diff --git a/components/aws_iot/port/network_mbedtls_wrapper.c b/components/aws_iot/port/network_mbedtls_wrapper.c
index be33fdb7..515f6745 100644
--- a/components/aws_iot/port/network_mbedtls_wrapper.c
+++ b/components/aws_iot/port/network_mbedtls_wrapper.c
@@ -99,7 +99,7 @@ IoT_Error_t iot_tls_connect(Network *pNetwork, TLSConnectParams *params) {
         cfg.alpn_protos = alpnProtocols;
     }
 
-    rtc_clk_cpu_freq_set(RTC_CPU_FREQ_160M);
+    esp_set_cpu_freq(ESP_CPU_FREQ_160M);
 
     struct esp_tls *tls = esp_tls_conn_new(pNetwork->tlsConnectParams.pDestinationURL, strlen(pNetwork->tlsConnectParams.pDestinationURL), pNetwork->tlsConnectParams.DestinationPort, &cfg);
 
@@ -110,7 +110,7 @@ IoT_Error_t iot_tls_connect(Network *pNetwork, TLSConnectParams *params) {
     tlsDataParams->timeout = pNetwork->tlsConnectParams.timeout_ms;
     tlsDataParams->handle = (esp_network_handle_t)tls;
 
-    rtc_clk_cpu_freq_set(RTC_CPU_FREQ_80M);
+    esp_set_cpu_freq(ESP_CPU_FREQ_80M);
 
     return (IoT_Error_t) ret;
 }
diff --git a/components/esp8266/CMakeLists.txt b/components/esp8266/CMakeLists.txt
index 36c8ee0d..2a6ba7bc 100644
--- a/components/esp8266/CMakeLists.txt
+++ b/components/esp8266/CMakeLists.txt
@@ -24,6 +24,7 @@ else()
     set(srcs
         "source/chip_boot.c"
         "source/backtrace.c"
+        "source/esp_sleep.c"
         "source/esp_err_to_name.c"
         "source/esp_timer.c"
         "source/esp_wifi_os_adapter.c"
@@ -60,7 +61,7 @@ else()
     target_link_libraries(${COMPONENT_LIB} PUBLIC "-L ${CMAKE_CURRENT_SOURCE_DIR}/lib" "-lstdc++")
 
     if(NOT CONFIG_NO_BLOBS)
-        set(blobs "gcc" "hal" "core" "net80211" "phy" "pp" "smartconfig" "ssc" "wpa" "espnow" "wps")
+        set(blobs "gcc" "hal" "core" "net80211" "phy" "clk" "pp" "smartconfig" "ssc" "wpa" "espnow" "wps")
         foreach(blob ${blobs})
             add_library(${blob} STATIC IMPORTED)
             set_property(TARGET ${blob} PROPERTY IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/lib/lib${blob}.a)
diff --git a/components/esp8266/component.mk b/components/esp8266/component.mk
index 181b36d5..53b0ad2a 100644
--- a/components/esp8266/component.mk
+++ b/components/esp8266/component.mk
@@ -13,10 +13,10 @@ LIBS ?=
 ifndef CONFIG_NO_BLOBS
 ifndef CONFIG_ESP8266_WIFI_DEBUG_LOG_ENABLE
 LIBS += gcc hal core net80211 \
-        phy pp smartconfig ssc wpa espnow wps
+        phy clk pp smartconfig ssc wpa espnow wps
 else
 LIBS += gcc hal core_dbg net80211_dbg \
-        phy pp_dbg smartconfig ssc wpa_dbg espnow_dbg wps_dbg
+        phy clk pp_dbg smartconfig ssc wpa_dbg espnow_dbg wps_dbg
 endif
 endif
 
