diff --git a/arduino/libretuya/core/ChipType.h b/arduino/libretuya/core/ChipType.h
new file mode 100644
index 0000000..849685e
--- /dev/null
+++ b/arduino/libretuya/core/ChipType.h
@@ -0,0 +1,23 @@
+/* Copyright (c) Kuba Szczodrzyński 2022-05-28. */
+
+enum ChipFamily {
+	// copied from UF2 families (first nibble)
+	RTL8710A = 0x9F, // Realtek Ameba1
+	RTL8710B = 0x22, // Realtek AmebaZ (realtek-ambz)
+	RTL8720C = 0xE0, // Realtek AmebaZ2
+	RTL8720D = 0x33, // Realtek AmebaD
+	BK7231T	 = 0x67, // Beken 7231T
+	BK7231N	 = 0x7B, // Beken 7231N
+	BL602	 = 0xDE, // Boufallo 602
+	XR809	 = 0x51, // Xradiotech 809
+};
+
+enum ChipType {
+	// copied from rtl8710b_efuse.h
+	RTL8710BL = (RTL8710B << 8) | 0xE0, // ???
+	RTL8710BN = (RTL8710B << 8) | 0xFF, // CHIPID_8710BN / QFN32
+	RTL8710BU = (RTL8710B << 8) | 0xFE, // CHIPID_8710BU / QFN48
+	RTL8710BX = (RTL8710B << 8) | 0xFB, // CHIPID_8710BN_L0 / QFN32
+	RTL8711BN = (RTL8710B << 8) | 0xFD, // CHIPID_8711BN / QFN48
+	RTL8711BU = (RTL8710B << 8) | 0xFC, // CHIPID_8711BG / QFN68
+};
diff --git a/arduino/libretuya/core/LibreTuyaAPI.cpp b/arduino/libretuya/core/LibreTuyaAPI.cpp
index cf8ba1c..1a0657c 100644
--- a/arduino/libretuya/core/LibreTuyaAPI.cpp
+++ b/arduino/libretuya/core/LibreTuyaAPI.cpp
@@ -59,3 +59,37 @@ void hexdump(uint8_t *buf, size_t len, uint32_t offset, uint8_t width) {
 		pos += lineWidth;
 	}
 }
+
+/**
+ * @brief Get LibreTuya version string.
+ */
+const char *LibreTuya::getVersion() {
+	return LT_VERSION_STR;
+}
+
+/**
+ * @brief Get board name.
+ */
+const char *LibreTuya::getBoard() {
+	return LT_BOARD_STR;
+}
+
+static char *deviceName = NULL;
+
+/**
+ * @brief Get device friendly name in format "LT-<board>-<chip id>".
+ * Can be used as hostname.
+ */
+const char *LibreTuya::getDeviceName() {
+	if (deviceName)
+		return deviceName;
+	uint32_t chipId = getChipId();
+	uint8_t *id		= (uint8_t *)&chipId;
+
+	const char *board = getBoard();
+	uint8_t boardLen  = strlen(board);
+	deviceName		  = (char *)malloc(3 + boardLen + 1 + 6 + 1);
+
+	sprintf(deviceName, "LT-%s-%02x%02x%02x", board, id[0], id[1], id[2]);
+	return deviceName;
+}
diff --git a/arduino/libretuya/core/LibreTuyaAPI.h b/arduino/libretuya/core/LibreTuyaAPI.h
index 0a20b04..75c6fb8 100644
--- a/arduino/libretuya/core/LibreTuyaAPI.h
+++ b/arduino/libretuya/core/LibreTuyaAPI.h
@@ -54,6 +54,10 @@ void hexdump(uint8_t *buf, size_t len, uint32_t offset, uint8_t width);
 
