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lib/ESP32_BLE_Arduino/src/BLEDescriptor.h

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+/*
+ * BLEDescriptor.h
+ *
+ *  Created on: Jun 22, 2017
+ *      Author: kolban
+ */
+
+#ifndef COMPONENTS_CPP_UTILS_BLEDESCRIPTOR_H_
+#define COMPONENTS_CPP_UTILS_BLEDESCRIPTOR_H_
+#include "sdkconfig.h"
+#if defined(CONFIG_BT_ENABLED)
+#include <string>
+#include "BLEUUID.h"
+#include "BLECharacteristic.h"
+#include <esp_gatts_api.h>
+#include "FreeRTOS.h"
+
+class BLEService;
+class BLECharacteristic;
+class BLEDescriptorCallbacks;
+
+/**
+ * @brief A model of a %BLE descriptor.
+ */
+class BLEDescriptor {
+public:
+	BLEDescriptor(const char* uuid);
+	BLEDescriptor(BLEUUID uuid);
+	virtual ~BLEDescriptor();
+
+	uint16_t getHandle();
+	size_t   getLength();
+	BLEUUID  getUUID();
+	uint8_t* getValue();
+	void handleGATTServerEvent(
+			esp_gatts_cb_event_t      event,
+			esp_gatt_if_t             gatts_if,
+			esp_ble_gatts_cb_param_t* param);
+	void setCallbacks(BLEDescriptorCallbacks* pCallbacks);
+	void setValue(uint8_t* data, size_t size);
+	void setValue(std::string value);
+	std::string toString();
+
+private:
+	friend class BLEDescriptorMap;
+	friend class BLECharacteristic;
+	BLEUUID              m_bleUUID;
+	esp_attr_value_t     m_value;
+	uint16_t             m_handle;
+	BLECharacteristic*   m_pCharacteristic;
+	BLEDescriptorCallbacks* m_pCallback;
+	void executeCreate(BLECharacteristic* pCharacteristic);
+	void setHandle(uint16_t handle);
+	FreeRTOS::Semaphore m_semaphoreCreateEvt = FreeRTOS::Semaphore("CreateEvt");
+};
+
+/**
+ * @brief Callbacks that can be associated with a %BLE descriptors to inform of events.
+ *
+ * When a server application creates a %BLE descriptor, we may wish to be informed when there is either
+ * a read or write request to the descriptors value.  An application can register a
+ * sub-classed instance of this class and will be notified when such an event happens.
+ */
+class BLEDescriptorCallbacks {
+public:
+	virtual ~BLEDescriptorCallbacks();
+	virtual void onRead(BLEDescriptor* pDescriptor);
+	virtual void onWrite(BLEDescriptor* pDescriptor);
+};
+#endif /* CONFIG_BT_ENABLED */
+#endif /* COMPONENTS_CPP_UTILS_BLEDESCRIPTOR_H_ */