[英]Not receiving payloads from mosquitto via websockets
我正在使用VPS,並且正在通過MQTT將數據從Arduino發送到服務器。
Mosquitto通過終端成功打印了有效負載,但是當我嘗試通過網頁實時打印有效負載時,沒有任何反應。
如果我運行,知道我已經在Mosquitto conf中允許使用websockets:
sudo netstat -plnt
我得到:
tcp 0 0 0.0.0.0:1883 0.0.0.0:* LISTEN
13248/mosquitto
tcp 0 0 0.0.0.0:1884 0.0.0.0:* LISTEN
20169/mosquitto
tcp6 0 0 :::1883 :::* LISTEN 13248/mosquitto
我要發送的主題名稱是/ pression,而我正在使用的代碼是:
<script>
var websocket="myserver.ovh.net";
var port= 1884;
var user="username";
var pass="password";
client = new Paho.MQTT.Client(websocket, port, "innovation");
// set callback handlers
client.onConnectionLost = onConnectionLost;
client.onMessageArrived = onMessageArrived;
var options = {
useSSL: false,
userName: user,
password: pass,
onSuccess:onConnect,
onFailure:doFail
}
// connect the client
client.connect(options);
// called when the client connects
function onConnect() {
// Once a connection has been made, make a subscription and send a
message.
document.getElementById("connstatus").innerHTML = "Mqtt Connected";
console.log("Mqtt Connected");
client.subscribe("/pression");
}
function doFail(e){
console.log(e);
}
// called when the client loses its connection
function onConnectionLost(responseObject) {
document.getElementById("connstatus").innerHTML = "Mqtt Not Connected";
if (responseObject.errorCode !== 0) {
console.log("onConnectionLost:"+responseObject.errorMessage);
}
}
function onMessageArrived(message) {
console.log("Pression is :");
document.getElementById("connstatus").innerHTML = message.payloadString;
console.log(message.payloadString);
}
</script>
當我運行腳本時,它說“ Mqtt Connected”,什么也沒發生。
但是,如果我在終端中運行:
mosquitto_sub -t '/pression'
我得到壓力值。
如果我將網頁保持打開狀態幾分鍾,則會收到以下消息:
Mqtt Connected
test.html:76 onConnectionLost:AMQJS0008I Socket closed.
配置文件:
# Place your local configuration in /etc/mosquitto/conf.d/
#
# A full description of the configuration file is at
# /usr/share/doc/mosquitto/examples/mosquitto.conf.example
pid_file /var/run/mosquitto.pid
persistence true
persistence_location /var/lib/mosquitto/
log_dest file /var/log/mosquitto/mosquitto.log
include_dir /etc/mosquitto/conf.d
#password_file /etc/mosquitto/passwd
#allow_anonymous false
listener 1884
protocol websockets
蚊子日志:
1557922249: Config loaded from /etc/mosquitto/mosquitto.conf.
1557922249: Opening websockets listen socket on port 1884.
1557922254: New client connected from xx.xx.11.163 as innovation (c1, k60, u'innovation').
1557922279: Socket error on client innovation, disconnecting.
1557922279: New client connected from xx.xx.11.163 as innovation (c1, k60, u'innovation').
1557922318: Socket error on client innovation, disconnecting.
1557922318: New client connected from xx.xx.11.163 as innovation (c1, k60, u'innovation').
1557922346: Socket error on client innovation, disconnecting.
1557922346: New client connected from xx.xx.11.163 as innovation (c1, k60, u'innovation').
1557922363: Socket error on client innovation, disconnecting.
1557922364: New client connected from xx.xx.11.163 as innovation (c1, k60, u'innovation').
1557922463: Socket error on client innovation, disconnecting.
好的,這里的問題很可能是您在HTML中使用了固定的客戶端ID( innovation
)。
您只能將1個客戶端與給定的客戶端ID連接在一起,因此,當一個具有相同ID的新客戶端連接時(例如,重新加載頁面時),代理將斷開最舊的客戶端的連接。
嘗試將連接線更改為如下所示:
var clientID = "innovation_" + new Date().getTime();
client = new Paho.MQTT.Client(websocket, port, clientID);
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