code: public static void send(XMPPConnection connection, Stanza packet, Collection<? extends Jid> to,
              Collection<? extends Jid> cc, Collection<? extends Jid> bcc) throws NoResponseException, XMPPErrorException,
              FeatureNotSupportedException, NotConnectedException, InterruptedException {
          send(connection, packet, to, cc, bcc, null, null, false);
      }
docs: Sends the specified stanza to the collection of specified recipients using the
  specified connection. If the server has support for XEP-33 then only one
  stanza is going to be sent to the server with the multiple recipient instructions.
  However, if XEP-33 is not supported by the server then the client is going to send
  the stanza to each recipient.
  
  @param connection the connection to use to send the packet.
  @param packet     the stanza to send to the list of recipients.
  @param to         the collection of JIDs to include in the TO list or <tt>null</tt> if no TO
  list exists.
  @param cc         the collection of JIDs to include in the CC list or <tt>null</tt> if no CC
  list exists.
  @param bcc        the collection of JIDs to include in the BCC list or <tt>null</tt> if no BCC
  list exists.
  @throws FeatureNotSupportedException if special XEP-33 features where requested, but the
  server does not support them.
  @throws XMPPErrorException if server does not support XEP-33: Extended Stanza Addressing and
  some XEP-33 specific features were requested.
  @throws NoResponseException if there was no response from the server.
  @throws NotConnectedException
  @throws InterruptedException