Sign in with an existing account

// This is a synchronous client, that will block until the response arrive (or until timeout)
TelegramClient client = Kotlogram.getDefaultClient(application, new ApiStorage());

// You can start making requests
try {
    // Send code to account
    TLSentCode sentCode = client.authSendCode(false, PHONE_NUMBER, true);
    System.out.println("Authentication code: ");
    String code = new Scanner(System.in).nextLine();

    // Auth with the received code
    TLAuthorization authorization = client.authSignIn(PHONE_NUMBER, sentCode.getPhoneCodeHash(), code);
    TLUser self = authorization.getUser().getAsUser();
    System.out.println("You are now signed in as " + self.getFirstName() + " " + self.getLastName() + " @" + self.getUsername());
} catch (RpcErrorException | IOException e) {
    e.printStackTrace();
} finally {
    client.close(); // Important, do not forget this, or your process won't finish
}