IBM Watson Speech to Text Websocket closing (with code 1000) without result - node.js

Question

I try to consume basic Speech-To-Text service through websocket using ws package. But after successfully open the connection and send initial message, I never get the listening state.
I also try to send the audio and empty binary (to indicate that uploading process is done), but the server always return close with code 1000.
Following is my code
'use strict';
var fs = require('fs');
var request = require('request');
var WS = require('ws');
var wsURI = 'wss://stream.watsonplatform.net/speech-to-text/api/v1/recognize?watson-token=[TOKEN]&model=en-UK_NarrowbandModell&x-watson-learning-opt-out=1';
var getTokenForm = {
method: 'GET',
uri: 'https://[USER_ID]:[PASSWORD]#stream.watsonplatform.net/authorization/api/v1/token?url=https://stream.watsonplatform.net/speech-to-text/api',
};
var filepath = 'C:/Temp/test1.wav';
request(getTokenForm, function(error, response, body) {
wsURI = wsURI.replace('[TOKEN]', body);
var message = {
'action': 'start',
'content-type': 'audio/wav',
'continuous': true,
'inactivity_timeout': -1
};
var ws = new WS(wsURI);
['message', 'error', 'close', 'open', 'connection'].forEach(function(eventName) {
ws.on(eventName, console.log.bind(console, eventName + ' event: '));
});
ws.on('open', function(evt) {
ws.send(JSON.stringify(message));
setTimeout(function timeout() {
var readStream = fs.createReadStream(filepath);
readStream.on('data', function(data) {
ws.send(data, {
binary: true,
mask: false,
});
});
readStream.on('end', function() {
ws.send(new Buffer(0), {
binary: true,
mask: false,
});
});
}, 1000);
});
ws.on('close', function(data) {
console.log(data)
});
});
Also try to send the file directly (without the stream).
var sound = fs.readFileSync(filepath);
ws.send(sound, { binary: true, mask: false});
And try to add custom header Authorization
var authorization = 'Basic ' + new Buffer('USER_ID:PASSWORD').toString('base64');
var ws = new WS(wsURI, {
headers: {
'Authorization': authorization,
}
});
But no luck so far.

Answer 1

there are a couple of things here. The main issue is that the model in the querystring has a typo - there should be only one 'l' on the end. (Although, not responding with an error message is a bug in the service that I'm going to report to the team.)
So, fix that and you get an error that frames should be masked. That's an easy fix, just switch mask: false to true in both places.
Then, once you've finished sending your audio & ending message, the service will send your final results and then another {"state": "listening"} message. This second state: listening should be your trigger to close the connection. Otherwise it will eventually timeout and close automatically (inactivity_timeout applies when you're sending audio with no speech in it, not when you aren't sending any data at all.)