diff --git a/examples/performance/README.md b/examples/performance/README.md
new file mode 100644
index 000000000..d53a8de78
--- /dev/null
+++ b/examples/performance/README.md
@@ -0,0 +1,44 @@
+# Wifi Performance Examples
+
+Some simple codes help to test the wifi performance.
+
+Including TCP/UDP TX/RX throughput.
+
+# tcp_perf
+
+This example is used to test tcp throughput and delay time. 
+
+Step1: Set options in `make menuconfig` like ssid, password, server ip and server port. And choose what the esp32 will work as.
+
+* AP or STA. You can set one esp32 as AP and another esp32 as STA with same ssid & password, also you can use Router or wifi adapter instead of one of these.
+
+* Client or server. Make sure the client has correct server ip & port so they can get connected. It's okay if you create a tcp server & client using PC since one of the wifi device is't esp32.
+
+* Send or receive. Set one of them sending data and the other receiving.
+
+Step2: Exit menuconfig, saving the new settings. Then build the app and flash it to the ESP32.
+
+Step3: Start test. And here are some things that might help you do the test easily.
+
+* You'd better turn on the AP before the STA.
+* The tcp server should be started before the tcp client.
+* If you use a esp32 as AP, you'd better use it as tcp server also.
+* Once the tcp connection crashed, esp32 should be restarted to re-establish TCP connection.
+
+Step4: View the result. After connection established, TCP server and TCP client can send data to each other. The result of throughput will be printed in the serial log.
+
+See [main.c](./tcp_perf/main/main.c) for full details.
+
+# udp_perf
+
+This example is similar to tcp_perf. Also the steps is similar to tcp_perf.
+
+There's a obvious difference between udp_perf and tcp perf:
+
+Before formal sending & receiving, a packet will be send from client to server. So the server can know the ip&port of client. It is usually eaiser to set the UDP server as the receiver.
+
+See [main.c](./udp_perf/main/main.c) for full details.
+
+# More
+
+See the [README.md](../README.md) file in the upper level [examples](../) directory for more information about examples.
diff --git a/examples/performance/tcp_perf/Makefile b/examples/performance/tcp_perf/Makefile
new file mode 100644
index 000000000..03fb85528
--- /dev/null
+++ b/examples/performance/tcp_perf/Makefile
@@ -0,0 +1,9 @@
+#
+# This is a project Makefile. It is assumed the directory this Makefile resides in is a
+# project subdirectory.
+#
+
+PROJECT_NAME := tcp_perf
+
+include $(IDF_PATH)/make/project.mk
+
diff --git a/examples/performance/tcp_perf/main/Kconfig.projbuild b/examples/performance/tcp_perf/main/Kconfig.projbuild
new file mode 100644
index 000000000..92bf8387f
--- /dev/null
+++ b/examples/performance/tcp_perf/main/Kconfig.projbuild
@@ -0,0 +1,118 @@
+menu "Example Configuration"
+
+#choice 
+#   prompt "TCP_PERF_MODE "
+#	default MODE_TCP_SHIELDBOX
+#	help
+#	    This option set performance mode.
+#	    
+#	    - Testing in shieldbox for "Performance in shieldbox" setting.
+#		
+#	    - Testing in air for "Performance in air" setting.
+#	    		
+#	    - Testing in long distance for "Performance in long distance" setting.
+#		
+#					
+#config MODE_TCP_SHIELDBOX
+#    bool "Performance in shieldbox"
+#config MODE_TCP_AIR
+#    bool "Performance in air"
+#config MODE_TCP_LONG_DISTANCE
+#    bool "Performance in long distance"
+#endchoice
+
+choice TCP_PERF_WIFI_MODE
+    prompt "AP or STA"
+    default TCP_PERF_ESP_IS_STATION
+    help
+        Whether the esp32 is softAP or station.
+
+config TCP_PERF_ESP_IS_SOFTAP
+    bool "SoftAP"
+config TCP_PERF_ESP_IS_STATION
+    bool "Station"
+endchoice
+
+config TCP_PERF_WIFI_MODE_AP
+    bool
+    default y if TCP_PERF_ESP_IS_SOFTAP
+    default n if TCP_PERF_ESP_IS_STATION
+
+choice TCP_PERF_SERVER_CLIENT
+    prompt "server or client"
+    default TCP_PERF_ESP_IS_CLIENT
+    help
+	Whether the esp32 is tcp server or client.
+		
+	We suggest to choose "client" if you choose "station" in "wifi mode".
+
+config TCP_PERF_ESP_IS_SERVER
+    bool "server"
+config TCP_PERF_ESP_IS_CLIENT
+    bool "client"
+endchoice
+
+config TCP_PERF_SERVER
+    bool
+    default y if TCP_PERF_ESP_IS_SERVER
+    default n if TCP_PERF_ESP_IS_CLIENT
+
+choice TCP_PERF_TX_RX
+    prompt "send or receive"
+    default TCP_PERF_ESP_RECV
+    help
+	Whether the esp32 will send or receive.
+
+config TCP_PERF_ESP_SEND
+    bool "send"
+config TCP_PERF_ESP_RECV
+    bool "receive"
+endchoice
+
+config TCP_PERF_TX
+    bool
+    default y if TCP_PERF_ESP_SEND
+    default n if TCP_PERF_ESP_RECV
+
+config TCP_PERF_DELAY_DEBUG
+    bool "TCP performance delay info enable"
+    depends on TCP_PERF_TX
+    default n
+    help
+	Show TCP performance delay info.
+		
+	Ignore in TCP RX.