diff --git a/components/esp8266/include/driver/rtc.h b/components/esp8266/include/driver/rtc.h
new file mode 100644
index 00000000..aaa7e94c
--- /dev/null
+++ b/components/esp8266/include/driver/rtc.h
@@ -0,0 +1,120 @@
+// Copyright 2019-2020 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.
+
+#pragma once
+
+#include <stdint.h>
+#include "esp8266/eagle_soc.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Wakeup option
+ */
+#define RTC_GPIO_TRIG_EN    BIT(2)  //!< GPIO wakeup (light sleep only)
+#define RTC_TIMER_TRIG_EN   BIT(3)  //!< Timer wakeup
+
+/**
+ * @brief CPU frequency values
+ */
+typedef enum {
+    RTC_CPU_FREQ_80M = 0,           //!< 80 MHz
+    RTC_CPU_FREQ_160M = 1,          //!< 160 MHz
+} rtc_cpu_freq_t;
+
+/**
+ * @brief Initialize RTC hardware
+ */
+void rtc_clk_init(void);
+
+/**
+ * @brief Get the currently used CPU frequency configuration
+ *
+ * @return CPU frequency
+ */
+rtc_cpu_freq_t rtc_clk_cpu_freq_get(void);
+
+/**
+ * @brief Switch CPU frequency
+ *
+ * This function sets CPU frequency according to the given configuration
+ * structure. It enables PLLs, if necessary.
+ *
+ * @note This function in not intended to be called by applications in FreeRTOS
+ * environment. This is because it does not adjust various timers based on the
+ * new CPU frequency.
+ *
+ * @param cpu_freq  CPU frequency
+ */
+void rtc_clk_cpu_freq_set(rtc_cpu_freq_t cpu_freq);
+
+/**
+ * @brief Enter light sleep mode
+ * 
+ * @note  CPU wakeup has 2672 ms time cost, so the real sleeping time is to_sleep_time_in_us - 2672
+ *
+ * @param rtc_ticks   value of RTC counter at which wakeup from sleep will happen
+ * 
+ * @param wakeup_opt  bit mask wake up reasons to enable (RTC_xxx_TRIG_EN flags
+ *                    combined with OR)
+ * @param reject_opt  bit mask of sleep reject reasons:
+ *                      - RTC_CNTL_GPIO_REJECT_EN
+ *                      - RTC_CNTL_SDIO_REJECT_EN
+ *                    These flags are used to prevent entering sleep when e.g.
+ *                    an external host is communicating via SDIO slave
+ * @return non-zero if sleep was rejected by hardware
+ */
+uint32_t rtc_light_sleep_start(uint32_t rtc_ticks, uint32_t wakeup_opt, uint32_t reject_opt);
+
+/**
+ * @brief Convert time interval from microseconds to RTC_CLK cycles
+ *
+ * @param time_in_us  Time interval in microseconds
+ * @param period      Period of clock in microseconds (as returned by esp_clk_cal_get)
+ *
+ * @return number of clock cycles
+ */
+uint32_t rtc_time_us_to_clk(uint32_t time_in_us, uint32_t period);
+
+/**
+ * @brief Convert time interval from RTC_CLK to microseconds
+ *
+ * @param rtc_cycles  Time interval in RTC_CLK cycles
+ * @param period      Period of clock in microseconds (as returned by esp_clk_cal_get)
+ *
+ * @return time interval in microseconds
+ */
+uint32_t rtc_time_clk_to_us(uint32_t rtc_cycles, uint32_t period);
+
+/**
+ * @brief Get the calibration value of RTC clock
+ * 
+ * @param xtal_freq  XTAL frequency, unit is MHz
+ *
+ * @return the calibration value
+ */
+uint32_t esp_clk_cal_get(uint32_t xtal_freq);
+
+/**
+ * @brief Get current value of RTC counter
+ *
+ * @return current value of RTC counter
+ */
+uint32_t rtc_time_get(void);
+
+#ifdef __cplusplus
+}
+#endif
diff --git a/components/esp8266/include/esp_sleep.h b/components/esp8266/include/esp_sleep.h
index beee56bf..5dcb5885 100644
--- a/components/esp8266/include/esp_sleep.h
+++ b/components/esp8266/include/esp_sleep.h
@@ -178,6 +178,31 @@ void esp_wifi_enable_gpio_wakeup(uint32_t gpio_num, gpio_int_type_t intr_status)
   */
 void esp_wifi_disable_gpio_wakeup(void);
 
