websocket上的以下错误是什么意思以及如何解决

Question

I am trying to connect my ALEXA skill kit through lambda function to ROS (running on my ubutnu VM machine) via web sockets. The problem is web sockets connection is not being established. I get the following error message:

Error connecting to websocket server: { Error: connect ETIMEDOUT 192.168.0.20:9090
at Object.exports._errnoException (util.js:1018:11)
at exports._exceptionWithHostPort (util.js:1041:20)
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1086:14)
code: 'ETIMEDOUT',
errno: 'ETIMEDOUT',
syscall: 'connect',
address: '192.168.0.20',
port: 9090,
type: 'error',
target: 
WebSocket {
domain: null,
_events: 
{ open: [Object],
close: [Object],
error: [Object],
message: [Object] },
_eventsCount: 4,
_maxListeners: undefined,
_socket: null,
_ultron: null,
_closeReceived: false,
bytesReceived: 0,
readyState: 0,
supports: { binary: true },
extensions: {},
_isServer: false,
url: 'ws://192.168.0.20:9090',
protocolVersion: 13 } }

Answer 1

• WebSocket URL '192.168.0.20' is a local address. if you are using AWS Lambda, then your lambda function can not connect to '192.168.0.20'. Because they are not on the same network

• If your Alexa kit and WebSocket on the same network, Because of VM they will not on the exact same network. VM creates its own network

Answer 2

@hasbi has the right answer to why you are getting this error.

As a work around, consider using a tunneling service such as ngrok (free).