Hey, not really a solution to your problem, but I recently used stateless. There is a basic demo by @hadasi. It doesn’t have the convience of a gui editor. Other than that it worked out quite well and since you have already designed your statemachine, it should be “easy” to re-patch it.
One quirk: Stateless states must explicitly ignore triggers they shouldn’t react to otherwise they will raise an exception. In your case for example (from what I can see in the screenshot) InCalling, WaitingList and ConToOp should ignore OnTimeout3.
hth
