update BLE library for ESP32 env compatibility

with the last version of ESP32 arduino env it is not possible to compile on ESP32, we get "missing gatt_api.h" ERROR. So as to avoid that we need to use the last version of the nkolban library for BLE 0.4.16

lib/ESP32_BLE_Arduino/src/BLESecurity.cpp

@@ -0,0 +1,105 @@
+/*
+ * BLESecurity.cpp
+ *
+ *  Created on: Dec 17, 2017
+ *      Author: chegewara
+ */
+
+#include <BLESecurity.h>
+#include "sdkconfig.h"
+#if defined(CONFIG_BT_ENABLED)
+
+BLESecurity::BLESecurity() {
+}
+
+BLESecurity::~BLESecurity() {
+}
+/*
+ * @brief Set requested authentication mode
+ */
+void BLESecurity::setAuthenticationMode(esp_ble_auth_req_t auth_req) {
+	m_authReq = auth_req;
+	esp_ble_gap_set_security_param(ESP_BLE_SM_AUTHEN_REQ_MODE, &m_authReq, sizeof(uint8_t));		  // <--- setup requested authentication mode
+}
+
+/**
+ * @brief 	Set our device IO capability to let end user perform authorization
+ * 			either by displaying or entering generated 6-digits pin code
+ */
+void BLESecurity::setCapability(esp_ble_io_cap_t iocap) {
+	m_iocap = iocap;
+	esp_ble_gap_set_security_param(ESP_BLE_SM_IOCAP_MODE, &iocap, sizeof(uint8_t));
+} // setCapability
+
+
+/**
+ * @brief Init encryption key by server
+ * @param key_size is value between 7 and 16
+ */
+void BLESecurity::setInitEncryptionKey(uint8_t init_key) {
+	m_initKey = init_key;
+	esp_ble_gap_set_security_param(ESP_BLE_SM_SET_INIT_KEY, &m_initKey, sizeof(uint8_t));
+} // setInitEncryptionKey
+
+
+/**
+ * @brief Init encryption key by client
+ * @param key_size is value between 7 and 16
+ */
+void BLESecurity::setRespEncryptionKey(uint8_t resp_key) {
+	m_respKey = resp_key;
+	esp_ble_gap_set_security_param(ESP_BLE_SM_SET_RSP_KEY, &m_respKey, sizeof(uint8_t));
+} // setRespEncryptionKey
+
+
+/**
+ *
+ *
+ */
+void BLESecurity::setKeySize(uint8_t key_size) {
+	m_keySize = key_size;
+	esp_ble_gap_set_security_param(ESP_BLE_SM_MAX_KEY_SIZE, &m_keySize, sizeof(uint8_t));
+} //setKeySize
+
+
+/**
+ * @brief Debug function to display what keys are exchanged by peers
+ */
+char* BLESecurity::esp_key_type_to_str(esp_ble_key_type_t key_type)
+{
+	char* key_str = nullptr;
+	switch(key_type) {
+	case ESP_LE_KEY_NONE:
+		key_str = (char*)"ESP_LE_KEY_NONE";
+		break;
+		case ESP_LE_KEY_PENC:
+			key_str = (char*)"ESP_LE_KEY_PENC";
+			break;
+		case ESP_LE_KEY_PID:
+			key_str = (char*)"ESP_LE_KEY_PID";
+			break;
+		case ESP_LE_KEY_PCSRK:
+			key_str = (char*)"ESP_LE_KEY_PCSRK";
+			break;
+		case ESP_LE_KEY_PLK:
+			key_str = (char*)"ESP_LE_KEY_PLK";
+			break;
+		case ESP_LE_KEY_LLK:
+			key_str = (char*)"ESP_LE_KEY_LLK";
+			break;
+    case ESP_LE_KEY_LENC:
+    	key_str = (char*)"ESP_LE_KEY_LENC";
+    	break;
+    case ESP_LE_KEY_LID:
+    	key_str = (char*)"ESP_LE_KEY_LID";
+    	break;
+    case ESP_LE_KEY_LCSRK:
+    	key_str = (char*)"ESP_LE_KEY_LCSRK";
+    	break;
+    default:
+    	key_str = (char*)"INVALID BLE KEY TYPE";
+    	break;
+	}
+	return key_str;
+} // esp_key_type_to_str
+#endif // CONFIG_BT_ENABLED