+
+config TCP_PERF_WIFI_SSID
+    string "WiFi SSID"
+    default "esp_wifi_test1"
+    help
+	SSID (network name) for the example to connect to.
+
+config TCP_PERF_WIFI_PASSWORD
+    string "WiFi Password"
+    default "1234567890"
+    help
+	WiFi password (WPA or WPA2) for the example to use.
+		
+config TCP_PERF_SERVER_PORT
+    int "TCP server port"
+    default 4567
+    help 
+	Which will the tcp server use.
+				
+config TCP_PERF_SERVER_IP
+    string "TCP server ip"
+    default "192.168.4.1" 
+    help
+	IP of TCP server.
+		
+	Ignore in TCP server.
+	
+config TCP_PERF_PKT_SIZE
+    int "Size of TCP packet"
+    default 1460
+    help
+	the data send&recv packet size. 
+		
+endmenu
diff --git a/examples/performance/tcp_perf/main/component.mk b/examples/performance/tcp_perf/main/component.mk
new file mode 100644
index 000000000..61f8990c3
--- /dev/null
+++ b/examples/performance/tcp_perf/main/component.mk
@@ -0,0 +1,8 @@
+#
+# Main component makefile.
+#
+# This Makefile can be left empty. By default, it will take the sources in the 
+# src/ directory, compile them and link them into lib(subdirectory_name).a 
+# in the build directory. This behaviour is entirely configurable,
+# please read the ESP-IDF documents if you need to do this.
+#
diff --git a/examples/performance/tcp_perf/main/tcp_main.c b/examples/performance/tcp_perf/main/tcp_main.c
new file mode 100644
index 000000000..fbb65c0f0
--- /dev/null
+++ b/examples/performance/tcp_perf/main/tcp_main.c
@@ -0,0 +1,110 @@
+
+
+/*
+tcp_perf example
+
+Using this example to test tcp throughput performance.
+esp<->esp or esp<->ap
+
+step1:
+    init wifi as AP/STA using config SSID/PASSWORD.
+
+step2:
+    create a tcp server/client socket using config PORT/(IP).
+    if server: wating for connect.
+    if client connect to server.
+step3:
+    send/receive data to/from each other.
+    if the tcp connect established. esp will send or receive data.
+    you can see the info in serial output.
+*/
+
+#include <errno.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_log.h"
+#include "esp_err.h"
+
+#include "tcp_perf.h"
+
+
+
+//this task establish a TCP connection and receive data from TCP
+static void tcp_conn(void *pvParameters)
+{
+    ESP_LOGI(TAG, "task tcp_conn start.");
+    /*wating for connecting to AP*/
+    do
+    {
+	vTaskDelay(100);
+    }
+    while (!connectedflag);
+    ESP_LOGI(TAG, "sta has connected to ap.");
+    
+    /*create tcp socket*/
+    int socket_ret;
+    
+#if ESP_TCP_MODE_SERVER
+    vTaskDelay(3000 / portTICK_RATE_MS);
+    ESP_LOGI(TAG, "create_tcp_server.");
+    socket_ret=create_tcp_server();
+#else /*ESP_TCP_MODE_SERVER*/
+    vTaskDelay(20000 / portTICK_RATE_MS);
+    ESP_LOGI(TAG, "create_tcp_client.");
+    socket_ret = create_tcp_client();
+#endif
+    if(ESP_FAIL == socket_ret) {
+	ESP_LOGI(TAG, "create tcp socket error,stop.");
+	vTaskDelete(NULL);
+    }
+    
+    /*create a task to tx/rx data*/
+    TaskHandle_t tx_rx_task;
+#if ESP_TCP_PERF_TX
+    xTaskCreate(&send_data, "send_data", 4096, NULL, 4, &tx_rx_task);
+#else /*ESP_TCP_PERF_TX*/
+    xTaskCreate(&recv_data, "recv_data", 4096, NULL, 4, &tx_rx_task);
+#endif
+    int pps;
+    while (1) {
+	total_data = 0;
+	vTaskDelay(3000 / portTICK_RATE_MS);//every 3s
+	pps = total_data / 3;
+	if (total_data <= 0) {
+	    int err_ret = check_socket_error_code();
+	    if (err_ret == ECONNRESET) {
+		ESP_LOGI(TAG, "disconnected... stop.");
+		break;
+	    }
+	}
+
+#if ESP_TCP_PERF_TX
+	ESP_LOGI(TAG, "tcp send %d byte per sec!", pps);
+#if ESP_TCP_DELAY_INFO
+	ESP_LOGI(TAG, "tcp send packet total:%d  succeed:%d  failed:%d\n"
+		"time(ms):0-30:%d 30-100:%d 100-300:%d 300-1000:%d 1000+:%d\n",
+		total_pack, send_success, send_fail, delay_classify[0],
+		delay_classify[1], delay_classify[2], delay_classify[3], delay_classify[4]);
+#endif /*ESP_TCP_DELAY_INFO*/
+#else
+	ESP_LOGI(TAG, "tcp recv %d byte per sec!\n", pps);
+#endif /*ESP_TCP_PERF_TX*/
+    }
+    close_socket();
+    vTaskDelete(tx_rx_task);
