import { Network } from '@awesome-cordova-plugins/network/ngx';
constructor(private network: Network) { }
...
let disconnectSubscription = this.network.onDisconnect().subscribe(() => {
  console.log('network was disconnected :-(');
});
disconnectSubscription.unsubscribe();
let connectSubscription = this.network.onConnect().subscribe(() => {
  console.log('network connected!');
  
   
  
  setTimeout(() => {
    if (this.network.type === 'wifi') {
      console.log('we got a wifi connection, woohoo!');
    }
  }, 3000);
});
connectSubscription.unsubscribe();