// region MqttActionCallBack -- connection success or fail
@Override
public void onSuccess(IMqttToken iMqttToken) {
isConnected = true;
ShowToast("连接成功");
try {
client.subscribe("Likaci/MqttMap", 0);
} catch (MqttException e) {
e.printStackTrace();
}
}
@Override
protected void init(VaadinRequest request) {
System.out.println("request = " + request);
final VerticalLayout layout = new VerticalLayout();
layout.setMargin(true);
setContent(layout);
layout.addComponent(chart);
try {
empf = new MqttClient("tcp://192.168.0.106:1883", "MyfirstMQTTEmpf", new MemoryPersistence());
empf.setCallback(
new MqttCallback() {
@Override
public void connectionLost(Throwable throwable) {}
@Override
public void messageArrived(String str, MqttMessage mqttMessage) throws Exception {
byte[] payload = mqttMessage.getPayload();
lastMessage = new String(payload);
System.out.println("s = " + str + " msg " + lastMessage);
}
@Override
public void deliveryComplete(IMqttDeliveryToken iMqttDeliveryToken) {}
});
Button button = new Button("refresh");
button.addClickListener(
event ->
access(
() ->
chart
.getConfiguration()
.getSeries()
.forEach(
s ->
((ListSeries) s)
.updatePoint(0, Double.valueOf(lastMessage.split(":")[3])))));
layout.addComponent(button);
empf.connect();
empf.subscribe(TOPIC, 1);
mqqtThread.start();
} catch (MqttException e) {
e.printStackTrace();
}
}