Unable to connect to websocket server on Android QML App

[PaulGrant]

Hi,
I've taken the basic websocket server example from qt5.9, place it in a android project
and tried to connect to it from a linux based websocket client, but it refuses to accept
a connection. I see the error in the node console.
The same app will accept connection if run as a linux desktop app?!?

On Android i'm using APK19.

To test if websockets can work in this way on android I've downloaded an
app from the android store and found I can connect to it fine!

I checked permissions on the app and found the following:
ACCESS_NETWORK_STATE
ACCESS_WIFI_STATE
CHANGE_NETWORK_STATE
CHANGE_WIFI_STATE
INTERNET
I've added these to the android app, but it still refuses to accept connection!

Is there a separate permission required for QT/QML network access?
What would cause this?

Any help would be appreciated!
BR
Paul Grant

[jsulm]

@PaulGrant said in Unable to connect to websocket server on Android QML App:

I see the error in the node console

What is the error?

[PaulGrant]

HI, error is connection refused, which seems to imply permissions issue!

Error: connect ECONNREFUSED 192.168.1.141:8003
at Object.exports._errnoException (util.js:870:11)
at exports._exceptionWithHostPort (util.js:893:20)
at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1063:14)

Additionally if I creat a websocket client in same QML it can communicate
with the server, even when I change the IP of the server from localhost which is
default to actual IP of android device. This again seems to imply a permissions issue!?!

But I dont know of any other relavent Android permissions

BR, Paul

[jsulm]

@PaulGrant I'm not an Android expert, but I can imagine that Android does not allow connections from outside of the device for security reasons.
Why would you want to have a server on your phone?

[mrjj]

Hi
Im no expert either but fooling around with my old one and trying stuff i had to root it to connect to it
https://www.digitaltrends.com/mobile/how-to-make-an-android-server/

[raven-worx]

@PaulGrant
i am also not an android expert :P
But following points come to my mind:

1. are you sure your web-socket server listens on port 8003?
2. do you let your websocket server listen on QHostAddress::Any network address/interface?
3. maybe you can try to launch the server only as soon as a network/WiFi connection is available?

the most important permission is the INTERNET permission, since this lets you open network sockets.

[aneh]

You can use OKHTTP3 WebSocket which is really very easy to configure in android you can try this post: https://trinitytuts.com/connect-to-websocket-on-android-using-okhttp/