diff --git a/lib/AliyunIoTSDK/src/AliyunIoTSDK.cpp b/lib/AliyunIoTSDK/src/AliyunIoTSDK.cpp
index 48f9db9..906d951 100644
--- a/lib/AliyunIoTSDK/src/AliyunIoTSDK.cpp
+++ b/lib/AliyunIoTSDK/src/AliyunIoTSDK.cpp
@@ -35,6 +35,8 @@ DeviceProperty PropertyMessageBuffer[MESSAGE_BUFFER_SIZE];
 #define SHA256HMAC_SIZE 32
 #define DATA_CALLBACK_SIZE 20
 
+#define MQTT_WAIT_GENERIC  (10000)
+
 #define ALINK_BODY_FORMAT "{\"id\":\"123\",\"version\":\"1.0\",\"method\":\"thing.event.property.post\",\"params\":%s}"
 #define ALINK_EVENT_BODY_FORMAT "{\"id\": \"123\",\"version\": \"1.0\",\"params\": %s,\"method\": \"thing.event.%s.post\"}"
 
@@ -129,7 +131,7 @@ int AliyunIoTSDK::mqttCheckConnect() {
                 } else {
                     Serial.print("ERROR:\tMQTT Connect err: ");
                     Serial.println(client->state());
-                    delay(10000);
+                    delay(MQTT_WAIT_GENERIC);
                     connectRetry++;
                     Serial.print("INFO:\tretry: ");
                     Serial.println(connectRetry);
diff --git a/platformio.ini b/platformio.ini
index 36618b9..37e482e 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -18,8 +18,8 @@ platform = espressif8266
 framework = arduino
 monitor_speed = 115200
 upload_speed = 115200
-upload_port = COM5
-monitor_port = COM5
+upload_port = COM6
+monitor_port = COM6
 board_build.flash_mode = dout
 build_flags =
     -Wno-unused-function
diff --git a/src/IRBabyIRIS.cpp b/src/IRBabyIRIS.cpp
index fda2206..c79364d 100644
--- a/src/IRBabyIRIS.cpp
+++ b/src/IRBabyIRIS.cpp
@@ -29,9 +29,18 @@
 #include <WString.h>
 
 #include "defines.h"
+#include "IRbabyGlobal.h"
+#include "IRbabySerial.h"
+#include "IRbabyHttp.h"
+
 #include "IRBabyIRIS.h"
 
+extern StaticJsonDocument<1024> http_request_doc;
+extern StaticJsonDocument<1024> http_response_doc;
+
 char iris_credential_token[CREDENTIAL_MAX] = { 0 };
+char iris_server_address[URL_SHORT_MAX] = { 0 };
+
 
 int getIRISKitVersion(char *buffer, int buffer_size) {
     if (NULL == buffer) {
@@ -50,4 +59,78 @@ int getDeviceID(char* buffer, int buffer_size) {
     memset(buffer, 0, buffer_size);
     snprintf(buffer, buffer_size - 1, "%s", chipId.c_str());
     return strlen(buffer);
+}
+
+int fetchIrisCredential(String credential_token,
+                        String& product_key,
+                        String& device_name,
+                        String& device_secret) {
+    int ret = -1;
+    int tsi = -1;
+    bool protocol_prefix = false;
+    String fetch_credential_url;
+    String request_data = "";
+    String response_data = "";
+
+    http_error_t http_ret = HTTP_ERROR_GENERIC;
+
+    String device_id("IRbaby_");
+    if (NULL != strstr(iris_server_address, "http://")) {
+        protocol_prefix = true;
+    }
+    if (protocol_prefix) {
+        fetch_credential_url = String(iris_server_address);
+    } else {
+        fetch_credential_url = String("http://");
+        fetch_credential_url.concat(iris_server_address);
+    }
+    fetch_credential_url.concat(String(FETCH_CREDENTIAL_SUFFIX));
+    device_id.concat(String(ESP.getChipId(), HEX));
+
+    INFOF("fetch credential URL = %s\n", fetch_credential_url.c_str());
+    if (credential_token.isEmpty()) {
+        ERRORLN("credential token is empty");
+        return -1;
+    }
+    tsi = credential_token.indexOf(",");
+    if (-1 == tsi) {
+        ERRORLN("credential token format error");
+        return -1;
+    }
+    product_key = credential_token.substring(0, tsi);
+    device_name = credential_token.substring(tsi + 1);
+    http_request_doc.clear();
+    http_request_doc["deviceID"] = device_id;
+    http_request_doc["credentialToken"] = credential_token;
+    serializeJson(http_request_doc, request_data);
+
+    http_ret = httpPost(fetch_credential_url, request_data, response_data);
+
+    if (HTTP_ERROR_SUCCESS == http_ret) {
+        http_response_doc.clear();
+        if (OK == deserializeJson(http_response_doc, response_data.c_str())) {
+            String ds = "";
+            int resultCode = http_response_doc["status"]["code"];
+            if (0 == resultCode) {
+                INFOLN("response valid, try getting entity");
+                ds = (String) http_response_doc["entity"];
+                device_secret = ds;
+                INFOF("HTTP response deserialized, PK = %s, DN = %s, DS = %s\n",
+                    product_key.c_str(), device_name.c_str(), device_secret.c_str());
+                ret = 0;
+            } else {
+                INFOF("response invalid, code = %d\n", resultCode);
+            }
+        }
+    }
+
+    return ret;
+}
+
+void sendIrisKitConnect() {
+
+}
+
+void sendIrisKitHeartBeat() {
+
 }
\ No newline at end of file
diff --git a/src/IRbaby.cpp b/src/IRbaby.cpp
index eee8c0d..7f3f41d 100644
--- a/src/IRbaby.cpp
+++ b/src/IRbaby.cpp
@@ -38,7 +38,8 @@
 
