anchor.diff:      case log_ok(gen_sctp:recv(Sb, infinity)) of
   	{Loopback,
   	 Pa,
  -	 [#sctp_sndrcvinfo{stream=Stream,
  -			   assoc_id=SbAssocId}],
  -	 Data} -> ok;
  +	 [#sctp_sndrcvinfo{stream   = Stream,
  +			   assoc_id = SbAssocId}],
  +	 Data} ->
  +            p("[1] received expected data with ancillary data => done"),
  +            ok;
  +
   	{Loopback,
   	 Pa,
            [],
  
positive.code: 			    state    = addr_confirmed,
  			    error    = 0,
  			    assoc_id = SbAssocId}} ->
  	    {Loopback,
  	     Pa,
  	     [#sctp_sndrcvinfo{stream   = Stream,
  			       assoc_id = SbAssocId}],
  	     Data} = log_ok(gen_sctp:recv(Sb, infinity));
          {FromIPX, FromPortX, AncDataX, DataX} = Other1 ->
              p("UNEXPECTED: "
                "~n   FromIP:   ~p"
  
negative.code: 			    state    = addr_available,
  			    error    = 0,
  			    assoc_id = SbAssocId}} ->
              p("[2] received paddr change => recv again"),
              Res2 = log_ok(gen_sctp:recv(Sb, infinity)),
              p("[2] recv ok => "
                "~n   ~p", [Res2]),
  	    {Loopback,
  	     Pa,
  	     [#sctp_sndrcvinfo{stream   = Stream,
  			       assoc_id = SbAssocId}],
  	     Data} = Res2,
              p("[2] received expected data with ancillary data => done"),
              Res2;
  
  	{Loopback,
  	 Pa,
  	 [#sctp_sndrcvinfo{stream    = Stream,
  