This section has two goals:

1. List the currently available firmware options for Home Assistant Yellow and Connect ZBT-1 (the two devices have the same radio chip built-in).
2. List the different add-ons and integrations related to these options and show their relationships.

Currently available firmware

There are currently 2 different firmware options for Home Assistant Yellow:

1. Zigbee firmware
   • This is the firmware that runs a Zigbee network. It is preinstalled on Connect ZBT-1 and Yellow.
   • Bundled in the Silicon Labs Flasher add-on. In case you have installed one of the other two options at some point, this add-on allows you to re-install the Zigbee firmware. Note that the add-on is only used to flash the firmware. It is never used during operation: ZHA communicates with the Zigbee firmware directly.
   • Other terms you may have seen to designate this firmware: EmberZNet firmware, EZSP firmware, Zigbee EZSP.
2. Thread firmware
   • This firmware allows to use Yellow or Connect ZBT-1 as a dedicated Thread border router when used with the Open Thread Border Router addon.
   • Bundled in the Open Thread Border Router add-on.
   • Other terms you may have seen to designate this firmware: OpenThread RCP, RCP OT

Overview of Zigbee and Thread firmware options, add-ons, and integrations in Home Assistant.

Chart illustrating the relationships between Zigbee and Thread firmware options, add-ons, and integrations in Home Assistant.

Related topics

• Zigbee Home Automation integration documentation
• Thread integration documentation