+    vTaskDelete(NULL);
+}
+
+
+
+void app_main(void)
+{
+#if ESP_WIFI_MODE_AP
+    ESP_LOGI(TAG, "ESP_WIFI_MODE_AP\n");
+    wifi_init_softap();
+#else /*ESP_WIFI_MODE_AP*/
+    ESP_LOGI(TAG, "ESP_WIFI_MODE_STA\n");
+    wifi_init_sta();
+#endif
+    xTaskCreate(&tcp_conn, "tcp_conn", 4096, NULL, 5, NULL);
+}
diff --git a/examples/performance/tcp_perf/main/tcp_perf.c b/examples/performance/tcp_perf/main/tcp_perf.c
new file mode 100644
index 000000000..0b8447ee9
--- /dev/null
+++ b/examples/performance/tcp_perf/main/tcp_perf.c
@@ -0,0 +1,339 @@
+// Copyright 2013-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <string.h>
+#include <sys/socket.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_wifi.h"
+#include "esp_event_loop.h"
+#include "esp_log.h"
+
+
+#include "tcp_perf.h"
+
+/*socket*/
+static int server_socket = 0;
+static struct sockaddr_in server_addr;
+static struct sockaddr_in client_addr;
+static unsigned int socklen = sizeof(client_addr);
+static int connect_socket = 0;
+
+int connectedflag = 0;
+int total_data = 0;
+
+#if ESP_TCP_PERF_TX && ESP_TCP_DELAY_INFO
+
+int total_pack = 0;
+int send_success = 0;
+int send_fail = 0;
+int delay_classify[5] = { 0 };
+
+#endif /*ESP_TCP_PERF_TX && ESP_TCP_DELAY_INFO*/
+
+
+static esp_err_t event_handler(void *ctx, system_event_t *event)
+{
+    switch(event->event_id) {
+    case SYSTEM_EVENT_STA_START:
+        esp_wifi_connect();
+        break;
+    case SYSTEM_EVENT_STA_DISCONNECTED:
+        esp_wifi_connect();
+        break;
+    case SYSTEM_EVENT_STA_CONNECTED:
+        break;
+    case SYSTEM_EVENT_STA_GOT_IP:
+    	ESP_LOGI(TAG, "event_handler:SYSTEM_EVENT_STA_GOT_IP!");
+    	ESP_LOGI(TAG, "got ip:%s\n",
+		ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
+        connectedflag = 1;
+        break;
+    case SYSTEM_EVENT_AP_STACONNECTED:
+    	ESP_LOGI(TAG, "station:"MACSTR" join,AID=%d\n",
+		MAC2STR(event->event_info.sta_connected.mac),
+		event->event_info.sta_connected.aid);
+    	connectedflag = 1;
+    	break;
+    case SYSTEM_EVENT_AP_STADISCONNECTED:
+    	ESP_LOGI(TAG, "station:"MACSTR"leave,AID=%d\n",
+		MAC2STR(event->event_info.sta_disconnected.mac),
+		event->event_info.sta_disconnected.aid);
+    	connectedflag = 0;
+    	break;
+    default:
+        break;
+    }
+    return ESP_OK;
+}
+
+//send data
+void send_data(void *pvParameters)
+{
+    int len = 0;
+    char databuff[DEFAULT_PKTSIZE];
+    memset(databuff, PACK_BYTE_IS, DEFAULT_PKTSIZE);
+    vTaskDelay(100/portTICK_RATE_MS);
+    ESP_LOGI(TAG, "start sending...");
+#if ESP_TCP_PERF_TX && ESP_TCP_DELAY_INFO
+    //delaytime
+    struct timeval tv_start;
+    struct timeval tv_finish;
+    unsigned long send_delay_ms;
+#endif /*ESP_TCP_PERF_TX && ESP_TCP_DELAY_INFO*/
+    while(1) {
+
+#if ESP_TCP_PERF_TX && ESP_TCP_DELAY_INFO
+    	total_pack++;
+    	gettimeofday(&tv_start, NULL);
+#endif /*ESP_TCP_PERF_TX && ESP_TCP_DELAY_INFO*/
+    	
+	//send function
+    	len = send(connect_socket, databuff, DEFAULT_PKTSIZE, 0);
+
+#if ESP_TCP_PERF_TX && ESP_TCP_DELAY_INFO
+    	gettimeofday(&tv_finish, NULL);
+#endif /*ESP_TCP_PERF_TX && ESP_TCP_DELAY_INFO*/
+	if(len > 0) {
+	    total_data += len;
+	    
+#if ESP_TCP_PERF_TX && ESP_TCP_DELAY_INFO
+	    send_success++;
+	    send_delay_ms = (tv_finish.tv_sec - tv_start.tv_sec) * 1000
+		+ (tv_finish.tv_usec - tv_start.tv_usec) / 1000;
+	    if(send_delay_ms < 30)
+		delay_classify[0]++;
+	    else if(send_delay_ms < 100)
+		delay_classify[1]++;
+	    else if(send_delay_ms < 300)
+		delay_classify[2]++;
+	    else if(send_delay_ms < 1000)
+		delay_classify[3]++;
+	    else
+		delay_classify[4]++;
+#endif /*ESP_TCP_PERF_TX && ESP_TCP_DELAY_INFO*/
+	
+	}/*if(len > 0)*/
+	else {
+
+#if ESP_TCP_PERF_TX && ESP_TCP_DELAY_INFO
+	    send_fail++;
+#endif /*ESP_TCP_PERF_TX && ESP_TCP_DELAY_INFO*/
+	    
+	    /*Most of the error code will be send window full.
+         *So, for faster sending,don't show error code.
+	     *if it can't work as expectations,unnote the two lines here.
