diff --git a/README.md b/README.md
index b3069be..9bc0b93 100644
--- a/README.md
+++ b/README.md
@@ -73,29 +73,11 @@ __NOTE__
 Check [here](http://www.ti.com/lit/an/slla337/slla337.pdf).
 
 
-# Installation for ESP32
+# Installation
 ```
 git clone https://github.com/nopnop2002/esp-idf-can2http
 cd esp-idf-can2http
-idf.py set-target esp32
-idf.py menuconfig
-idf.py flash
-```
-
-# Installation for ESP32-S2
-```
-git clone https://github.com/nopnop2002/esp-idf-can2http
-cd esp-idf-can2http
-idf.py set-target esp32s2
-idf.py menuconfig
-idf.py flash
-```
-
-# Installation for ESP32-C3
-```
-git clone https://github.com/nopnop2002/esp-idf-can2http
-cd esp-idf-can2http
-idf.py set-target esp32c3
+idf.py set-target {esp32/esp32s2/esp32c3}
 idf.py menuconfig
 idf.py flash
 ```
@@ -105,7 +87,7 @@ idf.py flash
 ![config-app](https://user-images.githubusercontent.com/6020549/123870638-94709180-d96d-11eb-94da-b4860148be6a.jpg)
 
 ## CAN Setting
-![config-can](https://user-images.githubusercontent.com/6020549/123870665-a05c5380-d96d-11eb-89b1-78a274bfd957.jpg)
+![config-can](https://user-images.githubusercontent.com/6020549/160263252-f2a10f2b-a970-44bf-ab9c-22ae7baa4ab5.jpg)
 
 ## WiFi Setting
 ![config-wifi-1](https://user-images.githubusercontent.com/6020549/125028704-73254900-e0c3-11eb-9a44-25482d7a08be.jpg)
@@ -118,7 +100,7 @@ You can connect using mDNS.
 
 ## External HTTP Server Setting   
 The External HTTP Server receives CAN Bus received data.   
-![config-http](https://user-images.githubusercontent.com/6020549/123873614-b5d37c80-d971-11eb-8ead-827f52aed982.jpg)
+![config-http](https://user-images.githubusercontent.com/6020549/160263251-1b1a4771-a5f0-43f2-b75e-572fa6904ac9.jpg)
 
 __Note__   
 The Built-in HTTP Server receives CAN Bus transmittion data.   
@@ -178,10 +160,12 @@ CANBus reception using UNO.
 
 # HTTP Server Using Tornado
 ```
+cd $HOME
 sudo apt install python3-pip python3-setuptools
 python -m pip install -U pip
 python -m pip install -U wheel
 python -m pip install tornado
+cd esp-idf-can2http
 cd tornado
 python can.py
 ```
@@ -190,11 +174,13 @@ python can.py
 
 # HTTP Server Using Flask
 ```
+cd $HOME
 sudo apt install python3-pip python3-setuptools
 python -m pip install -U pip
 python -m pip install -U wheel
 python -m pip install -U Werkzeug
 python -m pip install flask
+cd esp-idf-can2http
 cd flask
 python can.py
 ```
diff --git a/main/Kconfig.projbuild b/main/Kconfig.projbuild
index 7904ae3..6369b57 100644
--- a/main/Kconfig.projbuild
+++ b/main/Kconfig.projbuild
@@ -65,6 +65,7 @@ menu "Application Configuration"
 
 		config ENABLE_PRINT
 			bool "Output the received CAN FRAME to STDOUT"
+			default y
 			help
 				Output the received CAN FRAME to STDOUT.
 
@@ -129,7 +130,7 @@ menu "Application Configuration"
 
 		config WEB_SERVER
 			string "HTTP Server IP or mDNS"
-			default "myhttpserver"
+			default "httpserver.local"
 			help
 				The host name or IP address of the HTTP server to use.
 
diff --git a/main/main.c b/main/main.c
index e1a33a0..269ca10 100644
--- a/main/main.c
+++ b/main/main.c
@@ -1,9 +1,9 @@
 /*
-   This example code is in the Public Domain (or CC0 licensed, at your option.)
+	 This example code is in the Public Domain (or CC0 licensed, at your option.)
 