+/**
+ * @brief Enable wakeup by timer
+ * @param time_in_us  time before wakeup, in microseconds
+ * @return
+ *      - ESP_OK on success
+ *      - ESP_ERR_INVALID_ARG if value is out of range (TBD)
+ */
+esp_err_t esp_sleep_enable_timer_wakeup(uint32_t time_in_us);
+
+/**
+ * @brief Enter light sleep with the configured wakeup options
+ *
+ * @return
+ *  - ESP_OK on success (returned after wakeup)
+ *  - ESP_ERR_INVALID_STATE if WiFi or BT is not stopped
+ */
+esp_err_t esp_light_sleep_start(void);
+
+/**
+ * @brief Operation system start check time and enter sleep
+ * 
+ * @note This function is called by system, user should not call this
+ */
+void esp_sleep_start(void);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/components/esp8266/include/esp_system.h b/components/esp8266/include/esp_system.h
index 7d052b5a..e8e6b4c3 100644
--- a/components/esp8266/include/esp_system.h
+++ b/components/esp8266/include/esp_system.h
@@ -123,9 +123,9 @@ esp_err_t esp_derive_local_mac(uint8_t* local_mac, const uint8_t* universal_mac)
  * @brief CPU frequency values
  */
 typedef enum {
-    RTC_CPU_FREQ_80M = 1,       //!< 80 MHz
-    RTC_CPU_FREQ_160M = 2,      //!< 160 MHz
-} rtc_cpu_freq_t;
+    ESP_CPU_FREQ_80M = 1,       //!< 80 MHz
+    ESP_CPU_FREQ_160M = 2,      //!< 160 MHz
+} esp_cpu_freq_t;
 
 /**
  * @brief Switch CPU frequency
@@ -137,7 +137,7 @@ typedef enum {
  *
  * @param cpu_freq  new CPU frequency
  */
-void rtc_clk_cpu_freq_set(rtc_cpu_freq_t cpu_freq);
+void esp_set_cpu_freq(esp_cpu_freq_t cpu_freq);
 
 /**
   * @brief  Reset to default settings.
diff --git a/components/esp8266/lib/VERSION b/components/esp8266/lib/VERSION
index 919f4e77..98b39cc0 100644
--- a/components/esp8266/lib/VERSION
+++ b/components/esp8266/lib/VERSION
@@ -1,10 +1,10 @@
 gwen:
-    core:       7f8c705
+    core:       f467b5d
     net80211:   7f8c705
     pp:         7f8c705
-    wpa:        7f8c705
+    wpa:        f467b5d
     espnow:     7f8c705
     wps:        7f8c705
 
