docs: private long sendMessage(SIBusMessage msg) throws OperationFailedException {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(this, tc, "sendMessage", msg);
  
          long retValue = 0;
  
          // If we are at FAP9 or above we can do a 'chunked' send of the message in seperate
          // slices to make life easier on the Java memory manager
          final HandshakeProperties props = getConversation().getHandshakeProperties();
          if (props.getFapLevel() >= JFapChannelConstants.FAP_VERSION_9) {
              retValue = sendChunkedMessage(msg);
          } else {
              retValue = sendEntireMessage(msg, null);
          }
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(this, tc, "sendMessage", "" + retValue);
          return retValue;
      }