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모든 주제에서 MQTT 메시지를 받기 위해 paho 웹 소켓 자바 스크립트를 사용하고 있습니다. 런타임에 구독하는 메시지에서 메시지를 가져올 수 있지만 선택 상자를 사용하여 동적으로 항목을 변경하고 선택한 항목에서만 메시지를 수신해야합니다.paho websocked에서 가입 한 주제를 동적으로 변경할 수 있습니까?
나는 여러 가지 해결책을 시도해 왔지만 완전히 성공했지만 아무런 성공도 찾지 못했습니다.
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Mosquitto Websockets</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta charset="utf-8">
<script src="mqttws31.js" type="text/javascript"></script>
<script src="jquery.min.js" type="text/javascript"></script>
<script src="config.js" type="text/javascript"></script>
<script type="text/javascript">
var mqtt;
var reconnectTimeout = 2000;
var selectedtopic='#';
function MQTTconnect(selectedtopic) {
if (typeof path == "undefined") {
path = '/mqtt';
}
mqtt = new Paho.MQTT.Client(
host,
port,
path,
"web_" + parseInt(Math.random() * 100, 10)
);
var options = {
timeout: 3,
useSSL: useTLS,
cleanSession: cleansession,
onSuccess: onConnect,
onFailure: function (message) {
$('#status').val("Connection failed: " + message.errorMessage + "Retrying");
setTimeout(MQTTconnect, reconnectTimeout);
}
};
mqtt.onConnectionLost = onConnectionLost;
mqtt.onMessageArrived = onMessageArrived;
if (username != null) {
options.userName = username;
options.password = password;
}
console.log("Host="+ host + ", port=" + port + ", path=" + path + " TLS = " + useTLS + " username=" + username + " password=" + password);
mqtt.connect(options);
}
function onConnect() {
$('#status').val('Connected to ' + host + ':' + port + path);
// Connection succeeded; subscribe to our topic
console.log("subscribed to "+selectedtopic);
mqtt.subscribe(selectedtopic, {qos: 0});
$('#topic').val(selectedtopic);
}
function onConnectionLost(response) {
setTimeout(MQTTconnect, reconnectTimeout);
$('#status').val("connection lost: " + responseObject.errorMessage + ". Reconnecting");
};
function onMessageArrived(message) {
var topic = message.destinationName;
var payload = message.payloadString;
$('#ws').prepend('<li>' + topic + ' = ' + payload + '</li>');
};
$(document).ready(function() {
MQTTconnect(selectedtopic);
$('#topic').change(function()
{
selectedtopic = $(this).val();
console.log("change "+selectedtopic);
})
});
</script>
</head>
<body>
<h1>Things</h1>
<div>
<div>Location
<select id="topic">
<option value="#">All</option>
<option value="emergency-room/#">Emergency room</option>
<option value="ward/#">Ward</option>
</select>
Status: <input type='text' id='status' size="80" disabled /></div>
<ul id='ws' style="font-family: 'Courier New', Courier, monospace;"></ul>
</div>
</body>
</html>