 #include "IRbaby.h"
 
-#define CREDENTIAL_INIT_RETRY_MAX  (3)
+#define CREDENTIAL_INIT_RETRY_MAX     (3)
+#define SYSTEM_DELAY                  (2000)
 
 // external variable declarations
 extern char iris_server_address[];
@@ -74,7 +75,7 @@ void setup() {
     pinMode(0, OUTPUT);
     digitalWrite(0, LOW);
     attachInterrupt(digitalPinToInterrupt(RESET_PIN), factoryReset, ONLOW);
-    delay(3000);
+    delay(SYSTEM_DELAY);
 
     Serial.clearWriteError();
     INFOLN();
@@ -161,7 +162,7 @@ void setup() {
             ERRORLN("retried fetch credential for 3 times, reset WiFi");
             wifiReset();
         }
-        delay(2000);
+        delay(SYSTEM_DELAY);
     } while (1);
 
     INFOF("credential get : %s\n", iris_credential_token);
@@ -171,7 +172,7 @@ void setup() {
 
     saveSettings();
 
-    delay(1000);
+    delay(SYSTEM_DELAY);
     connectToAliyunIoT();
     loadIRPin(ConfigData["pin"]["ir_send"], ConfigData["pin"]["ir_receive"]);
 
@@ -208,6 +209,6 @@ static void wifiReset() {
     WiFi.persistent(true);
     WiFi.disconnect(true);
     WiFi.persistent(false);
-    delay(2000);
+    delay(SYSTEM_DELAY);
     ESP.reset();
 }
diff --git a/src/IRbabyAlink.cpp b/src/IRbabyAlink.cpp
index 020d868..bbf06f6 100644
--- a/src/IRbabyAlink.cpp
+++ b/src/IRbabyAlink.cpp
@@ -98,7 +98,3 @@ static void irisAlinkCallback(const char *topic, uint8_t *data, int length) {
     INFO(", length = ");
     INFOLN(length);
 }
-
-static void sendIrisKitHeartBeat() {
-
-}
\ No newline at end of file
diff --git a/src/IRbabyHttp.cpp b/src/IRbabyHttp.cpp
index 8e383d4..f4e7a9f 100644
--- a/src/IRbabyHttp.cpp
+++ b/src/IRbabyHttp.cpp
@@ -34,115 +34,72 @@
 
 #include "IRbabyHttp.h"
 
-#define FETCH_CREDENTIAL_SUFFIX      "/irext-collect/credentials/fetch_credential"
-#define LOAD_ALIOT_ACCOUNT_SUFFIX    "/irext-collect/aliot/load_account"
-#define DOWNLOAD_PREFIX              "http://irext-debug.oss-cn-hangzhou.aliyuncs.com/irda_"
-#define DOWNLOAD_SUFFIX              ".bin"
+#define HTTP_REQUEST_MAX_RETRY        (5)
+#define HTTP_REQUEST_RETRY_INTERVAL   (200)
 
