ACLMessage msg = new ACLMessage(ACLMessage.QUERY_REF);
msg.setSender(getAID());
AID aclPing = new AID("acl_ping", true);
aclPing.setName("acl_ping@beta.lausanne.agentcities.net");
aclPing.addAddresses("http://srv02.lausanne.agentcities.net:8080/acc");
msg.addReceiver(aclPing);
msg.setReplyWith("Req" + (new Date()).getTime());
msg.setConversationId("Req" + (new Date()).getTime());
msg.setContent("ping");