client.setURI(uri + "/obs-non").useNONs();
System.out.println("===============\nCO02+06");
System.out.println("---------------\nNON-GET /obs-non with Observe");
CoapObserveRelation relation2 = client.observe(
new CoapHandler() {
@Override public void onLoad(CoapResponse response) {
String content = response.getResponseText();
System.out.println("-CO02----------");
System.out.println(content);