-
-extern StaticJsonDocument<1024> http_request_doc;
-extern StaticJsonDocument<1024> http_response_doc;
-
-
-char iris_server_address[URL_SHORT_MAX] = { 0 };
-
-
-int fetchIrisCredential(String credential_token,
-                        String& product_key,
-                        String& device_name,
-                        String& device_secret) {
-    int ret = -1;
-    bool protocol_prefix = false;
-    String fetch_credential_url;
-
-    String device_id("IRbaby_");
-    if (NULL != strstr(iris_server_address, "http://")) {
-        protocol_prefix = true;
-    }
-    if (protocol_prefix) {
-        fetch_credential_url = String(iris_server_address);
-    } else {
-        fetch_credential_url = String("http://");
-        fetch_credential_url.concat(iris_server_address);
-    }
-
-    HTTPClient http_client;
-    int tsi = 0;
+http_error_t httpPost(String url, String request_data, String& result) {
+    http_error_t ret = HTTP_ERROR_GENERIC;
     int response_code = 0;
-    fetch_credential_url.concat(String(FETCH_CREDENTIAL_SUFFIX));
-    device_id.concat(String(ESP.getChipId(), HEX));
-
-    INFOF("fetch credential URL = %s\n", fetch_credential_url.c_str());
-    if (credential_token.isEmpty()) {
-        ERRORLN("credential token is empty");
-        return -1;
-    }
-    tsi = credential_token.indexOf(",");
-    if (-1 == tsi) {
-        ERRORLN("credential token format error");
-        return -1;
-    }
-    product_key = credential_token.substring(0, tsi);
-    device_name = credential_token.substring(tsi + 1);
-
-    http_client.begin(wifi_client, fetch_credential_url);
+    HTTPClient http_client;
+    http_client.begin(wifi_client, url);
     http_client.addHeader("Content-Type", "application/json");
-    http_request_doc.clear();
-    http_request_doc["deviceID"] = device_id;
-    http_request_doc["credentialToken"] = credential_token;
-    String request_data = "";
-    serializeJson(http_request_doc, request_data);
+    bool request_flag = false;
 
-    response_code = http_client.POST(request_data);
-    if (200 == response_code) {
-        INFOF("HTTP response code = %d\n", response_code);
-        String payload = http_client.getString();
-        INFOF("HTTP response payload = %s\n", payload.c_str());
-        http_response_doc.clear();
-        if (OK == deserializeJson(http_response_doc, payload.c_str())) {
-            String ds = "";
-            int resultCode = http_response_doc["status"]["code"];
-            if (0 == resultCode) {
-                INFOLN("response valid, try getting entity");
-                ds = (String) http_response_doc["entity"];
-                device_secret = ds;
-                INFOF("HTTP response deserialized, PK = %s, DN = %s, DS = %s\n",
-                    product_key.c_str(), device_name.c_str(), device_secret.c_str());
-                ret = 0;
-            } else {
-                INFOF("response invalid, code = %d\n", resultCode);
-            }
+    for (int http_retry = 0; http_retry < HTTP_REQUEST_MAX_RETRY; http_retry++) {
+        response_code = http_client.POST(request_data);
+        if (HTTP_CODE_OK == response_code) {
+            INFOF("HTTP response OK : %d\n", response_code);
+            String payload = http_client.getString();
+            result = payload;
+            request_flag = true;
+            break;
+        } else {
+            ERRORF("HTTP response ERROR : %d\n", response_code);
+            delay(HTTP_REQUEST_RETRY_INTERVAL);
         }
     }
+    if (request_flag) {
+        ret = HTTP_ERROR_SUCCESS;
+    }
+    http_client.end();
+    return ret;
+}
+
+http_error_t downLoadFile(String url, String file, String path) {
+    http_error_t ret = HTTP_ERROR_GENERIC;
+    HTTPClient http_client;
+    int response_code = 0;
+    String save_path = path + file;
+    File cache = LittleFS.open(save_path, "w");
+    bool download_flag = false;
+
+    if (cache) {
+        http_client.begin(wifi_client, url);
+        for (int http_retry = 0; http_retry < HTTP_REQUEST_MAX_RETRY; http_retry++) {
+            response_code = http_client.GET();
+            if (HTTP_CODE_OK == response_code) {
+                download_flag = true;
+                break;
+            } else {
+                ERRORF("HTTP response ERROR : %d\n", response_code);
+                delay(HTTP_REQUEST_RETRY_INTERVAL);
+            }
+        }
+        if (download_flag) {
+            http_client.writeToStream(&cache);
+            ret = HTTP_ERROR_SUCCESS;
+            DEBUGF("Download %s success\n", file.c_str());
+        } else {
+            LittleFS.remove(save_path);
+            ret = HTTP_ERROR_GENERIC;
+            ERRORF("Download %s failed\n", file.c_str());
+        }
+    } else {
+        ret = HTTP_ERROR_LOCAL_SPACE;
+        ERRORLN("Don't have enough file zoom");
+    }
+    cache.close();
     http_client.end();
 
