This program attempts to connect to an Ensto ECO16BT (possibly also other models such as ECO10BTW, ELTE6-BT, EPHE5-BT) Bluetooth thermostat and read temperature and other data.

The output is JSON data (prettified here for clarity):

{
    "address": "90:fd:9f:12:34:56",
    "deviceName": "Livingroom",
    "relayIsOn": false,
    "roomTemperature": 20.5,
    "targetTemperature": 19.5,
    "timestamp": "2021-12-31T12:34:56.789Z"
}

• RPi 3 Model B v1.2
• Raspbian 10
• Node 16.13.0

• Follow noble installation instructions here: https://www.npmjs.com/package/@abandonware/noble#installation
• run npm i
• run node ensto-bt-thermostat-reader.js for pairing and other instructions

See the usage function in ensto-bt-thermostat-reader.js for a list of known bugs.

The document Ensto_BT_IOT_interface_specification.pdf (not anymore available at Ensto website) was used to find out UUIDs and other functionality. Same information could have been obtained by reverse engineering the Ensto Heat mobile app.