code: public void sendTyping(SignalServiceAddress recipient,
                           Optional<UnidentifiedAccessPair> unidentifiedAccess,
                           SignalServiceTypingMessage message)
        throws IOException, UntrustedIdentityException
    {
      byte[] content = createTypingContent(message);
  
      sendMessage(recipient, getTargetUnidentifiedAccess(unidentifiedAccess), message.getTimestamp(), content, true);
    }
docs: Send a typing indicator.
  
  @param recipient The destination
  @param message The typing indicator to deliver
  @throws IOException
  @throws UntrustedIdentityException