signIn method
Signs this connection in to a specific authentication scope.
Implementation
Future signIn(Map<String, dynamic> vars) {
final id = _generateId();
final completer = Completer();
_ws.ready.then((_) {
once(id, (res) => _signIn(res, completer));
_send(id, 'signin', [vars]);
});
return completer.future;
}