private void doConnect() {
L.info(
"Connecting to MQTT broker "
+ mqttc.getServerURI()
+ " with CLIENTID="
+ mqttc.getClientId()
+ " and TOPIC PREFIX="
+ topicPrefix);
MqttConnectOptions copts = new MqttConnectOptions();
copts.setWill(topicPrefix + "connected", "0".getBytes(), 1, true);
copts.setCleanSession(true);
copts.setUserName("emonpi");
copts.setPassword("emonpimqtt2016".toCharArray());
try {
mqttc.connect(copts);
sendConnectionState();
L.info("Successfully connected to broker, subscribing to " + topicPrefix + "(set|get)/#");
try {
mqttc.subscribe(topicPrefix + "set/#", 1);
mqttc.subscribe(topicPrefix + "get/#", 1);
shouldBeConnected = true;
} catch (MqttException mqe) {
L.log(Level.WARNING, "Error subscribing to topic hierarchy, check your configuration", mqe);
throw mqe;
}
} catch (MqttException mqe) {
L.log(
Level.WARNING,
"Error while connecting to MQTT broker, will retry: " + mqe.getMessage(),
mqe);
queueConnect(); // Attempt reconnect
}
}
// 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();
}
}
public void publish(String publishClientId, String publishTopic, byte[] payload)
throws DeviceControllerException {
if (mqttEnabled) {
MqttClient client;
MqttConnectOptions options;
if (publishClientId.length() > 24) {
String errorString =
"No of characters '"
+ publishClientId.length()
+ "' for ClientID: '"
+ publishClientId
+ "' is invalid (should be less than 24, hence please provide a "
+ "simple "
+ "'owner' tag)";
log.error(errorString);
throw new DeviceControllerException(errorString);
} else {
log.info(
"No of Characters "
+ publishClientId.length()
+ " for ClientID : '"
+ publishClientId
+ "' is acceptable");
}
try {
client = new MqttClient(mqttEndpoint, publishClientId);
options = new MqttConnectOptions();
options.setWill("device/clienterrors", "crashed".getBytes(UTF_8), 2, true);
client.setCallback(this);
client.connect(options);
client.publish(publishTopic, payload, 0, true);
if (log.isDebugEnabled()) {
log.debug(
"MQTT Client successfully published to topic: "
+ publishTopic
+ ", with payload - "
+ payload);
}
client.disconnect();
} catch (MqttException ex) {
String errorMsg =
"MQTT Client Error"
+ "\n\tReason: "
+ ex.getReasonCode()
+ "\n\tMessage: "
+ ex.getMessage()
+ "\n\tLocalMsg: "
+ ex.getLocalizedMessage()
+ "\n\tCause: "
+ ex.getCause()
+ "\n\tException: "
+ ex;
log.error(errorMsg, ex);
throw new DeviceControllerException(errorMsg, ex);
}
} else {
log.warn("MQTT <Enabled> set to false in 'device-mgt-config.xml'");
}
}