Hi, I am trying to connect the Prosys SampleServer ,then monitor the data changes and show it in a Surfaceview. codes are in below. But these words “Monitor Data Change successfully” and the current time only appear once. i think the sentence “Monitor Data Change successfully” should always and continuous to be shown. How can I make that happen or can you show me another example? thank you in advance.

new Thread() {
@Override
public void run() {
try {
myClient = createClient(“opc.tcp://uademo.prosysopc.com:52520/OPCUA/SampleConsoleServer”);
myClient.connect();
MonitoredDataItem dataItem = new MonitoredDataItem(Identifiers.Server_ServerStatus_CurrentTime);// is this possible?
Subscription subscription = new Subscription();
subscription.addItem(dataItem);
myClient.addSubscription(subscription);
MonitoredDataItemListener dataChangeListener = new MonitoredDataItemListener() {
@Override
public void onDataChange(MonitoredDataItem sender, DataValue prevValue,
DataValue value) {
System.out.println(“Monitor Data Change successfully”);
if(value!=null){
System.out.println(“————->”+value.getValue().getValue().toString());
}
}
};
dataItem.setDataChangeListener(dataChangeListener);
} catch (Exception e) {
}
}
}.start();