Add Xiaomi Cleargrass Temperature and Humidity Sensor (#735)

* Add Xiaomi Cleargrass Temperature and Humidity Sensor

* fix CI Travis

* fix CI Travis 2

* Improve device detection (more accurate)


Co-authored-by: t151602 <sergio.mayoralmartinez@telefonica.com>

esphome/components/xiaomi_cleargrass/xiaomi_cleargrass.h

@@ -0,0 +1,50 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/sensor/sensor.h"
+#include "esphome/components/esp32_ble_tracker/esp32_ble_tracker.h"
+#include "esphome/components/xiaomi_ble/xiaomi_ble.h"
+
+#ifdef ARDUINO_ARCH_ESP32
+
+namespace esphome {
+namespace xiaomi_cleargrass {
+
+class XiaomiCleargrass : public Component, public esp32_ble_tracker::ESPBTDeviceListener {
+ public:
+  void set_address(uint64_t address) { address_ = address; }
+
+  bool parse_device(const esp32_ble_tracker::ESPBTDevice &device) override {
+    if (device.address_uint64() != this->address_)
+      return false;
+
+    auto res = xiaomi_ble::parse_xiaomi(device);
+    if (!res.has_value())
+      return false;
+
+    if (res->temperature.has_value() && this->temperature_ != nullptr)
+      this->temperature_->publish_state(*res->temperature);
+    if (res->humidity.has_value() && this->humidity_ != nullptr)
+      this->humidity_->publish_state(*res->humidity);
+    if (res->battery_level.has_value() && this->battery_level_ != nullptr)
+      this->battery_level_->publish_state(*res->battery_level);
+    return true;
+  }
+
+  void dump_config() override;
+  float get_setup_priority() const override { return setup_priority::DATA; }
+  void set_temperature(sensor::Sensor *temperature) { temperature_ = temperature; }
+  void set_humidity(sensor::Sensor *humidity) { humidity_ = humidity; }
+  void set_battery_level(sensor::Sensor *battery_level) { battery_level_ = battery_level; }
+
+ protected:
+  uint64_t address_;
+  sensor::Sensor *temperature_{nullptr};
+  sensor::Sensor *humidity_{nullptr};
+  sensor::Sensor *battery_level_{nullptr};
+};
+
+}  // namespace xiaomi_cleargrass
+}  // namespace esphome
+
+#endif