Not using zipgateway,directly using serial api for hcapi 7.15.1
While the Z-Wave alliance now allows for certification of non Z/IP Gateway based controllers, the documentation for the serial API has not yet been released, while it is in progress.
Even though it is now allowed to develop directly on the serial API, I would encourage you to consider carefully whether this is what you really want. Developing a host application on this interface requires significantly more effort, as basic functionality such as mandatory support for S2 encryption will have to be implemented by your host application.
Certifying a controller solution not based on Z/IP Gateway is also significantly more expensive as the security testing is more complex.
The documentation is now available from the Z-Wave alliance in the "core stack working group. Z-Wave Alliance Login is required.