bpsServerDest =
DestinationFactory.createNonBlockingSenderDestination(
_context, URI.create(contentUri),
subscriptionListener);
final ByteMessage subscrMsg =
BpsSubscriptionMessageBuilder
.createByteSubscriptionMessage(bpsServerDest,
listenDest, "user", "pwd");
((HttpMessage) subscrMsg).setQueryParam("field1", "xxxxx");