assertWhat( What.UP, dh.what );
assertNull( dh.xsender );
assertNull( dh.xbuf );
c.transportData( null, new FlexBuffer( new byte[] { 21, 22, 23 } ) );
// c.flush();
assertEquals( 21, read( t ) );
assertEquals( 22, read( t ) );
assertEquals( 23, read( t ) );