Erro with Engine API - Qlik Sense Desktop

[JoanPedro2]

I need to make a interval refresh on my data table. But, the method doReload not works. On Engine API Explorer i receive invalid Status for doReload call in Doc. 

And, in Javascript i receive the comming Object: 

{
jsonrpc: '2.0',
id: 0,
error: {
code: -32602,
parameter: 'Invalid handle',
message: 'Invalid Params'
}
}

I able to call DOC and receive:

{
jsonrpc: '2.0',
method: 'OnConnected',
params: { qSessionState: 'SESSION_ATTACHED' }
}

{
jsonrpc: '2.0',
id: 2,
result: {
qReturn: {
qType: 'Doc',
qHandle: 1,
qGenericId: 'C:\\Users\\LDXNT25\\Documents\\Qlik\\Sense\\Apps\\DBTesting.qvf'
}
}

My Javascript code is:

const WebSocket = require('ws')

module.exports = app => {

    function Repeating() {
        var ws = new WebSocket("ws://localhost:4848/app/C%3A%5CUsers%5CLDXNT25%5CDocuments%5CQlik%5CSense%5CApps%5CDBTesting.qvf")

        var openingDoc = {
            "jsonrpc": "2.0",
            "id": 2,
            "method": "OpenDoc",
            "handle": -1,
            "params": [
                "C:\\Users\\LDXNT25\\Documents\\Qlik\\Sense\\Apps\\DBTesting.qvf"
            ]
        }

        var doReloading = {
            "handle": 1,
            "method": "DoReload",
            "params": {
                "qMode": 0,
                "qPartial": false,
                "qDebug": false
            }
        }

        ws.onopen = function(e) {
            console.log("Sending to server");
            ws.send(JSON.stringify(openingDoc))
            ws.send(JSON.stringify(doReloading))

        }

        ws.onmessage = function(event) {
            console.log(JSON.parse(event.data))
        }
    }

    setInterval(() => {
        Repeating()
    }, 25000);

}

The question: What the erro? Im on Limited Account (30days)

[Øystein_Kolsrud]

In your "onopen" event handler it seems you are sending two messages on the websocket in quick succession: one to open the app and one to reload it. You probably have to wait for the open to finish before you can call the reload method.

[pramos94]

  ws.onopen = function(e) {
    console.log("Sending to server");
    ws.send(JSON.stringify(openingDoc))
    setTimeout(()=>{
      ws.send(JSON.stringify(doReloading))
    },1000)
  }

With this I think you can solve the error.