Websocket

[tomtomgooo 0]

Hi,

I try to use websocket with node-red and emby but I never receive nothing from connection.

I am connected to ws://192.168.1.71:8096?api_key=xxx&deviceId=xxx.

I expect to receive message system from emby passively but it never comes nothing.

Do I need to do something else ?

I am in docker swarm with emby 4.6.4.0.

Thanks for your help

 

[Luke 37132]

HI, what message are you expecting?

[tomtomgooo 0]

I expect to receive change of states like play/pause from any users for example.

[chef 3748]

In the JavaScript API you have to request "Sessions" inorder to get session data through the webSocket. (Play, Pause, stopped)

When I get home from work,  I'll look to see what the actual url is when that request is made.

It is most likely a POST method, with how many milliseconds should pass before getting more data from "Sessions".

 

[tomtomgooo 0]

Ok thanks .

Is it the same url as HTTP rest API?

[chef 3748]

3 hours ago, tomtomgooo said:

Ok thanks .

Is it the same url as HTTP rest API?

Yeah, I think so. You would just use 'ws' instead of 'http'.

 

I meant to check this last night, I will look at it this morning. Apologies.

 

[chef 3748]

Okay here is the Websocket code from the API. Lets see if we can figure out what the websocket message is gonna be for Session data.

sendWebSocketMessage(name, data) {

        console.log(`Sending web socket message: ${name}`);

        let msg = { MessageType: name };

        if (data) {
            msg.Data = data;
        }

        msg = JSON.stringify(msg);

        this._webSocket.send(msg);
    }

    startMessageListener(name, options) {

        this.sendMessage(`${name}Start`, options);

        let list = this.messageListeners;

        if (!list) {
            this.messageListeners = list = [];
        }

        if (!list.includes(name)) {
            list.push(name);
        }
    }

    stopMessageListener(name) {

        this.sendMessage(`${name}Stop`);

        let list = this.messageListeners;

        if (list && list.includes(name)) {
            this.messageListeners = list = list.filter(n => n !== name);
        }
    }

    sendMessage(name, data) {

        if (this.isWebSocketOpen()) {
            this.sendWebSocketMessage(name, data);
        }
    }

 

I might be wrong here, but it's a place to start.

 

First the Websocket URL you have seems to be correct:

ws://{url}:{port}/embywebsocket?api_key={apiKey}&deviceId={deviceName}

 

It then looks like we need to send a POST request along to the URL, with a specific body data.

 

The body data object is JSON, and seems to be an object something like:

{ MessageType: "", Data: ""} 

 

 

It also looks like they append "Start" to the param name here:

 this.sendMessage(`${name}Start`, options);

 

So....Maybe... try sending this in POST body to your websocket URL:

{MessageType: "SessionsStart", Data: "0,5000"}

I believe this says: Open a websocket connection to "Sessions", and get data every 5 seconds.

 

I'm interested in how you fair, so please do let me know.

 

 

 

 

[tomtomgooo 0]

Oh nice it is ok now.

My address was wrong, I forgot /embywebsocket.

I have send :

{MessageType: "SessionsStart", Data: "0,5000"}

All is ok, receive all sessions informations from all user in an array of json.

Thanks for your help