DTLS implementation crashes and a slight fix #2
Description
This library uses Bouncy castle for DTLS management, this library is Blocking and not thread save, the transport receives are still called in new Tasks tho. This leads to session crashes as soon as package size varies, as bouncy castle tries to write content into a wrong (to small) buffer.
The best solution would be to actually use a non blocking library, but for now I implemented some changes, so that this particular issue wouldn't rise again. I changed the waitmillis for the transport to 1, as "0" isn't support in bouncy castle anymore. The fire method for the CoAP part runs in a seperate Task now, as waiting for it would also interfere with our DTLS business.
This should work if the session isn't sending packages within nanoseconds, you can pull from my branch.
https://github.com/ds600/CoAP.NET-DTLS-changes