notify subscriptions after refresh

[sdandois]

Overview

Related to #591 #557

I've experienced problems with useNetInfo and location permissions. I'm using Android 11 and my app only has location permissions when the app is in foreground.

If the network changes while the app is in background bssid and ssid values are not being reported (or obfuscated). When the app comes back to foreground, no events are being triggered.

To handle that case, I've triggered NetInfo.refresh() when the appState becomes active again. However, this doesn't update the useNetInfo state. To force the update, I've added the event dispatch after updating _lastState.

Test Plan

1. Run on a phone with Android 11 (10 I think is the same thing).

2. Add this code to see updates to netInfo.

const netInfo = useNetInfo();
useEffect(() => {
  console.log('net info ssid is updated', netInfo?.details?.ssid) 
  

}, [netInfo?.details?.ssid])

3. Go to settings and change to another wifi network and wait around 10 seconds.

4. Net info ssid is updated with null

5. Go back to the app: No changes are triggered.

6. Add:

  const appState = useAppState();
  useEffect(() => {
    if (appState === 'active') {
      NetInfo.refresh();
    }
  }, [appState]);

With this code and my changes after coming back to the app, the ssid and bssid are updated.

Details

"@react-native-community/netinfo@": "9.3.2"
react-native: 0.67.3

SO Android 11.

[sdandois]

Also related to #538 . @mikehardy, I hope this change is suitable for you.

[mikehardy]

This seems very reasonable, and the test case you laid out is excellent - thank you!

[sdandois]

This seems very reasonable, and the test case you laid out is excellent - thank you!

Thank you for maintaining the library :)

[matt-oakes]

🎉 This PR is included in version 9.3.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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