Connecting Roborock S7 to Home Assistant

Written 2022-01-07 by Kalle
2 min read | 296 words

Intro

Connecting my Roboroskc S7 to Home Assistant was trickier than I imagined, so now that it's finally working, I don't want to forget the gained knowledge.

Network setup

Given that Roborock is a Chinese brand, I decided to keep it on a VLAN separate from my main VLAN where Home Assistant resides.

Using Unifi, I configured my static IPs as follows:

Home Assistant on main VLAN: 192.168.1.221
Roborock on IoT VLAN: 192.168.20.7

Connecting the Roborock to Home Assistant

I followed the following guide: https://smarthomepursuits.com/how-to-setup-configure-roborock-s7-with-home-assistant/. It went smoothly until I tried to add the Roborock to HA using the Xiaomi Miio addon. The Roborock was discovered and added as an integration, but a connection to it could not be established.

Some googling revealed that the issue is that the vacuum is on other subnet than HA:

The suggested solution was to use NAT masquerading to trick the Roborock into believing that HA is on the same subnet as the Roborock.

NAT masquerading in Unifi USG using config.gateway.json

Puzzling together info from these two sites gave me the solution:

https://github.com/rytilahti/python-miio/issues/422
https://community.home-assistant.io/t/roborock-s7-entity-always-unavailable/330361

Save the following to config.gateway.json:

{
"service": {
"nat": {
  "rule": {
    "5010": {
      "description": "MASQ NAT HomeAssistant -> Roborock group",
      "destination": {
        "address": "192.168.20.7/24"
      },
      "log": "disable",
      "outbound-interface": "eth1.20",
      "protocol": "all",
      "source": {
        "address": "192.168.1.221/24"
      },
      "type": "masquerade"
    }
  }
}
}
}