Connection Time Out after few seconds of connect attempt about cordova-plugin-chrome-apps-sockets-tcp

[KoenLav]

@gdeiorio as I don't have an Android 9 device handy for a reproduction, I'd suggest forking this package and looking at the connect or finishConnect functions in the code where you can see the following:

        } catch (IOException e) {
          callbackContext.error(buildErrorInfo(-104, e.getMessage()));
        }

The -104 indicates something went wrong in the connection process and the message indicates a timeout was the source of the issue.

Does it never work? Or only when the connection takes a lot of time?

This might also help:
https://stackoverflow.com/questions/5632279/how-to-set-timeout-on-client-socket-connection

[gdeiorio]

It turned out it was not an Android 9 related issues, since other devices with that version are not giving trouble.
Actually, the issue happens, most of the times, after a really short time, like 200 or 300ms.
Another strange is behaviour is that the device can connect to the socket via TCP Telnet Terminal, it just can't connect via app.
Am I missing some permissions (but, if so, I don't get why other devices have no problems)?

[KoenLav]

Some links which might be relevant:

https://stackoverflow.com/questions/6586443/android-tcp-permission-denied-error
https://stackoverflow.com/questions/53081049/local-socket-access-denied-in-api23-working-in-api21

In some other blog I read about these two permissions:

[gdeiorio]

Hi,
Looks like the problem is solved.
Apparently it happens when there are both wifi and 4g connection on, some new devices switch automatically to the 4g if the wifi net hasn't access to internet or it has a low quality connection.
Since the device needed to be connected to a specific wifi net, turning off the 4g connection worked.