code: public String getEntitySensorsValue(String brooklynId, String brooklynEntityId, String sensorId) throws IOException {
          Invocation invocation = getJerseyClient().target(
                  getEndpoint() + "/v1/applications/" + brooklynId + "/entities/" + brooklynEntityId + "/sensors/" + sensorId + "?raw=true")
                  .request().buildGet();
  
          return invocation.invoke().readEntity(String.class);
      }
docs: Creates a proxied HTTP GET request to Apache Brooklyn to retrieve Sensors from a particular Entity
  
  @param brooklynId of the desired application to fetch. This ID may differ from SeaClouds Application ID
  @param brooklynEntityId of the desired entity. This Entity ID should be children of brooklynId
  @param sensorId of the desired sensor. This Sensor ID should be children of brooklynEntityid
  @return String representing the sensor value