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
}
}
void processMessage(String topic, MqttMessage msg) {
L.fine("Received " + msg + " to " + topic);
topic = topic.substring(topicPrefix.length(), topic.length());
if (topic.startsWith("set/")) processSetGet(topic.substring(4), msg, true);
else if (topic.startsWith("get/")) processSetGet(topic.substring(4), msg, false);
else L.warning("Ignored message " + msg + " to unknown topic " + topic);
}
private void doPublish(
String name,
Object val,
String src,
String dpt,
String textual,
long updateTime,
long lastChange) {
JsonObject jso = new JsonObject();
jso.add("ts", updateTime).add("lc", lastChange).add("knx_src_addr", src).add("knx_dpt", dpt);
if (textual != null) jso.add("knx_textual", textual);
if (val instanceof Integer) jso.add("val", ((Integer) val).intValue());
else if (val instanceof Number) jso.add("val", ((Number) val).doubleValue());
else jso.add("val", val.toString());
String txtmsg = jso.toString();
MqttMessage msg = new MqttMessage(jso.toString().getBytes(StandardCharsets.UTF_8));
msg.setQos(0);
msg.setRetained(true);
try {
String fullTopic = topicPrefix + "status/" + name;
mqttc.publish(fullTopic, msg);
L.finer("Published " + txtmsg + " to " + fullTopic);
} catch (MqttException e) {
L.log(Level.WARNING, "Error when publishing message " + txtmsg, e);
}
}
private void processSetGet(String namePart, MqttMessage msg, boolean set) {
if (msg.isRetained()) {
L.finer("Ignoring retained message " + msg + " to " + namePart);
return;
}
// Now translate the topic into a group address
GroupAddressInfo gai = GroupAddressManager.getGAInfoForName(namePart);
if (gai == null) {
L.warning(
"Unable to translate name "
+ namePart
+ " into a group address, ignoring message "
+ msg);
return;
}
L.fine("Name " + namePart + " translates to GA " + gai.address);
String data = new String(msg.getPayload(), StandardCharsets.UTF_8);
if (set) KNXConnector.doGroupWrite(gai.address, data, gai);
else KNXConnector.doGroupRead(gai.address, data, gai);
}
public class MQTTHandler {
private final Logger L = Logger.getLogger(getClass().getName());
public static void init() throws MqttException {
instance = new MQTTHandler();
instance.doInit();
}
private final String topicPrefix;
private MQTTHandler() {
String tp = System.getProperty("knx2mqtt.mqtt.topic", "knx");
if (!tp.endsWith("/")) tp += "/";
topicPrefix = tp;
}
private static MQTTHandler instance;
private MqttClient mqttc;
private void queueConnect() {
shouldBeConnected = false;
Main.t.schedule(
new TimerTask() {
@Override
public void run() {
doConnect();
}
},
10 * 1000);
}
private class StateChecker extends TimerTask {
@Override
public void run() {
if (!mqttc.isConnected() && shouldBeConnected) {
L.warning("Should be connected but aren't, reconnecting");
queueConnect();
}
}
}
private boolean shouldBeConnected;
private static boolean knxConnectionState;
private void processSetGet(String namePart, MqttMessage msg, boolean set) {
if (msg.isRetained()) {
L.finer("Ignoring retained message " + msg + " to " + namePart);
return;
}
// Now translate the topic into a group address
GroupAddressInfo gai = GroupAddressManager.getGAInfoForName(namePart);
if (gai == null) {
L.warning(
"Unable to translate name "
+ namePart
+ " into a group address, ignoring message "
+ msg);
return;
}
L.fine("Name " + namePart + " translates to GA " + gai.address);
String data = new String(msg.getPayload(), StandardCharsets.UTF_8);
if (set) KNXConnector.doGroupWrite(gai.address, data, gai);
else KNXConnector.doGroupRead(gai.address, data, gai);
}
void processMessage(String topic, MqttMessage msg) {
L.fine("Received " + msg + " to " + topic);
topic = topic.substring(topicPrefix.length(), topic.length());
if (topic.startsWith("set/")) processSetGet(topic.substring(4), msg, true);
else if (topic.startsWith("get/")) processSetGet(topic.substring(4), msg, false);
else L.warning("Ignored message " + msg + " to unknown topic " + topic);
}
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
}
}
private void doInit() throws MqttException {
String server = System.getProperty("knx2mqtt.mqtt.server", "tcp://localhost:1883");
String clientID = System.getProperty("knx2mqtt.mqtt.clientid", "knx2mqtt");
mqttc = new MqttClient(server, clientID, new MemoryPersistence());
mqttc.setCallback(
new MqttCallback() {
@Override
public void messageArrived(String topic, MqttMessage msg) throws Exception {
try {
processMessage(topic, msg);
} catch (Exception e) {
L.log(Level.WARNING, "Error when processing message " + msg + " for " + topic, e);
}
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
/* Intentionally ignored */
}
@Override
public void connectionLost(Throwable t) {
L.log(Level.WARNING, "Connection to MQTT broker lost", t);
queueConnect();
}
});
doConnect();
Main.t.schedule(new StateChecker(), 30 * 1000, 30 * 1000);
}
private void doPublish(
String name,
Object val,
String src,
String dpt,
String textual,
long updateTime,
long lastChange) {
JsonObject jso = new JsonObject();
jso.add("ts", updateTime).add("lc", lastChange).add("knx_src_addr", src).add("knx_dpt", dpt);
if (textual != null) jso.add("knx_textual", textual);
if (val instanceof Integer) jso.add("val", ((Integer) val).intValue());
else if (val instanceof Number) jso.add("val", ((Number) val).doubleValue());
else jso.add("val", val.toString());
String txtmsg = jso.toString();
MqttMessage msg = new MqttMessage(jso.toString().getBytes(StandardCharsets.UTF_8));
msg.setQos(0);
msg.setRetained(true);
try {
String fullTopic = topicPrefix + "status/" + name;
mqttc.publish(fullTopic, msg);
L.finer("Published " + txtmsg + " to " + fullTopic);
} catch (MqttException e) {
L.log(Level.WARNING, "Error when publishing message " + txtmsg, e);
}
}
private void sendConnectionState() {
try {
instance.mqttc.publish(
instance.topicPrefix + "connected", (knxConnectionState ? "2" : "1").getBytes(), 1, true);
} catch (MqttException e) {
/* Ignore */
}
}
public static void setKNXConnectionState(boolean connected) {
knxConnectionState = connected;
instance.sendConnectionState();
}
public static void publish(
String name,
Object val,
String src,
String dpt,
String textual,
long updateTime,
long lastChange) {
instance.doPublish(name, val, src, dpt, textual, updateTime, lastChange);
}
}