-    smartconfig:  2.8.1
+    smartconfig:  2.8.2
     phy:         1055_22
diff --git a/components/esp8266/lib/libclk.a b/components/esp8266/lib/libclk.a
new file mode 100644
index 00000000..e8542b1b
Binary files /dev/null and b/components/esp8266/lib/libclk.a differ
diff --git a/components/esp8266/lib/libcore.a b/components/esp8266/lib/libcore.a
index 3fb58124..8bbc0bde 100644
Binary files a/components/esp8266/lib/libcore.a and b/components/esp8266/lib/libcore.a differ
diff --git a/components/esp8266/lib/libcore_dbg.a b/components/esp8266/lib/libcore_dbg.a
index 072cf685..9c6bf691 100644
Binary files a/components/esp8266/lib/libcore_dbg.a and b/components/esp8266/lib/libcore_dbg.a differ
diff --git a/components/esp8266/lib/libsmartconfig.a b/components/esp8266/lib/libsmartconfig.a
index b29f331b..039759dc 100644
Binary files a/components/esp8266/lib/libsmartconfig.a and b/components/esp8266/lib/libsmartconfig.a differ
diff --git a/components/esp8266/lib/libwpa.a b/components/esp8266/lib/libwpa.a
index e6ff4023..c1fcec88 100644
Binary files a/components/esp8266/lib/libwpa.a and b/components/esp8266/lib/libwpa.a differ
diff --git a/components/esp8266/lib/libwpa_dbg.a b/components/esp8266/lib/libwpa_dbg.a
index 304b8dd0..a9f587c3 100644
Binary files a/components/esp8266/lib/libwpa_dbg.a and b/components/esp8266/lib/libwpa_dbg.a differ
diff --git a/components/esp8266/linker.lf b/components/esp8266/linker.lf
index fdd63250..5cb19c78 100644
--- a/components/esp8266/linker.lf
+++ b/components/esp8266/linker.lf
@@ -14,3 +14,8 @@ entries:
 archive: libphy.a
 entries:
     * (noflash_text)
+
+[mapping:rtc]
+archive: librtc_opensource.a
+entries:
+    * (noflash_text)
diff --git a/components/esp8266/source/esp_sleep.c b/components/esp8266/source/esp_sleep.c
new file mode 100644
index 00000000..9ef654df
--- /dev/null
+++ b/components/esp8266/source/esp_sleep.c
@@ -0,0 +1,156 @@
+// Copyright 2019-2020 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 <sys/param.h>
+#include "esp_timer.h"
+#include "esp_log.h"
+#include "esp_attr.h"
+#include "esp_system.h"
+#include "esp_sleep.h"
+#include "FreeRTOS.h"
+#include "freertos/task.h"
+#include "driver/soc.h"
+#include "esp8266/timer_struct.h"
+#include "esp8266/uart_struct.h"
+#include "esp8266/rom_functions.h"
+#include "driver/rtc.h"
+
+
+#define MIN_SLEEP_US            (3 * 1000)
+#define WAKEUP_EARLY_US         (2520)
+
+#define TAG                     "esp8266_pm"
+
+typedef struct pm_soc_clk {
+    uint32_t    ccount;
+} pm_soc_clk_t;
+
+static uint32_t s_lock_cnt = 1;
+static uint32_t s_sleep_wakup_triggers;
+static uint32_t s_sleep_duration;
+
+static inline uint32_t save_local_wdev(void)
+{
+    extern uint32_t WDEV_INTEREST_EVENT;
+
+    uint32_t reg = WDEV_INTEREST_EVENT;
+
+    REG_WRITE(INT_ENA_WDEV, WDEV_TSF0_REACH_INT);
+
+    return reg;
+}
+
+static inline void restore_local_wdev(uint32_t reg)
+{
+    REG_WRITE(INT_ENA_WDEV, reg);
+}
+
+static inline void save_soc_clk(pm_soc_clk_t *clk)
+{
+    clk->ccount = soc_get_ccount();
+}
+
+static inline uint32_t min_sleep_us(pm_soc_clk_t *clk)
+{
+    const int32_t os_sleep_us = ((int32_t)soc_get_ccompare() - (int32_t)clk->ccount) / g_esp_ticks_per_us +
+                                        prvGetExpectedIdleTime() * portTICK_RATE_MS * 1000;
+    const uint32_t ccompare_sleep_us = os_sleep_us > 0 ? os_sleep_us : 0;
+
+    return MIN(ccompare_sleep_us, ccompare_sleep_us);
+}
+
+static inline void update_soc_clk(pm_soc_clk_t *clk, uint32_t us)
+{
+    const uint32_t os_ccount = us * g_esp_ticks_per_us + clk->ccount;
+
+    if (os_ccount >= _xt_tick_divisor) 
+        soc_set_ccompare(os_ccount + 32);
+    soc_set_ccount(os_ccount);
+}
+
+esp_err_t esp_sleep_enable_timer_wakeup(uint32_t time_in_us)
+{
+    if (time_in_us <= MIN_SLEEP_US)
+        return ESP_ERR_INVALID_ARG;
+
+    s_sleep_duration = time_in_us;
+    s_sleep_wakup_triggers |= RTC_TIMER_TRIG_EN;
+
+    return ESP_OK;
+}
+
+esp_err_t esp_light_sleep_start(void)
+{
+    const uint32_t rtc_cal = esp_clk_cal_get(CRYSTAL_USED);
+    const uint32_t sleep_rtc_ticks = rtc_time_us_to_clk(s_sleep_duration - WAKEUP_EARLY_US, rtc_cal);
+    const rtc_cpu_freq_t cpu_freq = rtc_clk_cpu_freq_get();
+
+    rtc_light_sleep_start(sleep_rtc_ticks, s_sleep_wakup_triggers, 0);
+
+    rtc_clk_init();
+    rtc_clk_cpu_freq_set(cpu_freq);
+
+    return ESP_OK; 
+}
+
+void esp_sleep_lock(void)
+{
+    const esp_irqflag_t irqflag = soc_save_local_irq();
+    s_lock_cnt++;
+    soc_restore_local_irq(irqflag);
+}
+
+void esp_sleep_unlock(void)
+{
+    const esp_irqflag_t irqflag = soc_save_local_irq();
+    s_lock_cnt--;
+    soc_restore_local_irq(irqflag);
+}
+
+void IRAM_ATTR esp_sleep_start(void)
+{
+    if (s_lock_cnt) {
+        soc_wait_int();
+        return ;
+    }
+
+    int slept = 0;
+    pm_soc_clk_t clk;
+    const esp_irqflag_t irqflag = soc_save_local_irq();
+    const uint32_t wdevflag = save_local_wdev();
+
+    save_soc_clk(&clk);
+
+    const uint32_t sleep_us = min_sleep_us(&clk);
+    if (sleep_us > MIN_SLEEP_US) {
+        const uint32_t rtc_cal = esp_clk_cal_get(CRYSTAL_USED);
+        const uint32_t sleep_rtc_ticks = rtc_time_us_to_clk(sleep_us - WAKEUP_EARLY_US, rtc_cal);
+        const rtc_cpu_freq_t cpu_freq = rtc_clk_cpu_freq_get();
+
+        rtc_light_sleep_start(sleep_rtc_ticks, s_sleep_wakup_triggers | RTC_TIMER_TRIG_EN, 0);
+
+        rtc_clk_init();
+        rtc_clk_cpu_freq_set(cpu_freq);   
+
+        update_soc_clk(&clk, sleep_us);
+
+        slept = 1;
+    }
+
+    restore_local_wdev(wdevflag);
+    soc_restore_local_irq(irqflag);
+
+    if (!slept)
+        soc_wait_int();
+}
diff --git a/components/esp8266/source/esp_timer.c b/components/esp8266/source/esp_timer.c
index 645f9379..4795a36d 100644
--- a/components/esp8266/source/esp_timer.c
+++ b/components/esp8266/source/esp_timer.c
@@ -200,9 +200,9 @@ esp_err_t esp_timer_delete(esp_timer_handle_t timer)
     return os_ret == pdPASS ? ESP_OK : ESP_ERR_INVALID_STATE; 
 }
 
