setState is NOT thread safe and is not called from the real time thread. Of course this can depend on the host since it is the host doing the call. But since this call usually involves saving the state to storage, then it really should not be done on the real time thread and from my own experience it is not. I have not checked 3.7.3 yet (so I do not know about this RTTransfer class), but all examples provided with the (previous) SDKs are not thread safe…
There was a thread on this topic a while ago…