How to use

openReceiver

method

in

org.eclipse.hono.client.AuthenticationServerClient

private void getToken(final ProtonConnection openCon, final Future<HonoUser> authResult) {
  final ProtonMessageHandler messageHandler = (delivery, message) -> {
    final String type = MessageHelper.getApplicationProperty(
        message.getApplicationProperties(),
        AuthenticationConstants.APPLICATION_PROPERTY_TYPE,
        String.class);
    if (AuthenticationConstants.TYPE_AMQP_JWT.equals(type)) {
      final String payload = MessageHelper.getPayloadAsString(message);
      if (payload != null) {
        final HonoUser user = new HonoUserAdapter() {
          @Override
          public String getToken() {
            return payload;
          }
        };
        LOG.debug("successfully retrieved token from Authentication service");
        authResult.complete(user);
      } else {
        authResult.fail("message from Authentication service contains no body");
      }
    } else {
      authResult.fail("Authentication service issued unsupported token [type: " + type + "]");
    }
  };
  openReceiver(openCon, messageHandler).compose(openReceiver -> {
    LOG.debug("opened receiver link to Authentication service, waiting for token ...");
  }, authResult);
}