IdentityKeyPair    identityKey        = KeyHelper.generateIdentityKeyPair();
List<PreKeyRecord> oneTimePreKeys     = KeyHelper.generatePreKeys(0, 100);
PreKeyRecord       lastResortKey      = KeyHelper.generateLastResortPreKey();
SignedPreKeyRecord signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKey, signedPreKeyId);

private final String     URL         = "https://my.signal.server.com";
private final TrustStore TRUST_STORE = new MyTrustStoreImpl();
private final String     USERNAME    = "+14151231234";
private final String     PASSWORD    = generateRandomPassword();
private final String     USER_AGENT  = "[FILL_IN]";

SignalServiceAccountManager accountManager = new SignalServiceAccountManager(URL, TRUST_STORE,
                                                                             USERNAME, PASSWORD, USER_AGENT);

accountManager.requestSmsVerificationCode();
accountManager.verifyAccountWithCode(receivedSmsVerificationCode, generateRandomSignalingKey(),
                                     generateRandomInstallId(), false);
accountManager.setGcmId(Optional.of(GoogleCloudMessaging.getInstance(this).register(REGISTRATION_ID)));
accountManager.setPreKeys(identityKey.getPublicKey(), lastResortKey, signedPreKeyRecord, oneTimePreKeys);

SignalServiceMessageSender messageSender = new SignalServiceMessageSender(URL, TRUST_STORE, USERNAME, PASSWORD,
                                                                          new MySignalProtocolStore(),
                                                                          USER_AGENT, Optional.absent());

messageSender.sendMessage(new SignalServiceAddress("+14159998888"),
                          SignalServiceDataMessage.newBuilder()
                                                  .withBody("Hello, world!")
                                                  .build());

SignalServiceMessageSender messageSender = new SignalServiceMessageSender(URL, TRUST_STORE, USERNAME, PASSWORD,
                                                                          new MySignalProtocolStore(),
                                                                          USER_AGENT, Optional.absent());

File                    myAttachment     = new File("/path/to/my.attachment");
FileInputStream         attachmentStream = new FileInputStream(myAttachment);
SignalServiceAttachment attachment       = SignalServiceAttachment.newStreamBuilder()
                                                                  .withStream(attachmentStream)
                                                                  .withContentType("image/png")
                                                                  .withLength(myAttachment.length())
                                                                  .build();

messageSender.sendMessage(new SignalServiceAddress("+14159998888"),
                          SignalServiceDataMessage.newBuilder()
                                                  .withBody("An attachment!")
                                                  .withAttachment(attachment)
                                                  .build());

SignalServiceMessageReceiver messageReceiver = new SignalServiceMessageReceiver(URL, TRUST_STORE, USERNAME,
                                                                                PASSWORD, mySignalingKey,
                                                                                USER_AGENT);
SignalServiceMessagePipe     messagePipe     = null;

try {
  messagePipe = messageReceiver.createMessagePipe();

  while (listeningForMessages) {
    SignalServiceEnvelope envelope = messagePipe.read(timeout, timeoutTimeUnit);
    SignalServiceCipher   cipher   = new SignalServiceCipher(new SignalServiceAddress(USERNAME),
                                                             new MySignalProtocolStore());
    SignalServiceContent  message  = cipher.decrypt(envelope);

    System.out.println("Received message: " + message.getDataMessage().get().getBody().get());
  }

} finally {
  if (messagePipe != null)
    messagePipe.shutdown();
}