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client.js
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client.js
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var Vertx = require("vertx-js/vertx");
var MqttClient = require("vertx-mqtt-js/mqtt_client");
var Buffer = require("vertx-js/buffer");
var MQTT_MESSAGE = "Hello Vert.x MQTT Client";
var BROKER_HOST = "localhost";
var MQTT_TOPIC = "/my_topic";
var BROKER_PORT = 1883;
var options = {
"keepAliveTimeSeconds" : 2
};
var client = MqttClient.create(Vertx.vertx(), options);
// handler will be called when we have a message in topic we subscribing for
client.publishHandler(function (publish) {
console.log("Just received message on [" + publish.topicName() + "] payload [" + publish.payload().toString(Java.type("java.nio.charset.Charset").defaultCharset()) + "] with QoS [" + publish.qosLevel() + "]");
});
// handle response on subscribe request
client.subscribeCompletionHandler(function (h) {
console.log("Receive SUBACK from server with granted QoS : " + h.grantedQoSLevels());
// let's publish a message to the subscribed topic
client.publish(MQTT_TOPIC, Buffer.buffer(MQTT_MESSAGE), 'AT_MOST_ONCE', false, false, function (s, s_err) {
console.log("Publish sent to a server");
});
// unsubscribe from receiving messages for earlier subscribed topic
vertx.setTimer(5000, function (l) {
client.unsubscribe(MQTT_TOPIC);
});
});
// handle response on unsubscribe request
client.unsubscribeCompletionHandler(function (h) {
console.log("Receive UNSUBACK from server");
vertx.setTimer(5000, function (l) {
client.disconnect(function (d, d_err) {
console.log("Disconnected form server");
});
});
});
// connect to a server
client.connect(BROKER_PORT, BROKER_HOST, function (ch, ch_err) {
if (ch_err == null) {
console.log("Connected to a server");
client.subscribe(MQTT_TOPIC, 0);
} else {
console.log("Failed to connect to a server");
console.log(ch_err);
}
});