NDN-CCL

When creating an Interest if InterestLifetime is not explicitly set before calling Face.expressInterest() the onTimeout callback is never executed.

In Node.java the method expressInterestHelper() only sets up the timeout callback if InterestLifetime >= 0. Since InterestLifetime == -1 if not specified, the timeout callback is ignored.

I think this is a bug, and was certainly unexpected, since I had read at http://named-data.net/doc/NDN-TLV/current/interest.html#interestlifetime that the default timeout for an Interest would be 4 seconds if a timeout was not specified. I was expecting that the jndn library would call my timeout handler after 4 seconds. It seems that the correct behavior should be to use a (local) InterestLifetime of 4 seconds in expressInterestHelper() if InterestLifetime == -1.

I have attached a simple test case showing this issue.