add of Xiaomi Mijia BT4.0 clock temperature and humidity sensor (LYWSD02)

and enable multiple services data readings for Mijia standard device. Indeed the new version seems to publish several service data compared to old ones.
Please note that I'have update the library with the work of @fguiet
see: https://github.com/nkolban/ESP32_BLE_Arduino/pull/24

lib/ESP32_BLE_Arduino/src/BLEAdvertisedDevice.cpp

@@ -29,7 +29,6 @@ BLEAdvertisedDevice::BLEAdvertisedDevice() {
 	m_manufacturerData = "";
 	m_name             = "";
 	m_rssi             = -9999;
-	m_serviceData      = "";
 	m_txPower          = 0;
 	m_pScan            = nullptr;
 
@@ -106,12 +105,24 @@ BLEScan* BLEAdvertisedDevice::getScan() {
 } // getScan
 
 
+/**
+ * @brief Get the number of service data.
+ * @return Number of service data discovered.
+ */
+int BLEAdvertisedDevice::getServiceDataCount() {
+	if (m_haveServiceData)
+		return m_serviceDataVector.size();
+	else
+		return 0;
+	
+} //getServiceDataCount
+
 /**
  * @brief Get the service data.
  * @return The ServiceData of the advertised device.
  */
-std::string BLEAdvertisedDevice::getServiceData() {
-	return m_serviceData;
+std::string BLEAdvertisedDevice::getServiceData(int i) {
+	return m_serviceDataVector[i];
 } //getServiceData
 
 
@@ -119,8 +130,8 @@ std::string BLEAdvertisedDevice::getServiceData() {
  * @brief Get the service data UUID.
  * @return The service data UUID.
  */
-BLEUUID BLEAdvertisedDevice::getServiceDataUUID() {
-	return m_serviceDataUUID;
+BLEUUID BLEAdvertisedDevice::getServiceDataUUID(int i) {
+	return m_serviceDataUUIDs[i];
 } // getServiceDataUUID
 
 
@@ -128,8 +139,8 @@ BLEUUID BLEAdvertisedDevice::getServiceDataUUID() {
  * @brief Get the Service UUID.
  * @return The Service UUID of the advertised device.
  */
-BLEUUID BLEAdvertisedDevice::getServiceUUID() {  //TODO Remove it eventually, is no longer useful
-	return m_serviceUUIDs[0];
+BLEUUID BLEAdvertisedDevice::getServiceUUID(int i) {  
+	return m_serviceUUIDs[i];
 } // getServiceUUID
 
 /**
@@ -458,7 +469,7 @@ void BLEAdvertisedDevice::setServiceUUID(BLEUUID serviceUUID) {
  */
 void BLEAdvertisedDevice::setServiceData(std::string serviceData) {
 	m_haveServiceData = true;         // Set the flag that indicates we have service data.
-	m_serviceData     = serviceData;  // Save the service data that we received.
+	m_serviceDataVector.push_back(serviceData); // Save the service data that we received.
 } //setServiceData
 
 
@@ -468,7 +479,8 @@ void BLEAdvertisedDevice::setServiceData(std::string serviceData) {
  */
 void BLEAdvertisedDevice::setServiceDataUUID(BLEUUID uuid) {
 	m_haveServiceData = true;         // Set the flag that indicates we have service data.
-	m_serviceDataUUID = uuid;
+	m_serviceDataUUIDs.push_back(uuid);
+	ESP_LOGD(LOG_TAG, "- addServiceDataUUID(): serviceDataUUID: %s", uuid.toString().c_str());
 } // setServiceDataUUID
 
 
@@ -499,7 +511,9 @@ std::string BLEAdvertisedDevice::toString() {
 		free(pHex);
 	}
 	if (haveServiceUUID()) {
-		ss << ", serviceUUID: " << getServiceUUID().toString();
+		for (int i; i < m_serviceUUIDs.size(); i++) {
+			ss << ", serviceUUID: " << getServiceUUID(i).toString();
+		}
 	}
 	if (haveTXPower()) {
 		ss << ", txPower: " << (int)getTXPower();