     return ret;
 }
-
-void downLoadFile(String file, String path) {
-    HTTPClient http_client;
-    String download_url = DOWNLOAD_PREFIX + file + DOWNLOAD_SUFFIX;
-    String save_path = path + file;
-    File cache = LittleFS.open(save_path, "w");
-    bool download_flag = false;
-    if (cache) {
-        http_client.begin(wifi_client, download_url);
-        for (int i = 0; i < 5; i++) {
-            if (http_client.GET() == HTTP_CODE_OK) {
-                download_flag = true;
-                break;
-            }
-            delay(200);
-        }
-        if (download_flag) {
-            http_client.writeToStream(&cache);
-            DEBUGF("Download %s success\n", file.c_str());
-        } else {
-            LittleFS.remove(save_path);
-            ERRORF("Download %s failed\n", file.c_str());
-        }
-    } else
-        ERRORLN("Don't have enough file zoom");
-    cache.close();
-    http_client.end();
-}
diff --git a/src/IRbabyHttp.h b/src/IRbabyHttp.h
index ab262b4..8a233fd 100644
--- a/src/IRbabyHttp.h
+++ b/src/IRbabyHttp.h
@@ -26,15 +26,23 @@
 
 #include <WString.h>
 
-#define URL_SHORT_MAX  (128)
+#define URL_SHORT_MAX   (128)
+
+typedef enum {
+    HTTP_ERROR_SUCCESS = 0,
+    HTTP_ERROR_RESPONSE = 1,
+    HTTP_ERROR_PAYLOAD = 2,
+    HTTP_ERROR_BUSINESS = 3,
+    HTTP_ERROR_LOCAL_SPACE = 4,
+    HTTP_ERROR_GENERIC = 7,
+    HTTP_ERROR_MAX = 15,
+} http_error_t;
 
 
-int fetchIrisCredential(String credential_token,
-                        String& product_key,
-                        String& device_name,
-                        String& device_secret);
+// public function export
+http_error_t httpPost(String url, String request_data, String& result);
 
-void downLoadFile(String file, String path);
+http_error_t downLoadFile(String url, String file, String path);
 
 
 #endif // IRBABY_HTTP_H
\ No newline at end of file
diff --git a/src/IRbabyIR.cpp b/src/IRbabyIR.cpp
index 883c136..207d0f8 100644
--- a/src/IRbabyIR.cpp
+++ b/src/IRbabyIR.cpp
@@ -28,6 +28,7 @@
 #include "IRbabyGlobal.h"
 #include "IRbabySerial.h"
 #include "IRbabyUserSettings.h"
+#include "IRbabyIRIS.h"
 #include "IRbabyHttp.h"
 
 #include "IRbabyIR.h"
@@ -71,8 +72,10 @@ bool sendIR(String file_name) {
 
 void sendStatus(String file, t_remote_ac_status status) {
     String save_path = SAVE_PATH + file;
+    String url = String(DOWNLOAD_PREFIX) + file + String(DOWNLOAD_SUFFIX);
+
     if (!LittleFS.exists(save_path)) {
-        downLoadFile(file, SAVE_PATH);
+        downLoadFile(url, file, SAVE_PATH);
     }
 
     if (LittleFS.exists(save_path)) {
diff --git a/src/IRbabyIRIS.h b/src/IRbabyIRIS.h
index 136686b..3bfe2f1 100644
--- a/src/IRbabyIRIS.h
+++ b/src/IRbabyIRIS.h
@@ -24,10 +24,26 @@
 #ifndef IRBABY_IRIS_H
 #define IRBABY_IRIS_H
 
-#define CREDENTIAL_MAX   (40)
+#define CREDENTIAL_MAX               (40)
+
+// web http call URL list
+#define FETCH_CREDENTIAL_SUFFIX      "/irext-collect/credentials/fetch_credential"
+#define LOAD_ALIOT_ACCOUNT_SUFFIX    "/irext-collect/aliot/load_account"
+#define DOWNLOAD_PREFIX              "http://irext-debug.oss-cn-hangzhou.aliyuncs.com/irda_"
+#define DOWNLOAD_SUFFIX              ".bin"
+
 
 int getIRISKitVersion(char *buffer, int buffer_size);
 
 int getDeviceID(char* buffer, int buffer_size);
 
+int fetchIrisCredential(String credential_token,
+                        String& product_key,
+                        String& device_name,
+                        String& device_secret);
+
+void sendIrisKitConnect();
+
+void sendIrisKitHeartBeat();
+
 #endif // IRBABY_IRIS_H
\ No newline at end of file