-int64_t esp_timer_get_time()
+int64_t esp_timer_get_time(void)
 {
     extern uint64_t g_esp_os_us;
 
-    return (int64_t)g_esp_os_us;
+    return (int64_t)(g_esp_os_us + soc_get_ccount() / g_esp_ticks_per_us);
 }
diff --git a/components/esp8266/source/startup.c b/components/esp8266/source/startup.c
index 431741af..0b8ed07f 100644
--- a/components/esp8266/source/startup.c
+++ b/components/esp8266/source/startup.c
@@ -117,7 +117,7 @@ static void user_init_entry(void *param)
 #endif
 
 #ifdef CONFIG_ESP8266_DEFAULT_CPU_FREQ_160
-    rtc_clk_cpu_freq_set(RTC_CPU_FREQ_160M);
+    esp_set_cpu_freq(ESP_CPU_FREQ_160M);
 #endif
 
     app_main();
diff --git a/components/freertos/port/esp8266/include/freertos/portmacro.h b/components/freertos/port/esp8266/include/freertos/portmacro.h
index 4abc6267..83f33b4b 100644
--- a/components/freertos/port/esp8266/include/freertos/portmacro.h
+++ b/components/freertos/port/esp8266/include/freertos/portmacro.h
@@ -208,6 +208,15 @@ void esp_increase_tick_cnt(const TickType_t ticks);
 extern void esp_vApplicationIdleHook( void );
 extern void esp_vApplicationTickHook( void );
 
