// Set the specified affiliation. This may request the list of owners/admins/members/outcasts.
MUCAdmin.Item item = new MUCAdmin.Item(affiliation, null);
iq.addItem(item);
// Wait for a response packet back from the server.
PacketFilter responseFilter = new PacketIDFilter(iq.getPacketID());
PacketCollector response = connection.createPacketCollector(responseFilter);
// Send the request to the server.
connection.sendPacket(iq);
// Wait up to a certain number of seconds for a reply.
MUCAdmin answer = (MUCAdmin) response.nextResult(SmackConfiguration.getPacketReplyTimeout());