[英]Can't apply wildcard when subscribe to a topic with the javascript version of paho mqtt
首次测试MQTT Paho javascript库,并且以下代码是文档中提供的默认示例。 一旦我尝试使用通配符“#”订阅主题(例如'hermes /#'),就会出现此错误:
onConnectionLost:AMQJS0005E内部错误。 错误消息:AMQJS0009E格式错误的UTF数据:80 -42。,堆栈跟踪:错误:AMQJS0009E格式错误的UTF数据:80 -42。
该文档确实非常简洁,无论如何也没有提及通配符,是js库缺少功能还是有其他方法?
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<script src="paho-mqtt.js" type="text/javascript"></script>
<script type="text/javascript">
var mqtt;
var reconnectTimeout = 2000;
var host="mywairaspi.local"; //change this
var port= 8080;
// Create a client instance
client = new Paho.MQTT.Client(host,port,'60');
// set callback handlers
client.onConnectionLost = onConnectionLost;
client.onMessageArrived = onMessageArrived;
// connect the client
client.connect({onSuccess:onConnect});
// called when the client connects
function onConnect() {
// Once a connection has been made, make a subscription and send a message.
console.log("onConnect");
client.subscribe("/World");
client.subscribe('hermes/#');
message = new Paho.MQTT.Message("Hello");
message.destinationName = "/World";
client.send(message);
}
// called when the client loses its connection
function onConnectionLost(responseObject) {
if (responseObject.errorCode !== 0) {
console.log("onConnectionLost:"+responseObject.errorMessage);
}
}
// called when a message arrives
function onMessageArrived(message) {
console.log("onMessageArrived:"+message.payloadString);
}
</script>
</head>
<body>
</body>
</html>
我相信您会在PAHO客户端中看到一个错误,因为肯定支持通配符。 截至2018年11月,如果接收到的任何消息都是原始二进制数据(或根本没有解析为有效的UTF),那么它将给出``格式错误的UTF数据''错误。
已在github上添加了pull-request,已为我修复了该请求,并希望它将很快合并到一个发行版中: https : //github.com/eclipse/paho.mqtt.javascript/pull/178
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