Add Added unimplemented getCharacteristicsByHandle function (#3277)

* Add Added unimplemented getCharacteristicsByHandle function

Defined in BLERemoteService.h
But, Not included in BLERemoteService.cpp

* Delete log output

libraries/BLE/src/BLERemoteService.cpp

@@ -226,6 +226,20 @@ std::map<std::string, BLERemoteCharacteristic*>* BLERemoteService::getCharacteri
 	return &m_characteristicMap;
 } // getCharacteristics
 
+/**
+ * @brief Retrieve a map of all the characteristics of this service.
+ * @return A map of all the characteristics of this service.
+ */
+std::map<uint16_t, BLERemoteCharacteristic*>* BLERemoteService::getCharacteristicsByHandle() {
+	// If is possible that we have not read the characteristics associated with the service so do that
+	// now.  The request to retrieve the characteristics by calling "retrieveCharacteristics" is a blocking
+	// call and does not return until all the characteristics are available.
+	if (!m_haveCharacteristics) {
+		retrieveCharacteristics();
+	}
+	return &m_characteristicMapByHandle;
+} // getCharacteristicsByHandle
+
 /**
  * @brief This function is designed to get characteristics map when we have multiple characteristics with the same UUID
  */