diff --git a/arduino/libretuya/compat/md5.h b/arduino/libretuya/compat/md5.h
new file mode 100644
index 0000000..63b9c8a
--- /dev/null
+++ b/arduino/libretuya/compat/md5.h
@@ -0,0 +1,6 @@
+/* Copyright (c) Kuba Szczodrzyński 2022-06-04. */
+
+#pragma once
+
+// lowercase "md5.h" to allow including actual MD5.h on case-sensitive OSes
+#include <MD5.h>
diff --git a/arduino/libretuya/core/LibreTuyaAPI.h b/arduino/libretuya/core/LibreTuyaAPI.h
index 0347729..4d72540 100644
--- a/arduino/libretuya/core/LibreTuyaAPI.h
+++ b/arduino/libretuya/core/LibreTuyaAPI.h
@@ -15,6 +15,7 @@
 #define LT_BOARD_STR	   STRINGIFY_MACRO(LT_BOARD)
 
 // Includes
+#include "LibreTuyaCompat.h"
 #include "LibreTuyaConfig.h"
 #include <Arduino.h>
 
@@ -39,10 +40,6 @@ extern "C" {
 		"LibreTuya v" LT_VERSION_STR " on " LT_BOARD_STR ", compiled at " __DATE__ " " __TIME__                        \
 	)
 
-// ArduinoCore-API doesn't define these anymore
-#define FPSTR(pstr_pointer) (reinterpret_cast<const __FlashStringHelper *>(pstr_pointer))
-#define PGM_VOID_P			const void *
-
 void lt_rand_bytes(uint8_t *buf, size_t len);
 
 #ifdef __cplusplus
diff --git a/arduino/libretuya/core/LibreTuyaCompat.cpp b/arduino/libretuya/core/LibreTuyaCompat.cpp
new file mode 100644
index 0000000..203f390
--- /dev/null
+++ b/arduino/libretuya/core/LibreTuyaCompat.cpp
@@ -0,0 +1,33 @@
+/* Copyright (c) Kuba Szczodrzyński 2022-06-04. */
+
+#include "LibreTuyaCompat.h"
+
+#if LT_HAS_FREERTOS
+BaseType_t xTaskCreateUniversal(
+	TaskFunction_t pxTaskCode,
+	const char *const pcName,
+	const uint32_t usStackDepth,
+	void *const pvParameters,
+	UBaseType_t uxPriority,
+	TaskHandle_t *const pxCreatedTask,
+	const BaseType_t xCoreID
+) {
+	// #ifndef CONFIG_FREERTOS_UNICORE
+	// 	if (xCoreID >= 0 && xCoreID < 2) {
+	// 		return xTaskCreatePinnedToCore(
+	// 			pxTaskCode,
+	// 			pcName,
+	// 			usStackDepth,
+	// 			pvParameters,
+	// 			uxPriority,
+	// 			pxCreatedTask,
+	// 			xCoreID
+	// 		);
+	// 	} else {
+	// #endif
+	return xTaskCreate(pxTaskCode, pcName, usStackDepth, pvParameters, uxPriority, pxCreatedTask);
+	// #ifndef CONFIG_FREERTOS_UNICORE
+	// 	}
+	// #endif
+}
+#endif
diff --git a/arduino/libretuya/core/LibreTuyaCompat.h b/arduino/libretuya/core/LibreTuyaCompat.h
new file mode 100644
index 0000000..564d0a7
--- /dev/null
+++ b/arduino/libretuya/core/LibreTuyaCompat.h
@@ -0,0 +1,39 @@
+/* Copyright (c) Kuba Szczodrzyński 2022-06-04. */
+
+#pragma once
+
+#include <Arduino.h>
+
+#if LT_HAS_FREERTOS
+#include <FreeRTOS.h>
+#include <task.h>
+#endif
+
+// Definitions for error constants.
+#define esp_err_t int
+#define ESP_OK	  0	 /*!< esp_err_t value indicating success (no error) */
+#define ESP_FAIL  -1 /*!< Generic esp_err_t code indicating failure */
+
+// ArduinoCore-API doesn't define these anymore
+#define FPSTR(pstr_pointer) (reinterpret_cast<const __FlashStringHelper *>(pstr_pointer))
+#define PGM_VOID_P			const void *
+#define vsnprintf_P			vsnprintf
+
+// FreeRTOS utilities
+#if LT_HAS_FREERTOS
+// if xCoreID < 0 or CPU is unicore, it will use xTaskCreate, else xTaskCreatePinnedToCore
+// allows to easily handle all possible situations without repetitive code
+BaseType_t xTaskCreateUniversal(
+	TaskFunction_t pxTaskCode,
+	const char *const pcName,
+	const uint32_t usStackDepth,
+	void *const pvParameters,
+	UBaseType_t uxPriority,
+	TaskHandle_t *const pxCreatedTask,
+	const BaseType_t xCoreID
+);
+#define xTaskCreatePinnedToCore xTaskCreateUniversal
+#endif
+
+// Default values from sdkconfig.h
+#define CONFIG_LWIP_MAX_ACTIVE_TCP 16
diff --git a/arduino/libretuya/core/lt_logger.h b/arduino/libretuya/core/lt_logger.h
index 3199da1..9765317 100644
--- a/arduino/libretuya/core/lt_logger.h
+++ b/arduino/libretuya/core/lt_logger.h
@@ -81,6 +81,8 @@ void lt_log(const uint8_t level, const char *format, ...);
 #define ESP_EARLY_LOGI(...) LT_I(__VA_ARGS__)
 #define ESP_EARLY_LOGW(...) LT_W(__VA_ARGS__)
 #define ESP_EARLY_LOGE(...) LT_E(__VA_ARGS__)
+#define ets_printf(...)		LT_I(__VA_ARGS__)
+#define ETS_PRINTF(...)		LT_I(__VA_ARGS__)
 