 // Main class
 #ifdef __cplusplus
+
+#include <Flash.h> // for flash inline methods
+#include <core/ChipType.h>
+
 /**
  * @brief Main LibreTuya API class.
  *
@@ -63,14 +67,100 @@ void hexdump(uint8_t *buf, size_t len, uint32_t offset, uint8_t width);
  * The class is accessible using the `LT` global object (defined by the platform).
  */
 class LibreTuya {
+  public: /* Common methods - note: these are documented in LibreTuyaAPI.cpp */
+	const char *getVersion();
+	const char *getBoard();
+	const char *getDeviceName();
 
-	/* Common methods*/
+  public: /* Inline methods */
+	inline uint32_t getFlashChipSize() {
+		return Flash.getSize();
+	}
 
-  public:
-	/* Platform-defined methods */
+	// inline bool flashEraseSector(uint32_t sector) {}
+	// inline bool flashWrite(uint32_t offset, uint32_t *data, size_t size) {}
+	// inline bool flashRead(uint32_t offset, uint32_t *data, size_t size) {}
+	// inline bool partitionEraseRange(const esp_partition_t *partition, uint32_t offset, size_t size) {}
+	// inline bool partitionWrite(const esp_partition_t *partition, uint32_t offset, uint32_t *data, size_t size) {}
+	// inline bool partitionRead(const esp_partition_t *partition, uint32_t offset, uint32_t *data, size_t size) {}
 
-  public:
+  public: /* Platform-defined methods */
+	/**
+	 * @brief Reboot the CPU.
+	 */
+	void restart();
+
+  public: /* CPU-related */
+	/**
+	 * @brief Get CPU model ID.
+	 */
+	ChipType getChipType();
+	/**
+	 * @brief Get CPU model name as string.
+	 */
+	const char *getChipModel();
+	/**
+	 * @brief Get CPU unique ID. This may be based on MAC, eFuse, etc.
+	 */
+	uint32_t getChipId();
+	/**
+	 * @brief Get CPU core count.
+	 */
+	uint8_t getChipCores();
+	/**
+	 * @brief Get CPU core type name as string.
+	 */
+	const char *getChipCoreType();
+	/**
+	 * @brief Get CPU frequency in MHz.
+	 */
+	uint32_t getCpuFreqMHz();
+	/**
+	 * @brief Get CPU cycle count.
+	 */
+	inline uint32_t getCycleCount() __attribute__((always_inline));
+
+  public: /* Memory management */
+	/**
+	 * @brief Get total RAM size.
+	 */
+	uint32_t getRamSize();
+	/**
+	 * @brief Get total heap size.
+	 */
+	uint32_t getHeapSize();
+	/**
+	 * @brief Get free heap size.
+	 */
+	uint32_t getFreeHeap();
+	/**
+	 * @brief Get lowest level of free heap memory.
+	 */
+	uint32_t getMinFreeHeap();
+	/**
+	 * @brief Get largest block of heap that can be allocated at once.
+	 */
+	uint32_t getMaxAllocHeap();
+
+  public: /* OTA-related */
+	/**
+	 * @brief Get the currently running firmware OTA index.
+	 */
+	uint8_t getOtaRunning();
+	/**
+	 * @brief Get the OTA index for updated firmware.
+	 *
+	 * Note: should return 1 for chips without dual-OTA.
+	 */
+	uint8_t getOtaTarget();
+	/**
+	 * @brief Try to switch OTA index to the other image.
+	 *
+	 * @return false if writing failed or dual-OTA not supported; true otherwise
+	 */
+	bool switchOta();
 };
 
 extern LibreTuya LT;
+extern LibreTuya ESP;
 #endif
diff --git a/builder/utils.py b/builder/utils.py
index 68e81e3..311cc8f 100644
--- a/builder/utils.py
+++ b/builder/utils.py
@@ -49,6 +49,8 @@ def env_add_defaults(env, platform_name: str, sdk_name: str):
         CPPDEFINES=[
             ("LT_VERSION", platform.version),
             ("LT_BOARD", board.get("build.variant")),
+            ("F_CPU", board.get("build.f_cpu")),
+            ("MCU", board.get("build.mcu").upper()),
         ],
     )