+	     **/
+	    //show_socket_error_code(connect_socket);
+	    //vTaskDelay(500/portTICK_RATE_MS);
+	}
+    } 
+}
+//receive data
+void recv_data(void *pvParameters)
+{
+    int len = 0;
+    char databuff[DEFAULT_PKTSIZE];
+    while (1) {
+	len = recv(connect_socket, databuff, DEFAULT_PKTSIZE, 0);
+	if (len > 0) {
+	    total_data += len;
+	}
+	else {
+	    show_socket_error_code(connect_socket);
+	    vTaskDelay(500 / portTICK_RATE_MS);
+	}
+    }
+}
+
+
+//use this esp32 as a tcp server. return ESP_OK:success ESP_FAIL:error
+esp_err_t create_tcp_server()
+{
+    ESP_LOGI(TAG, "server socket....port=%d\n", DEFAULT_PORT);
+    server_socket = socket(AF_INET, SOCK_STREAM, 0);
+    if (server_socket < 0) {
+    	show_socket_error_code(server_socket);
+	return ESP_FAIL;
+    }
+    server_addr.sin_family = AF_INET;
+    server_addr.sin_port = htons(DEFAULT_PORT);
+    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
+    if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
+    	show_socket_error_code(server_socket);
+	close(server_socket);
+	return ESP_FAIL;
+    }
+    if (listen(server_socket, 5) < 0) {
+    	show_socket_error_code(server_socket);
+	close(server_socket);
+	return ESP_FAIL;
+    }
+    connect_socket = accept(server_socket, (struct sockaddr*)&client_addr, &socklen);
+    if (connect_socket<0) {
+    	show_socket_error_code(connect_socket);
+	close(server_socket);
+	return ESP_FAIL;
+    }
+    /*connection established，now can send/recv*/
+    ESP_LOGI(TAG, "tcp connection established!");
+    return ESP_OK;
+}
+//use this esp32 as a tcp client. return ESP_OK:success ESP_FAIL:error
+esp_err_t create_tcp_client()
+{
+    ESP_LOGI(TAG, "client socket....serverip:port=%s:%d\n", 
+    		DEFAULT_SERVER_IP, DEFAULT_PORT);
+    connect_socket = socket(AF_INET, SOCK_STREAM, 0);
+    if (connect_socket < 0) {
+    	show_socket_error_code(connect_socket);
+	return ESP_FAIL;
+    }
+    server_addr.sin_family = AF_INET;
+    server_addr.sin_port = htons(DEFAULT_PORT);
+    server_addr.sin_addr.s_addr = inet_addr(DEFAULT_SERVER_IP);
+    ESP_LOGI(TAG, "connecting to server...");
+    if (connect(connect_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
+    	show_socket_error_code(connect_socket);
+	return ESP_FAIL;
+    }
+    ESP_LOGI(TAG, "connect to server success!");
+    return ESP_OK;
+}
+
+//wifi_init_sta
+void wifi_init_sta()
+{
+    tcpip_adapter_init();
+    ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL) );
+
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+    wifi_config_t wifi_config = {
+        .sta = {
+            .ssid = DEFAULT_SSID,
+            .password = DEFAULT_PWD
+        },
+    };
+
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
+    ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config) );
+    ESP_ERROR_CHECK(esp_wifi_start() );
+
+    ESP_LOGI(TAG, "wifi_init_sta finished.");
+    ESP_LOGI(TAG, "connect to ap SSID:%s password:%s \n",
+	    DEFAULT_SSID,DEFAULT_PWD);
+}
+//wifi_init_softap
+void wifi_init_softap()
+{
+    tcpip_adapter_init();
+    ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL));
+
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+    wifi_config_t wifi_config = {
+        .ap = {
+            .ssid = DEFAULT_SSID,
+            .ssid_len = 0,
+            .max_connection=MAX_STA_CONN,
+            .password = DEFAULT_PWD,
+            .authmode = WIFI_AUTH_WPA_WPA2_PSK
+        },
+    };
+    if (strlen(DEFAULT_PWD) ==0) {
+	wifi_config.ap.authmode = WIFI_AUTH_OPEN;
+    }
+
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_AP));
+    ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_AP, &wifi_config));
+    ESP_ERROR_CHECK(esp_wifi_start());
+
+    ESP_LOGI(TAG, "wifi_init_softap finished.SSID:%s password:%s \n",
+    	    DEFAULT_SSID, DEFAULT_PWD);
+}
+
+
+
+
+char* tcpip_get_reason(int err)
+{
+    switch (err) {
+	case 0:
+	    return "reason: other reason";
+	case ENOMEM:
+	    return "reason: out of memory";
+	case ENOBUFS:
+	    return "reason: buffer error";
+	case EWOULDBLOCK:
+	    return "reason: timeout, try again";
+	case EHOSTUNREACH:
+	    return "reason: routing problem";
+	case EINPROGRESS:
+	    return "reason: operation in progress";
+	case EINVAL:
+	    return "reason: invalid value";
+	case EADDRINUSE:
+	    return "reason: address in use";
+	case EALREADY:
+	    return "reason: conn already connected";
+	case EISCONN:
+	    return "reason: conn already established";
+	case ECONNABORTED:
+	    return "reason: connection aborted";
+	case ECONNRESET:
+	    return "reason: connection is reset";
+	case ENOTCONN:
+	    return "reason: connection closed";
+	case EIO:
