init method
Implementation
Future<void> init() async {
final results = await _conn.checkConnectivity();
_isOnline = _hasConnection(results);
_sub = _conn.onConnectivityChanged.listen((results) {
final online = _hasConnection(results);
if (online != _isOnline) {
_isOnline = online;
_controller.add(_isOnline);
}
});
}