There are 2 repositories under eq3-bluetooth-thermostat topic.
node.js package to control an EQ3 bluetooth thermostat
Adapter zur Anbindung von eq3-Thermostaten via Bluetooth
Python library that allows interaction with eQ-3 Bluetooth smart thermostats.
ioBroker adapter to connect EQ3 CC-RT-BLE Thermostats. It allows setting the temperature and can poll the current status.