+	    return "reason: invalid argument";
+	case -1:
+	    return "reason: low level netif error";
+	default:
+	    return "reason not found";
+    }
+}
+
+int show_socket_error_code(int socket)
+{
+    int result;
+    u32_t optlen = sizeof(int);
+    getsockopt(socket, SOL_SOCKET, SO_ERROR, &result, &optlen);
+    ESP_LOGI(TAG, "socket error %d reason: %s", result, tcpip_get_reason(result));
+    return result;
+}
+
+int check_socket_error_code()
+{
+    int ret;
+#if ESP_TCP_MODE_SERVER
+    ESP_LOGI(TAG, "check server_socket");
+    ret = show_socket_error_code(server_socket);
+    if(ret == ECONNRESET)
+	return ret;
+#endif
+    ESP_LOGI(TAG, "check connect_socket");
+    ret = show_socket_error_code(connect_socket);
+    if(ret == ECONNRESET)
+	return ret;
+    return 0;
+}
+
+void close_socket()
+{
+    close(connect_socket);
+    close(server_socket);
+}
+
+
diff --git a/examples/performance/tcp_perf/main/tcp_perf.h b/examples/performance/tcp_perf/main/tcp_perf.h
new file mode 100644
index 000000000..e29215b5b
--- /dev/null
+++ b/examples/performance/tcp_perf/main/tcp_perf.h
@@ -0,0 +1,70 @@
+#ifndef __TCP_PERF_H__
+#define __TCP_PERF_H__
+
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*AP info and tcp_server info*/
+#define DEFAULT_SSID CONFIG_TCP_PERF_WIFI_SSID
+#define DEFAULT_PWD CONFIG_TCP_PERF_WIFI_PASSWORD
+#define DEFAULT_PORT CONFIG_TCP_PERF_SERVER_PORT
+#define DEFAULT_SERVER_IP CONFIG_TCP_PERF_SERVER_IP
+#define DEFAULT_PKTSIZE CONFIG_TCP_PERF_PKT_SIZE
+#define MAX_STA_CONN 1 //how many sta can be connected(AP mode)
+/*test options*/
+#define ESP_WIFI_MODE_AP CONFIG_TCP_PERF_WIFI_MODE_AP //TRUE:AP FALSE:STA
+#define ESP_TCP_MODE_SERVER CONFIG_TCP_PERF_SERVER //TRUE:server FALSE:client
+#define ESP_TCP_PERF_TX CONFIG_TCP_PERF_TX //TRUE:send FALSE:receive
+#define ESP_TCP_DELAY_INFO CONFIG_TCP_PERF_DELAY_DEBUG //TRUE:show delay time info
+
+
+#define PACK_BYTE_IS 97 //'a'
+#define TAG "tcp_perf:"
+
+
+extern int connectedflag;
+extern int total_data;
+
+#if ESP_TCP_PERF_TX && ESP_TCP_DELAY_INFO
+extern int total_pack;
+extern int send_success;
+extern int send_fail;
+extern int delay_classify[5];
+#endif/*ESP_TCP_PERF_TX && ESP_TCP_DELAY_INFO*/
+
+
+//using esp as station
+void wifi_init_sta();
+//using esp as softap
+void wifi_init_softap();
+
+//create a tcp server socket. return ESP_OK:success ESP_FAIL:error
+esp_err_t create_tcp_server();
+//create a tcp client socket. return ESP_OK:success ESP_FAIL:error
+esp_err_t create_tcp_client();
+
+//send data task
+void send_data(void *pvParameters);
+//receive data task
+void recv_data(void *pvParameters);
+
+//close all socket
+void close_socket();
+
+//show socket error code. return: error code
+int show_socket_error_code(int socket);
+
+//check working socket
+int check_socket_error_code();
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /*#ifndef __TCP_PERF_H__*/
+
diff --git a/examples/performance/udp_perf/Makefile b/examples/performance/udp_perf/Makefile
new file mode 100644
index 000000000..97d6eaa13
--- /dev/null
+++ b/examples/performance/udp_perf/Makefile
@@ -0,0 +1,9 @@
+#
+# This is a project Makefile. It is assumed the directory this Makefile resides in is a
+# project subdirectory.
+#
+
+PROJECT_NAME := udp_perf
+
+include $(IDF_PATH)/make/project.mk
+
diff --git a/examples/performance/udp_perf/main/Kconfig.projbuild b/examples/performance/udp_perf/main/Kconfig.projbuild
new file mode 100644
index 000000000..72d40cb98
--- /dev/null
+++ b/examples/performance/udp_perf/main/Kconfig.projbuild
@@ -0,0 +1,111 @@
+menu "Example Configuration"
+
+#choice 
+#   prompt "UDP_PERF_MODE "
+#	default MODE_UDP_SHIELDBOX
+#	help
+#	    This option set performance mode.
+#	    
+#	    - Testing in shieldbox for "Performance in shieldbox" setting.
+#		
+#	    - Testing in air for "Performance in air" setting.
+#	    		
+#	    - Testing in long distance for "Performance in long distance" setting.
+#		
+#					
+#config MODE_UDP_SHIELDBOX
+#    bool "Performance in shieldbox"
+#config MODE_UDP_AIR
+#    bool "Performance in air"
+#config MODE_UDP_LONG_DISTANCE
+#    bool "Performance in long distance"
+#endchoice
+#
+
+choice UDP_PERF_WIFI_MODE
+    prompt "AP or STA"
+    default UDP_PERF_ESP_IS_STATION
+    help
+        Whether the esp32 is softAP or station.
+
+config UDP_PERF_ESP_IS_SOFTAP
+    bool "SoftAP"
+config UDP_PERF_ESP_IS_STATION
+    bool "Station"
+endchoice
+
+config UDP_PERF_WIFI_MODE_AP
+    bool
+    default y if UDP_PERF_ESP_IS_SOFTAP
+    default n if UDP_PERF_ESP_IS_STATION
+
+choice UDP_PERF_SERVER_CLIENT
+    prompt "server or client"
+    default UDP_PERF_ESP_IS_CLIENT
+    help
+	Whether the esp32 is tcp server or client.
