This flow shows how to use Z-wave node with homekit and possible other sources that could turn on and off the Z-wave node. The hardware is a Z-wave node controlled through a Z-wave USB stick. Homekit node is added to have Z-wave status in the home app in iphone and get support for siri. The Z-wave node can be controlled with siri or in the home app. It can also be controlled with input from any other node that can send payload of 0 or 1. Also if the lamp button on the wall is switched the homekit status will change.
Found a small bug and is fixed. My zwave sometimes received more than one answer from the hardware node into the zwave in node.