@gwp1 I have no doubts that MSR is a great tool for sure when you use more than one platform.
But sorry I repeat myself... my goal is to only use Home Assistant in the near future and I will migrate step by step from Vera.
If I can not do all automations in HA I will most certainly seriously consider combining HA with MSR.
In the meantime I have found the answers on my question myself.
http luup request to get values of sensor data/variables from Vera.
Example for a rain sensor:
http://192.168.1.xxx:3480/data_request?id=variableget&DeviceNum=xx&serviceId=urn:upnp-org:serviceId:RainSensor1&Variable=CurrentRain
Within Home Assistant I created RESTful sensors to get the data in.
And it works great.