+		
+	We suggest to choose "client" if you choose "station" in "wifi mode".
+
+config UDP_PERF_ESP_IS_SERVER
+    bool "server"
+config UDP_PERF_ESP_IS_CLIENT
+    bool "client"
+endchoice
+
+config UDP_PERF_SERVER
+    bool
+    default y if UDP_PERF_ESP_IS_SERVER
+    default n if UDP_PERF_ESP_IS_CLIENT
+
+choice UDP_PERF_TX_RX
+    prompt "send or receive"
+    default UDP_PERF_ESP_RECV
+    help
+	Whether the esp32 will send or receive.
+
+config UDP_PERF_ESP_SEND
+    bool "send"
+config UDP_PERF_ESP_RECV
+    bool "receive"
+endchoice
+
+config UDP_PERF_TX
+    bool
+    default y if UDP_PERF_ESP_SEND
+    default n if UDP_PERF_ESP_RECV
+
+
+config UDP_PERF_WIFI_SSID
+    string "WiFi SSID"
+	default "esp_wifi_test1"
+	help
+	    SSID (network name) for the example to connect to.
+
+config UDP_PERF_WIFI_PASSWORD
+    string "WiFi Password"
+	default "1234567890"
+	help
+	    WiFi password (WPA or WPA2) for the example to use.
+		
+config UDP_PERF_SERVER_PORT
+    int "UDP server port"
+	default 4567
+	help 
+	    Which will the udp server use.
+				
+config UDP_PERF_SERVER_IP
+    string "UDP server ip"
+	default "192.168.4.1" 
+	help
+	    IP of UDP server.
+		
+	    Ignore in UDP server.
+	
+config UDP_PERF_PKT_SIZE
+    int "Size of UDP packet"
+	default 1460
+	help
+	    the data send&recv packet size. 
+		
+endmenu
diff --git a/examples/performance/udp_perf/main/component.mk b/examples/performance/udp_perf/main/component.mk
new file mode 100644
index 000000000..61f8990c3
--- /dev/null
+++ b/examples/performance/udp_perf/main/component.mk
@@ -0,0 +1,8 @@
+#
+# Main component makefile.
+#
+# This Makefile can be left empty. By default, it will take the sources in the 
+# src/ directory, compile them and link them into lib(subdirectory_name).a 
+# in the build directory. This behaviour is entirely configurable,
+# please read the ESP-IDF documents if you need to do this.
+#
diff --git a/examples/performance/udp_perf/main/udp_main.c b/examples/performance/udp_perf/main/udp_main.c
new file mode 100644
index 000000000..60f59e9b3
--- /dev/null
+++ b/examples/performance/udp_perf/main/udp_main.c
@@ -0,0 +1,93 @@
+
+
+/*
+udp_perf example
+
+Using this example to test udp throughput performance.
+esp<->esp or esp<->ap
+
+step1:
+    init wifi as AP/STA using config SSID/PASSWORD.
+
+step2:
+    create a udp server/client socket using config PORT/(IP).
+    if server: wating for the first message of client.
+    if client: sending a packet to server first.
+
+step3:
+    send/receive data to/from each other.
+    you can see the info in serial output.
+*/
+
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_log.h"
+#include "esp_err.h"
+
+#include "udp_perf.h"
+
+
+//this task establish a UDP connection and receive data from UDP
+static void udp_conn(void *pvParameters)
+{
+    ESP_LOGI(TAG, "task udp_conn start.");
+    /*wating for connecting to AP*/
+    do
+    {
+	vTaskDelay(100);
+    }
+    while (!connectedflag);
+    ESP_LOGI(TAG, "sta has connected to ap.");
+    
+    /*create udp socket*/
+    int socket_ret;
+    
+#if ESP_UDP_MODE_SERVER
+    vTaskDelay(3000 / portTICK_RATE_MS);
+    ESP_LOGI(TAG, "create_udp_server.");
+    socket_ret=create_udp_server();
+#else /*ESP_UDP_MODE_SERVER*/
+    vTaskDelay(20000 / portTICK_RATE_MS);
+    ESP_LOGI(TAG, "create_udp_client.");
+    socket_ret = create_udp_client();
+#endif
+    if(ESP_FAIL == socket_ret) {
+	ESP_LOGI(TAG, "create udp socket error,stop.");
+	vTaskDelete(NULL);
+    }
+    
+    /*create a task to tx/rx data*/
+    TaskHandle_t tx_rx_task;
+    xTaskCreate(&send_recv_data, "send_recv_data", 4096, NULL, 4, &tx_rx_task);
+
+    int pps;
+    while (1) {
+	total_data = 0;
+	vTaskDelay(3000 / portTICK_RATE_MS);//every 3s
+	pps = total_data / 3;
+
+#if ESP_UDP_PERF_TX
+	ESP_LOGI(TAG, "udp send %d byte per sec! total pack: %d \n", pps, success_pack);
+#else
+	ESP_LOGI(TAG, "udp recv %d byte per sec! total pack: %d \n", pps, success_pack);
+#endif /*ESP_UDP_PERF_TX*/
+    }
+    close_socket();
+    vTaskDelete(tx_rx_task);
+    vTaskDelete(NULL);
+}
+
+
+
+void app_main(void)
+{
+#if ESP_WIFI_MODE_AP
+    ESP_LOGI(TAG, "ESP_WIFI_MODE_AP\n");
+    wifi_init_softap();
+#else /*ESP_WIFI_MODE_AP*/
+    ESP_LOGI(TAG, "ESP_WIFI_MODE_STA\n");
+    wifi_init_sta();
+#endif
+    xTaskCreate(&udp_conn, "udp_conn", 4096, NULL, 5, NULL);
+}
diff --git a/examples/performance/udp_perf/main/udp_perf.c b/examples/performance/udp_perf/main/udp_perf.c
new file mode 100644
index 000000000..22a55ad90
--- /dev/null
+++ b/examples/performance/udp_perf/main/udp_perf.c
@@ -0,0 +1,270 @@
+// Copyright 2013-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <string.h>
+#include <sys/socket.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_wifi.h"
+#include "esp_event_loop.h"
+#include "esp_log.h"
+
+
+#include "udp_perf.h"
+
+
+
+static int mysocket;
+
+static struct sockaddr_in remote_addr;
+static unsigned int socklen;
+
+int connectedflag = 0;
+int total_data = 0;
+int success_pack = 0;
+
+
+static esp_err_t event_handler(void *ctx, system_event_t *event)
+{
+    switch(event->event_id) {
+    case SYSTEM_EVENT_STA_START:
+        esp_wifi_connect();
+        break;
+    case SYSTEM_EVENT_STA_DISCONNECTED:
+        esp_wifi_connect();
+        break;
+    case SYSTEM_EVENT_STA_CONNECTED:
+        break;
+    case SYSTEM_EVENT_STA_GOT_IP:
+    	ESP_LOGI(TAG, "event_handler:SYSTEM_EVENT_STA_GOT_IP!");
+    	ESP_LOGI(TAG, "got ip:%s\n",
+		ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
+        connectedflag=1;
+        break;
+    case SYSTEM_EVENT_AP_STACONNECTED:
+    	ESP_LOGI(TAG, "station:"MACSTR" join,AID=%d\n",
+		MAC2STR(event->event_info.sta_connected.mac),
+		event->event_info.sta_connected.aid);
+    	connectedflag=1;
+    	break;
+    case SYSTEM_EVENT_AP_STADISCONNECTED:
+    	ESP_LOGI(TAG, "station:"MACSTR"leave,AID=%d\n",
+		MAC2STR(event->event_info.sta_disconnected.mac),
+		event->event_info.sta_disconnected.aid);
+    	break;
+    default:
+        break;
+    }
+    return ESP_OK;
+}
+
+
+//wifi_init_sta
+void wifi_init_sta()
+{
+    tcpip_adapter_init();
+    ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL) );
+
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+    wifi_config_t wifi_config = {
+        .sta = {
+            .ssid = DEFAULT_SSID,
+            .password = DEFAULT_PWD
+        },
+    };
+
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
+    ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config) );
+    ESP_ERROR_CHECK(esp_wifi_start() );
+
+    ESP_LOGI(TAG, "wifi_init_sta finished.");
+    ESP_LOGI(TAG, "connect to ap SSID:%s password:%s \n",
+	    DEFAULT_SSID,DEFAULT_PWD);
+}
+//wifi_init_softap
+void wifi_init_softap()
+{
+    tcpip_adapter_init();
+    ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL));
+
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+    wifi_config_t wifi_config = {
+        .ap = {
+            .ssid = DEFAULT_SSID,
+            .ssid_len=0,
+            .max_connection=MAX_STA_CONN,
+            .password = DEFAULT_PWD,
+            .authmode=WIFI_AUTH_WPA_WPA2_PSK
+        },
+    };
+    if (strlen(DEFAULT_PWD) ==0) {
+	wifi_config.ap.authmode = WIFI_AUTH_OPEN;
+    }
+
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_AP));
+    ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_AP, &wifi_config));
+    ESP_ERROR_CHECK(esp_wifi_start());
+
+    ESP_LOGI(TAG, "wifi_init_softap finished.SSID:%s password:%s \n",
+    	    DEFAULT_SSID, DEFAULT_PWD);
+}
+
+//create a udp server socket. return ESP_OK:success ESP_FAIL:error
+esp_err_t create_udp_server()
+{
+    ESP_LOGI(TAG, "create_udp_server()");
+    mysocket = socket(AF_INET, SOCK_DGRAM, 0);
+    if (mysocket < 0) {
+	show_socket_error_code(mysocket);
+	return ESP_FAIL;
+    }
+    struct sockaddr_in server_addr;
+    server_addr.sin_family = AF_INET;
+    server_addr.sin_port = htons(DEFAULT_PORT);
+    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
+    if (bind(mysocket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
+	show_socket_error_code(mysocket);
+	close(mysocket);
+	return ESP_FAIL;
+    }
+    return ESP_OK;
+}
+
+//create a udp client socket. return ESP_OK:success ESP_FAIL:error
+esp_err_t create_udp_client()
+{
+    ESP_LOGI(TAG, "create_udp_client()");
+    mysocket = socket(AF_INET, SOCK_DGRAM, 0);
+    if (mysocket < 0) {
+	show_socket_error_code(mysocket);
+	return ESP_FAIL;
+    }
+    /*for client remote_addr is also server_addr*/
+    remote_addr.sin_family = AF_INET;
+    remote_addr.sin_port = htons(DEFAULT_PORT);
+    remote_addr.sin_addr.s_addr = inet_addr(DEFAULT_SERVER_IP);
+
+    return ESP_OK;
+}
+
+
+//send or recv data task
+void send_recv_data(void *pvParameters)
+{
+    ESP_LOGI(TAG, "task send_recv_data start!\n");
+    
+    int len;
+    char databuff[DEFAULT_PKTSIZE];
+    
+    /*send&receive first packet*/
