Shouldn't the rosoct code be the following to specify a failure?
Compare with the instructions on the 
http://www.ros.org/wiki/rosoct#line-125 wiki 

function res = stringservcb(req)
res = req.create_response_();
if( strcmp(req.str,'dofail') ) % some arbitrary failure condition
	res = []; #<<<<<------- not req=[]
else
	res.str = [req.str '_a'];
end


And in the spirit of the examples, is there something other than the
following be needed to call the service?

req = rosoct_StringString();
req.str = "input";
response = rosoct_service_call('mytempserv', req);
#I would expect response.str == input_a



I'm trying this and it seems that the service is never actually triggering
the stringservcb callback.
When the "responder" (b_node) is active the caller takes 21 seconds to
receive a null response, while it only takes .002 seconds to receive the
null response when b_node is not running.
http://ros-users.122217.n3.nabble.com/file/n1481922/a_node a_node  
http://ros-users.122217.n3.nabble.com/file/n1481922/b_node b_node (yes there
is a package called rosoctlistener)
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