diff --git a/components/log/include/esp_log.h b/components/log/include/esp_log.h
index 6fda8d605..6a9550046 100644
--- a/components/log/include/esp_log.h
+++ b/components/log/include/esp_log.h
@@ -95,6 +95,29 @@ uint32_t esp_log_early_timestamp(void);
  */
 void esp_log_write(esp_log_level_t level, const char* tag, const char* format, ...) __attribute__ ((format (printf, 3, 4)));
 
+/**
+ * @brief Log a buffer of hex bytes at Info level
+ *
+ * @param  tag      description tag
+ *
+ * @param  buffer   Pointer to the buffer array
+ *
+ * @param  buff_len length of buffer
+ *
+ */
+void esp_log_buffer_hex(const char *tag, const char *buffer, uint16_t buff_len);
+
+/**
+ * @brief Log a buffer of characters at Info level. Buffer should contain only printable characters.
+ *
+ * @param  tag      description tag
+ *
+ * @param  buffer   Pointer to the buffer array
+ *
+ * @param  buff_len length of buffer
+ *
+ */
+void esp_log_buffer_char(const char *tag, const char *buffer, uint16_t buff_len);
 
 #if CONFIG_LOG_COLORS
 #define LOG_COLOR_BLACK   "30"
diff --git a/components/log/log.c b/components/log/log.c
index 3826e173b..26d58b228 100644
--- a/components/log/log.c
+++ b/components/log/log.c
@@ -54,6 +54,8 @@
 #include <assert.h>
 #include "esp_log.h"
 
+//print number of bytes per line for esp_log_buffer_char and esp_log_buffer_hex
+#define BYTES_PER_LINE 16
 
 #ifndef BOOTLOADER_BUILD
 
@@ -316,3 +318,31 @@ uint32_t IRAM_ATTR esp_log_timestamp()
 uint32_t esp_log_timestamp() __attribute__((alias("esp_log_early_timestamp")));
 
 #endif //BOOTLOADER_BUILD
+
+void esp_log_buffer_hex(const char *tag, const char *buffer, uint16_t buff_len)
+{
+    char temp_buffer[3*BYTES_PER_LINE + 1]= {0};
+    int line_len = 0;
+    for (int i = 0; i < buff_len; i++) {
+        line_len += sprintf(temp_buffer+line_len, "%02x ", buffer[i]);
+        if (((i + 1) % BYTES_PER_LINE == 0) || (i == buff_len - 1)) {
+            ESP_LOGI(tag, "%s", temp_buffer);
+            line_len = 0;
+            temp_buffer[0] = 0;
+        }
+    }
+}
+
+void esp_log_buffer_char(const char *tag, const char *buffer, uint16_t buff_len)
+{
+    char temp_buffer[2*BYTES_PER_LINE + 1] = {0};
+    int line_len = 0;
+    for (int i = 0; i < buff_len; i++) {
+        line_len += sprintf(temp_buffer+line_len, "%c ", buffer[i]);
+        if (((i + 1) % BYTES_PER_LINE == 0) || (i == buff_len - 1)) {
+            ESP_LOGI(tag, "%s", temp_buffer);
+            line_len = 0;
+            temp_buffer[0] = 0;
+        }
+    }
+}
diff --git a/docs/api-reference/system/log.rst b/docs/api-reference/system/log.rst
index 8aadeac09..4ea0335e9 100644
--- a/docs/api-reference/system/log.rst
+++ b/docs/api-reference/system/log.rst
@@ -55,7 +55,10 @@ Functions
 .. doxygenfunction:: esp_log_level_set
 .. doxygenfunction:: esp_log_set_vprintf
 .. doxygenfunction:: esp_log_timestamp
+.. doxygenfunction:: esp_log_early_timestamp
 .. doxygenfunction:: esp_log_write
+.. doxygenfunction:: esp_log_buffer_hex
+.. doxygenfunction:: esp_log_buffer_char
 
 
 
diff --git a/examples/bluetooth/gatt_server/main/gatts_demo.c b/examples/bluetooth/gatt_server/main/gatts_demo.c
index f36206b79..8bcbde7a0 100644
--- a/examples/bluetooth/gatt_server/main/gatts_demo.c
+++ b/examples/bluetooth/gatt_server/main/gatts_demo.c
@@ -53,6 +53,8 @@ static void gatts_profile_b_event_handler(esp_gatts_cb_event_t event, esp_gatt_i
 
 #define GATTS_DEMO_CHAR_VAL_LEN_MAX 0x40
 
+#define PREPARE_BUF_MAX_SIZE 1024
+
 uint8_t char1_str[] = {0x11,0x22,0x33};
 esp_attr_value_t gatts_demo_char1_val = 
 {
@@ -139,6 +141,17 @@ static struct gatts_profile_inst gl_profile_tab[PROFILE_NUM] = {
     },
 };
 
+typedef struct {
+    uint8_t                 *prepare_buf;
+    int                     prepare_len;
+} prepare_type_env_t;
+
+static prepare_type_env_t a_prepare_write_env;
+static prepare_type_env_t b_prepare_write_env;
+
+void example_write_event_env(esp_gatt_if_t gatts_if, prepare_type_env_t *prepare_write_env, esp_ble_gatts_cb_param_t *param);
+void example_exec_write_event_env(prepare_type_env_t *prepare_write_env, esp_ble_gatts_cb_param_t *param);
+
 static void gap_event_handler(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param_t *param)
 {
     switch (event) {
@@ -170,6 +183,63 @@ static void gap_event_handler(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_param
     }
 }
 