+    socklen = sizeof(remote_addr);
+    memset(databuff, PACK_BYTE_IS, DEFAULT_PKTSIZE);
+#if ESP_UDP_MODE_SERVER
+    ESP_LOGI(TAG, "first recvfrom:");
+    len = recvfrom(mysocket, databuff, DEFAULT_PKTSIZE, 0, (struct sockaddr *)&remote_addr, &socklen);
+#else
+    ESP_LOGI(TAG, "first sendto:");
+    len = sendto(mysocket, databuff, DEFAULT_PKTSIZE, 0, (struct sockaddr *)&remote_addr, sizeof(remote_addr));
+#endif
+    
+    if (len > 0) {
+	ESP_LOGI(TAG, "transfer data with %s:%u\n",
+		inet_ntoa(remote_addr.sin_addr), ntohs(remote_addr.sin_port));
+    } else {
+	show_socket_error_code(mysocket);
+	close(mysocket);
+	vTaskDelete(NULL);
+    }
+    
+#if ESP_UDP_PERF_TX
+    vTaskDelay(500 / portTICK_RATE_MS);
+#endif
+    ESP_LOGI(TAG, "start count!\n");
+    while(1)
+    {
+	/*you can add delay time for fixed-frequency*/
+	//vTaskDelay(5 / portTICK_RATE_MS);
+#if ESP_UDP_PERF_TX
+	len = sendto(mysocket, databuff, DEFAULT_PKTSIZE, 0, (struct sockaddr *)&remote_addr, sizeof(remote_addr));
+#else
+	len = recvfrom(mysocket, databuff, DEFAULT_PKTSIZE, 0, (struct sockaddr *)&remote_addr, &socklen);
+#endif
+	if (len > 0) {
+	    total_data += len;
+	    success_pack++;
+	} else {
+	    //show_socket_error_code(mysocket);
+	    /*you'd better turn off watch dog in menuconfig
+	     *Component config->ESP32-specific->Task watchdog.
+	     **/
+	    //vTaskDelay(1/portTICK_RATE_MS);
+	}
+    }
+}
+
+
+char* tcpip_get_reason(int err)
+{
+    switch (err) {
+    case 0:
+        return "reason: other reason";
+    case ENOMEM:
+        return "reason: out of memory";
+    case ENOBUFS:
+        return "reason: buffer error";
+    case EWOULDBLOCK:
+        return "reason: timeout, try again";
+    case EHOSTUNREACH:
+        return "reason: routing problem";
+    case EINPROGRESS:
+        return "reason: operation in progress";
+    case EINVAL:
+        return "reason: invalid value";
+    case EADDRINUSE:
+        return "reason: address in use";
+    case EALREADY:
+        return "reason: conn already connected";
+    case EISCONN:
+        return "reason: conn already established";
+    case ECONNABORTED:
+        return "reason: connection aborted";
+    case ECONNRESET:
+        return "reason: connection is reset";
+    case ENOTCONN:
+        return "reason: connection closed";
+    case EIO:
+        return "reason: invalid argument";
+    case -1:
+        return "reason: low level netif error";
+    default:
+        return "reason not found";
+    }
+}
+
+int show_socket_error_code(int socket)
+{
+    int result;
+    u32_t optlen = sizeof(int);
+    getsockopt(socket, SOL_SOCKET, SO_ERROR, &result, &optlen);
+    ESP_LOGI(TAG, "socket error %d reason: %s", result, tcpip_get_reason(result));
+    return result;
+}
+
+
+void close_socket()
+{
+    close(mysocket);
+}
diff --git a/examples/performance/udp_perf/main/udp_perf.h b/examples/performance/udp_perf/main/udp_perf.h
new file mode 100644
index 000000000..0f8221559
--- /dev/null
+++ b/examples/performance/udp_perf/main/udp_perf.h
@@ -0,0 +1,60 @@
+#ifndef __UDP_PERF_H__
+#define __UDP_PERF_H__
+
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*AP info and tcp_server info*/
+#define DEFAULT_SSID CONFIG_UDP_PERF_WIFI_SSID
+#define DEFAULT_PWD CONFIG_UDP_PERF_WIFI_PASSWORD
+#define DEFAULT_PORT CONFIG_UDP_PERF_SERVER_PORT
+#define DEFAULT_SERVER_IP CONFIG_UDP_PERF_SERVER_IP
+#define DEFAULT_PKTSIZE CONFIG_UDP_PERF_PKT_SIZE
+#define MAX_STA_CONN 1 //how many sta can be connected(AP mode)
+/*test options*/
+#define ESP_WIFI_MODE_AP CONFIG_UDP_PERF_WIFI_MODE_AP //TRUE:AP FALSE:STA
+#define ESP_UDP_MODE_SERVER CONFIG_UDP_PERF_SERVER //TRUE:server FALSE:client
+#define ESP_UDP_PERF_TX CONFIG_UDP_PERF_TX //TRUE:send FALSE:receive
+#define PACK_BYTE_IS 97 //'a'
+
+#define TAG "udp_perf:"
+
+
+extern int connectedflag;
+extern int total_data;
+extern int success_pack;
+
+
+//using esp as station
+void wifi_init_sta();
+//using esp as softap
+void wifi_init_softap();
+
+//create a udp server socket. return ESP_OK:success ESP_FAIL:error
+esp_err_t create_udp_server();
+//create a udp client socket. return ESP_OK:success ESP_FAIL:error
+esp_err_t create_udp_client();
+
+//send or recv data task
+void send_recv_data(void *pvParameters);
+
+//show socket error code. return: error code
+int show_socket_error_code(int socket);
+
+//close all socket
+void close_socket();
+
+
+
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /*#ifndef __UDP_PERF_H__*/
+