REST Mesthod "readdatapoint DONE!
usage = http://localhost:8080/eu.smartcampus.api.rest/deviceapi/readdatapoint/<address>
<address> = {library, kernel_14, kernel_16, room_1.17, room_1.19, UTA_A4, amphitheater_A4,  amphitheater_A5, laboratory_1.58"}