Event subscription never fires iOS

[SergioZhydecky]

this.socket.on(event, (data) => {
      //do actions
 });

event does not fires on iOS, but fires on Android.

This is repository with simple project where it does not work.
Pay attention! To check it out you have to have server side of sockets and change config object with sends to constructor when creates instance of socket service.
https://github.com/SergioZhydecky/test-nativescript-socket.io