 #define LT_T_MOD(module, ...)                                                                                          \
 	do {                                                                                                               \
diff --git a/arduino/libretuya/libraries/MD5/MD5.h b/arduino/libretuya/libraries/MD5/MD5.h
index ea0c98f..593d72a 100644
--- a/arduino/libretuya/libraries/MD5/MD5.h
+++ b/arduino/libretuya/libraries/MD5/MD5.h
@@ -18,6 +18,9 @@ extern "C" {
 #define LT_MD5_CTX_T void
 #endif
 
+// for compatibility with ESP8266
+typedef LT_MD5_CTX_T md5_context_t;
+
 void MD5Init(LT_MD5_CTX_T *context);
 void MD5Update(LT_MD5_CTX_T *context, const unsigned char *buf, unsigned len);
 void MD5Final(unsigned char digest[16], LT_MD5_CTX_T *context);
diff --git a/builder/frameworks/realtek-ambz-arduino.py b/builder/frameworks/realtek-ambz-arduino.py
index 139a34e..825a7ad 100644
--- a/builder/frameworks/realtek-ambz-arduino.py
+++ b/builder/frameworks/realtek-ambz-arduino.py
@@ -49,11 +49,6 @@ env.Append(
         # which conflicts with C++ built-in bool
         # so it's either -fpermissive or this:
         ("bool", "bool"),
-        # enable LwIPRxBuffer
-        ("LT_HAS_LWIP", "1"),
-        # enable LwIPmDNS
-        ("LT_HAS_LWIP2", "1"),
-        ("LT_PRINTF_BROKEN", "1"),  # printf does not handle %.3f properly
     ],
     LINKFLAGS=[
         "--specs=nosys.specs",
diff --git a/builder/frameworks/realtek-ambz-sdk.py b/builder/frameworks/realtek-ambz-sdk.py
index 7de8817..7a4c347 100644
--- a/builder/frameworks/realtek-ambz-sdk.py
+++ b/builder/frameworks/realtek-ambz-sdk.py
@@ -30,6 +30,13 @@ env.Append(
         "-fsigned-char",
     ],
     CPPDEFINES=[
+        # LibreTuya configuration
+        ("LT_HAS_LWIP", "1"),
+        ("LT_HAS_LWIP2", "1"),
+        ("LT_HAS_FREERTOS", "1"),
+        ("LT_HAS_MBEDTLS", "1"),
+        ("LT_PRINTF_BROKEN", "1"),  # printf does not handle %.3f properly
+        # other options
         "M3",
         "CONFIG_PLATFORM_8711B",
         # LwIP options
diff --git a/builder/utils.py b/builder/utils.py
index 770acfd..b7cd086 100644
--- a/builder/utils.py
+++ b/builder/utils.py
@@ -51,6 +51,7 @@ def env_add_defaults(env, family_name: str, sdk_name: str):
             "$LD_DIR",
         ],
         CPPDEFINES=[
+            ("LIBRETUYA", "1"),
             ("LT_VERSION", platform.version),
             ("LT_BOARD", board.get("build.variant")),
             ("F_CPU", board.get("build.f_cpu")),
diff --git a/docs/config.md b/docs/config.md
index 1a80bcb..5383f06 100644
--- a/docs/config.md
+++ b/docs/config.md
@@ -55,3 +55,5 @@ Families should generally call i.e. WiFiClient debugging for client-related code
 
 - LT_HAS_LWIP - whether family SDK has LwIP. This causes `LwIPRxBuffer.cpp` to be compiled for family libraries to use.
 - LT_HAS_LWIP2 - whether family has LwIP v2.0.0 or newer. This causes `LwIPmDNS.cpp` to be compiled.
+- LT_HAS_FREERTOS - whether family supports FreeRTOS
+- LT_HAS_MBEDTLS - whether family has mbedTLS