score:1
Accepted answer
you can use observable or subject to listen data stream in realtime. your your socket service probably will be like below.
export class mqttservice {
private mqttclient:any;//any mqtt implementation library
connect(params:any): {
this.mqttclient = mqtt.connect('connection url');
}
ontopic(topic: string,header:any): observable<any> {
//subscribe any topic here.
return observable.create((observer) => {
this.mqttclient.observe(topic).subscribe((message) => {
observer.next(json.parse(message.payload.tostring()));
},header);
});
}
}
after you wrote your service, use it inside any component you wish.
export class tab1page {
@viewchild("barcanvas", { static: true }) barcanvas: elementref;
private barchart: chart;
constructor(private mqttservice:mqttservice){}
ngoninit() {
this.barchart = new chart(this.barcanvas.nativeelement)//no idea how to init this class,
this.mqttservice.ontopic("app/chart").subscribe(data=>{
this.refreshchart(this.barchart,data)
})
}
refreshchart(chart:chart,data){
//refresh the chart
}
}
Source: stackoverflow.com
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