Add new component for Tuya dimmers (#743)

* Add new component for Tuya dimmers

* Update code

* Class naming

* Log output

* Fixes

* Lint

* Format

* Fix test

* log setting datapoint values

* remove in_setup_ and fix datapoint handling


Co-authored-by: Samuel Sieb <samuel@sieb.net>
Co-authored-by: Otto Winter <otto@otto-winter.com>

esphome/components/tuya/tuya.h

@@ -0,0 +1,73 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/uart/uart.h"
+
+namespace esphome {
+namespace tuya {
+
+enum class TuyaDatapointType : uint8_t {
+  RAW = 0x00,      // variable length
+  BOOLEAN = 0x01,  // 1 byte (0/1)
+  INTEGER = 0x02,  // 4 byte
+  STRING = 0x03,   // variable length
+  ENUM = 0x04,     // 1 byte
+  BITMASK = 0x05,  // 2 bytes
+};
+
+struct TuyaDatapoint {
+  uint8_t id;
+  TuyaDatapointType type;
+  union {
+    bool value_bool;
+    int value_int;
+    uint32_t value_uint;
+    uint8_t value_enum;
+    uint16_t value_bitmask;
+  };
+};
+
+struct TuyaDatapointListener {
+  uint8_t datapoint_id;
+  std::function<void(TuyaDatapoint)> on_datapoint;
+};
+
+enum class TuyaCommandType : uint8_t {
+  HEARTBEAT = 0x00,
+  QUERY_PRODUCT = 0x01,
+  MCU_CONF = 0x02,
+  WIFI_STATE = 0x03,
+  WIFI_RESET = 0x04,
+  WIFI_SELECT = 0x05,
+  SET_DATAPOINT = 0x06,
+  STATE = 0x07,
+  QUERY_STATE = 0x08,
+};
+
+class Tuya : public Component, public uart::UARTDevice {
+ public:
+  float get_setup_priority() const override { return setup_priority::HARDWARE; }
+  void setup() override;
+  void loop() override;
+  void dump_config() override;
+  void register_listener(uint8_t datapoint_id, const std::function<void(TuyaDatapoint)> &func);
+  void set_datapoint_value(TuyaDatapoint datapoint);
+
+ protected:
+  void handle_char_(uint8_t c);
+  void handle_datapoint_(const uint8_t *buffer, size_t len);
+  bool validate_message_();
+
+  void handle_command_(uint8_t command, uint8_t version, const uint8_t *buffer, size_t len);
+  void send_command_(TuyaCommandType command, const uint8_t *buffer, uint16_t len);
+  void send_empty_command_(TuyaCommandType command) { this->send_command_(command, nullptr, 0); }
+
+  int gpio_status_ = -1;
+  int gpio_reset_ = -1;
+  std::vector<TuyaDatapointListener> listeners_;
+  std::vector<TuyaDatapoint> datapoints_;
+  std::vector<uint8_t> rx_message_;
+};
+
+}  // namespace tuya
+}  // namespace esphome