS.h
+++ b/src/IRbabyIRIS.h
@@ -37,6 +37,12 @@
 #define EVENT_NAME_CONNECT           "__connect"
 #define EVENT_HEART_BEAT_REQ         "__hb_request"
 
+typedef int (*eventHandler)(const char* payload, int length);
+typedef struct {
+    const char* event_name;
+    eventHandler handler;
+} event_handler_t;
+
 int getIRISKitVersion(char *buffer, int buffer_size);
 
 int getDeviceID(char* buffer, int buffer_size);