The Matlab utilities to interact with Slicer are not functioning, at least in my machine.
I still haven't debugged if there is an error due to version 3 of the protocol and the extra 14 bits added to the extender header (it should not affect the transform message according to the documentation in OpenIGTLink), making the implementation in matlab incompatible, or the size of the body of the message is not being interpreted correctly as a unsigned long with 64 bits.
If I find a solution in the meanwhile, I will share it in this issue.