+extern const uint32_t g_esp_ticks_per_us;
+
+/*
+ * @brief Get FreeRTOS system idle ticks
+ *
+ * @return idle ticks
+ */
+TickType_t prvGetExpectedIdleTime(void);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/components/freertos/port/esp8266/port.c b/components/freertos/port/esp8266/port.c
index 830bc1dc..10e0c492 100644
--- a/components/freertos/port/esp8266/port.c
+++ b/components/freertos/port/esp8266/port.c
@@ -41,6 +41,8 @@
 
 #include "esp_attr.h"
 #include "esp_libc.h"
+#include "esp_task_wdt.h"
+#include "esp_sleep.h"
 
 #include "esp8266/eagle_soc.h"
 #include "rom/ets_sys.h"
@@ -151,13 +153,9 @@ void IRAM_ATTR xPortSysTickHandle(void *p)
      *
      * So add code here to calibrate system time.
      */
-    if (_xt_tick_divisor == (CPU_FREQ_80MHz / XT_TICK_PER_SEC)) {
-        ccount = soc_get_ccount();
-        us = ccount / CPU_80M_TICKS_PRT_US;
-    } else {
-        ccount = soc_get_ccount();
-        us = ccount / CPU_160M_TICKS_PRT_US;
-    }
+    ccount = soc_get_ccount();
+    us = ccount / g_esp_ticks_per_us;
+  
     g_esp_os_us += us;
     g_esp_os_cpu_clk += ccount;
 
@@ -166,7 +164,6 @@ void IRAM_ATTR xPortSysTickHandle(void *p)
 
     ticks = us / 1000 / portTICK_PERIOD_MS;
     if (!ticks) {
-        ets_printf("\r\nERROR: CCOMPARE timer period");
         ticks = 1;
     }
 
diff --git a/components/log/log.c b/components/log/log.c
index 13599c7f..264df9ba 100644
--- a/components/log/log.c
+++ b/components/log/log.c
@@ -63,7 +63,7 @@ uint32_t IRAM_ATTR esp_log_early_timestamp()
     extern uint64_t g_esp_os_us;
     extern uint64_t g_esp_boot_ccount;
 
-    const uint32_t ticks_per_ms = _xt_tick_divisor * configTICK_RATE_HZ / 1000;
+    const uint32_t ticks_per_ms = g_esp_ticks_per_us * 1000;
     const uint32_t ms = g_esp_os_us / 1000 + g_esp_boot_ccount / ((CRYSTAL_USED * 2) * 1000);
 #else
     const uint32_t ticks_per_ms = ((CRYSTAL_USED * 2) * 1000);
diff --git a/components/ssl/mbedtls/port/openssl/include/platform/ssl_port.h b/components/ssl/mbedtls/port/openssl/include/platform/ssl_port.h
index dbee9fd3..49ae231b 100644
--- a/components/ssl/mbedtls/port/openssl/include/platform/ssl_port.h
+++ b/components/ssl/mbedtls/port/openssl/include/platform/ssl_port.h
@@ -32,8 +32,8 @@
 #define ssl_memcpy memcpy
 #define ssl_strlen strlen
 
-#define ssl_speed_up_enter() rtc_clk_cpu_freq_set(RTC_CPU_FREQ_160M)
-#define ssl_speed_up_exit()  rtc_clk_cpu_freq_set(RTC_CPU_FREQ_80M)
+#define ssl_speed_up_enter() esp_set_cpu_freq(ESP_CPU_FREQ_160M)
+#define ssl_speed_up_exit()  esp_set_cpu_freq(ESP_CPU_FREQ_80M)
 
 #define SSL_DEBUG_LOG printf