Connect to Return channel: ERROR

Question

Hi everyone,
I am testing return channel, using code as following:
try {
myRCInterface.reserve(null,null);
     myRCInterface.setTarget(new ConnectionParameters("1269", "vnn1269","vnn1269"));
     myRCInterface.connect();
//...Here is something for exchange data beetwen receiver and server
myRCInterface.disconnect();
     myRCInterface.release();
catch(IncompleteTargetException e)
     System.out.println("IncompleteTargetException: " + e.getMessage());
catch(PermissionDeniedException e)
     System.out.println("PermissionDeniedException: " + e.getMessage());
When i test this code on DTT-4500 stb, error occurs just at line myRCInterface.setTarget(...): PermissionDeniedException:null
I wonder if this code is wrong? or modem of my stb is fault?
Please tell me why this error occurs?
I also need help for DTT-4000 much. The function "Modem Test" of this stb always says "connected successfully" while dialing to any phone number (even unavailable numbers).
What i know is that DTT-4500 are sold mainly in Italia. If someone in Italia or have used this stb, please tell me how to setup modem for it.
Thanks alot,
Nghia.

Answer 1

hi,
this is quite weird, because it looks like resource reservation did not succeed. but failure to reserve should be reported during the call to reserve().
this looks pretty much like a bug in the stb (well, this is theoretically possible that something reserved the modem just after your reserve, but very unlikely), but maybe it has something to do with the NULL ResourceClient you pass to reserve() - i think you shouldnt do it, because behavior of reserve() with NULL argument is unspecified. I suggest you write something like
myRCInterface.reserve(new ResourceClient() { void notifyRelease(ResourceProxy proxy) { ... } ... and so on.
try this and see if it helps.
is this is development stb or one from a store shelf? i wonder because later you may hit SecurityException, as access to modem is restricted to applications signed with a certificate, which you will not have unless you have a dev. stb. i dont know that stb, but you may lucky because mhp security model didnt actually survive in the italian dtt market, so maybe there wont be any problem.
cheers