Ionic Native: ZeroConf not working on IOS

Question

So I made the App with a Android Device in the development Process and everything worked fine like it should. Then I tried building it for IOS and nothing worked I just got a white screen. So I made a test app which just the ZeroConf Plugin in it and fetching something completely simple.

zeroconf.watch('_scanassist._tcp.', 'local.').subscribe(result => {
   console.log('SOMETHING WAS FOUND!')
   alert('SOMETHING WAS FOUND')
 });

Just tested it on Android and everything worked like usually but when on IOS it does not. I execute this code in the constructor on my main page, could that be the problem? After that I put it in a setTimeout and the side loaded but Zeroconf did not give me an alert even it should give me one.

Link to Ionic Native Page: https://ionicframework.com/docs/native/zeroconf/

Answer 1

I've not used Ionic ZeroConf but have had quite a few issues with https://github.com/balthazar/react-native-zeroconf and ios.

We were unable to discover MDNS services on iOS with react-native-zeroconf, however, after performing a scan via Fing (iOS app) we were able to discover and resolve successfully again with react-native-zeroconf.

I suspect this has something to do with the way ios caches MDNS records. ZeroConf does not seem to be able to flush outdated MDNS records on scan.

We ended up ditching ZeroConf on ios because it was notoriously unreliable and instead used customed .local address for ios.

We are still using ZeroConf on Android without issue.