-   Unless required by applicable law or agreed to in writing, this
-   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
-   CONDITIONS OF ANY KIND, either express or implied.
+	 Unless required by applicable law or agreed to in writing, this
+	 software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+	 CONDITIONS OF ANY KIND, either express or implied.
 */
 
 #include <stdio.h>
@@ -65,7 +65,7 @@ static EventGroupHandle_t s_wifi_event_group;
  * - we are connected to the AP with an IP
  * - we failed to connect after the maximum amount of retries */
 #define WIFI_CONNECTED_BIT BIT0
-#define WIFI_FAIL_BIT	   BIT1
+#define WIFI_FAIL_BIT		 BIT1
 
 static int s_retry_num = 0;
 
@@ -102,17 +102,21 @@ void wifi_init_sta()
 	s_wifi_event_group = xEventGroupCreate();
 
 	ESP_LOGI(TAG,"ESP-IDF Ver%d.%d", ESP_IDF_VERSION_MAJOR, ESP_IDF_VERSION_MINOR);
+	ESP_LOGI(TAG,"ESP_IDF_VERSION %d", ESP_IDF_VERSION);
 
-#if ESP_IDF_VERSION_MAJOR >= 4 && ESP_IDF_VERSION_MINOR >= 1
+//#if ESP_IDF_VERSION_MAJOR >= 4 && ESP_IDF_VERSION_MINOR >= 1
+#if ESP_IDF_VERSION > ESP_IDF_VERSION_VAL(4, 1, 0)
 	ESP_LOGI(TAG,"ESP-IDF esp_netif");
 	ESP_ERROR_CHECK(esp_netif_init());
 	ESP_ERROR_CHECK(esp_event_loop_create_default());
 	esp_netif_t *netif = esp_netif_create_default_wifi_sta();
+	assert(netif);
 #else
-	ESP_LOGI(TAG,"ESP-IDF tcpip_adapter");
-	tcpip_adapter_init();
-	ESP_ERROR_CHECK(esp_event_loop_create_default());
-#endif
+	ESP_LOGE(TAG,"esp-idf version 4.1 or higher required");
+	while(1) {
+		vTaskDelay(1);
+	}
+#endif // ESP_IDF_VERSION
 
 #if CONFIG_STATIC_IP
 
@@ -120,7 +124,6 @@ void wifi_init_sta()
 	ESP_LOGI(TAG, "CONFIG_STATIC_GW_ADDRESS=[%s]",CONFIG_STATIC_GW_ADDRESS);
 	ESP_LOGI(TAG, "CONFIG_STATIC_NM_ADDRESS=[%s]",CONFIG_STATIC_NM_ADDRESS);
 
-#if ESP_IDF_VERSION_MAJOR >= 4 && ESP_IDF_VERSION_MINOR >= 1
 	/* Stop DHCP client */
 	ESP_ERROR_CHECK(esp_netif_dhcpc_stop(netif));
 	ESP_LOGI(TAG, "Stop DHCP Services");
@@ -133,20 +136,6 @@ void wifi_init_sta()
 	ip_info.gw.addr = ipaddr_addr(CONFIG_STATIC_GW_ADDRESS);;
 	esp_netif_set_ip_info(netif, &ip_info);
 
-#else
-	/* Stop DHCP client */
-	tcpip_adapter_dhcpc_stop(TCPIP_ADAPTER_IF_STA);
-	ESP_LOGI(TAG, "Stop DHCP Services");
-
-	/* Set STATIC IP Address */
-	tcpip_adapter_ip_info_t ip_info;
-	memset(&ip_info, 0 , sizeof(tcpip_adapter_ip_info_t));
-	ip_info.ip.addr = ipaddr_addr(CONFIG_STATIC_IP_ADDRESS);
-	ip_info.netmask.addr = ipaddr_addr(CONFIG_STATIC_NM_ADDRESS);
-	ip_info.gw.addr = ipaddr_addr(CONFIG_STATIC_GW_ADDRESS);;
-	tcpip_adapter_set_ip_info(TCPIP_ADAPTER_IF_STA, &ip_info);
-#endif
-
 	/*
 	I referred from here.
 	https://www.esp32.com/viewtopic.php?t=5380
@@ -162,7 +151,7 @@ void wifi_init_sta()
 	d.u_addr.ip4.addr = 0x08080404; //8.8.4.4 dns
 	dns_setserver(1, &d);
 
-#endif
+#endif // CONFIG_STATIC_IP
 
 	wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
 	ESP_ERROR_CHECK(esp_wifi_init(&cfg));
@@ -383,8 +372,8 @@ void app_main()
 	// Initialize NVS
 	esp_err_t ret = nvs_flash_init();
 	if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
-	  ESP_ERROR_CHECK(nvs_flash_erase());
-	  ret = nvs_flash_init();
+		ESP_ERROR_CHECK(nvs_flash_erase());
+		ret = nvs_flash_init();
 	}
 	ESP_ERROR_CHECK(ret);