This patch fixes a few issues with messages in the CoapEndpoint.
Fixed some memory leaks, where exchanges were not properly deleted from HashMaps in the Matcher, including piggy-backed responses and NON-notifications.
Fixed an issue where the CoapClien was not able to cancel an observe relation
Fixed issue #7 to allow using block options for random access. One question remains (see discussion about issue #7)
With all fixes come JUnit tests to ensure that they do not break again in the future.
This patch fixes a few issues with messages in the CoapEndpoint.
With all fixes come JUnit tests to ensure that they do not break again in the future.