How to use

HonoClientBasedAuthProvider

in

org.eclipse.hono.service.auth.device

private Future<DeviceUser> authenticate(final DeviceCredentials credentials, final Span currentSpan) {
  final Future<DeviceUser> result = Future.future();
  usernamePasswordAuthProvider.authenticate(credentials, handler -> {
    if (handler.succeeded()) {
      final DeviceUser authenticatedDevice = handler.result();
      currentSpan.log("device authenticated");
      LOG.debug("successfully authenticated device [tenant-id: {}, auth-id: {}, device-id: {}]",
          authenticatedDevice.getTenantId(), credentials.getAuthId(),
          authenticatedDevice.getDeviceId());
      result.complete(authenticatedDevice);
    } else {
      LOG.debug("Failed to authenticate device [tenant-id: {}, auth-id: {}] ",
          credentials.getTenantId(), credentials.getAuthId(), handler.cause());
      result.fail(handler.cause());
    }
  });
  return result;
}

  final String tenantId = tenantTracker.result().getTenantId();
  final SubjectDnCredentials credentials = SubjectDnCredentials.create(tenantId, deviceCert.getSubjectX500Principal());
  getCertificateAuthProvider().authenticate(credentials, currentSpan.context(), completer);
  return null;
}).otherwise(t -> {

  getUsernamePasswordAuthProvider().authenticate(credentials, currentSpan.context(), completer);
} else {
  completer.handle(Future.failedFuture(new CredentialException(