Get Token status about firebase-esp8266

[mobizt]

The current auth token can be obtained from Firebase.getToken().

You can check its status with.

Firebase.authenticated() <- returns Firebase authentication status
Firebase.isTokenExpired() <- returns token expiry status

Firebase.ready() <- returns authentication status AND token expiry status AND network status.

<FirebaseData>.httpConnected() returns server connecting state in almost present time.

Normally, library will refresh the token 5 minutes before it expires (60 - 5 or every 55 minutes). You can set the token refresh time earlier than that default value, e.g., refresh in 10 minutes since it created with.

config.signer.preRefreshSeconds = 3600 - 10 * 60;

Or you want to refresh token immediately with.
Firebase.refreshToken(&config);