+void example_write_event_env(esp_gatt_if_t gatts_if, prepare_type_env_t *prepare_write_env, esp_ble_gatts_cb_param_t *param){
+    esp_gatt_status_t status = ESP_GATT_OK;
+    if (param->write.need_rsp){
+        if (param->write.is_prep){
+            if (prepare_write_env->prepare_buf == NULL) {
+                prepare_write_env->prepare_buf = (uint8_t *)malloc(PREPARE_BUF_MAX_SIZE*sizeof(uint8_t));
+                prepare_write_env->prepare_len = 0;
+                if (prepare_write_env->prepare_buf == NULL) {
+                    LOG_ERROR("Gatt_server prep no mem\n");
+                    status = ESP_GATT_NO_RESOURCES;
+                }
+            } else {
+                if(param->write.offset > PREPARE_BUF_MAX_SIZE) {
+                    status = ESP_GATT_INVALID_OFFSET;
+                } else if ((param->write.offset + param->write.len) > PREPARE_BUF_MAX_SIZE) {
+                    status = ESP_GATT_INVALID_ATTR_LEN;
+                }
+            }
+
+            esp_gatt_rsp_t *gatt_rsp = (esp_gatt_rsp_t *)malloc(sizeof(esp_gatt_rsp_t));
+            gatt_rsp->attr_value.len = param->write.len;
+            gatt_rsp->attr_value.handle = param->write.handle;
+            gatt_rsp->attr_value.offset = param->write.offset;
+            gatt_rsp->attr_value.auth_req = ESP_GATT_AUTH_REQ_NONE;
+            memcpy(gatt_rsp->attr_value.value, param->write.value, param->write.len);
+            esp_err_t response_err = esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, status, gatt_rsp);
+            if (response_err != ESP_OK){
+               LOG_ERROR("Send response error\n");
+            }
+            free(gatt_rsp);
+            if (status != ESP_GATT_OK){
+                return;
+            }
+            memcpy(prepare_write_env->prepare_buf + param->write.offset,
+                   param->write.value,
+                   param->write.len);
+            prepare_write_env->prepare_len += param->write.len;
+
+        }else{
+            esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, status, NULL);
+        }
+    }
+}
+
+void example_exec_write_event_env(prepare_type_env_t *prepare_write_env, esp_ble_gatts_cb_param_t *param){
+    if (param->exec_write.exec_write_flag == ESP_GATT_PREP_WRITE_EXEC){
+        esp_log_buffer_hex(GATTS_TAG, (char *)prepare_write_env->prepare_buf, prepare_write_env->prepare_len);
+    }else{
+        ESP_LOGI(GATTS_TAG,"ESP_GATT_PREP_WRITE_CANCEL");
+    }
+    if (prepare_write_env->prepare_buf) {
+        free(prepare_write_env->prepare_buf);
+        prepare_write_env->prepare_buf = NULL;
+    }
+    prepare_write_env->prepare_len = 0;
+}
+
 static void gatts_profile_a_event_handler(esp_gatts_cb_event_t event, esp_gatt_if_t gatts_if, esp_ble_gatts_cb_param_t *param) {
     switch (event) {
     case ESP_GATTS_REG_EVT:
@@ -205,10 +275,14 @@ static void gatts_profile_a_event_handler(esp_gatts_cb_event_t event, esp_gatt_i
     case ESP_GATTS_WRITE_EVT: {
         ESP_LOGI(GATTS_TAG, "GATT_WRITE_EVT, conn_id %d, trans_id %d, handle %d\n", param->write.conn_id, param->write.trans_id, param->write.handle);
         ESP_LOGI(GATTS_TAG, "GATT_WRITE_EVT, value len %d, value %08x\n", param->write.len, *(uint32_t *)param->write.value);
-        esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, ESP_GATT_OK, NULL);
+        example_write_event_env(gatts_if, &a_prepare_write_env, param);
         break;
     }
     case ESP_GATTS_EXEC_WRITE_EVT:
+        ESP_LOGI(GATTS_TAG,"ESP_GATTS_EXEC_WRITE_EVT");
+        esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, ESP_GATT_OK, NULL);
+        example_exec_write_event_env(&a_prepare_write_env, param);
+        break;
     case ESP_GATTS_MTU_EVT:
     case ESP_GATTS_CONF_EVT:
     case ESP_GATTS_UNREG_EVT:
@@ -308,10 +382,14 @@ static void gatts_profile_b_event_handler(esp_gatts_cb_event_t event, esp_gatt_i
     case ESP_GATTS_WRITE_EVT: {
         ESP_LOGI(GATTS_TAG, "GATT_WRITE_EVT, conn_id %d, trans_id %d, handle %d\n", param->write.conn_id, param->write.trans_id, param->write.handle);
         ESP_LOGI(GATTS_TAG, "GATT_WRITE_EVT, value len %d, value %08x\n", param->write.len, *(uint32_t *)param->write.value);
-        esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, ESP_GATT_OK, NULL);
+        example_write_event_env(gatts_if, &b_prepare_write_env, param);
         break;
     }
     case ESP_GATTS_EXEC_WRITE_EVT:
+        ESP_LOGI(GATTS_TAG,"ESP_GATTS_EXEC_WRITE_EVT");
+        esp_ble_gatts_send_response(gatts_if, param->write.conn_id, param->write.trans_id, ESP_GATT_OK, NULL);
+        example_exec_write_event_env(&b_prepare_write_env, param);
+        break;
     case ESP_GATTS_MTU_EVT:
     case ESP_GATTS_CONF_EVT:
     case ESP_GATTS_UNREG_EVT: