If all those devices are set up, you need to add each component into HA:
smart things is unque i guess, and from googling it looks like it needs to be integrated with MQTT. This looks like a guide, you may not need the Docker portion if you are using Hassio.
I have no clue what kasa is. I looked it up and it appears to be a bluetooth smart device. It doesn’t look like it has an integration with home assistant. You may need to get creative with this one.
vesync:
Once you get all the devices you want into home assistant, you then would create a template sensor that combines all the data using any equation you feel: