# Bluetooth Low Energy

Integration Key: bluetoothLowEnergy

The Bluetooth Low Energy (BLE) integration scans for advertisement packets that other devices, like iBeacon or Bluetooth tags, emit. You can use any of the many different BLE tags or smart armbands out there, as long as they send out a constant ID. An example would be the RadBeacon Chip (opens new window) or the iB001W (opens new window). You can use Google or your favorite tech hardware store to find many other products like them that would also work.

The integration calculates an estimated distance in meters for all advertisements it receives and uses that to update the current location of the device. Since there are many factors at play these estimations are not exact measurements, especially once there are obstructions between the BLE device and room-assistant instance. The best accuracy can be achieved with properly configured iBeacons. The distance value is smoothed using a Kalman filter (opens new window) to limit the impact of measurement noise.

# Requirements

TIP

Using this together with Bluetooth Classic on the same adapter works, but will slightly degrade the performance. If you encounter issues you can try to run to run the integrations from different HCI devices.

This integration requires a BLE capable Bluetooth adapter. Most modern boards like the Raspberry Pi Zero W have an integrated adapter that is suitable. Any Bluetooth USB stick with BLE and Linux support should also work.

# Running with NodeJS

Apart from that you are also required to have a few more system packages installed:

sudo apt-get install bluetooth bluez libbluetooth-dev libudev-dev
sudo npm i --global --unsafe-perm room-assistant

If you want to run room-assistant without root privileges (as it is recommended) you also need to give NodeJS the correct permissions:

sudo setcap cap_net_raw+eip $(eval readlink -f `which node`)

# Running with Docker

This integration requires you to run room-assistant in the host network.

# Determining the IDs

In order to not clutter your home automation software with the many BLE devices broadcasting their status nearby, room-assistant requires you to set up a whitelist or blacklist before it will pass on any information. For regular BLE devices this is the lowercase MAC address without :, for example 7750fb4dab70 for a peripheral with the MAC address 77:50:FB:4D:AB:70. When using iBeacons the ID will be in the format of uuid-major-minor, for example 2f234454cf6d4a0fadf2f4911ba9ffa6-1-2.

If you are unsure what ID your device has you can start room-assistant with the BLE integration enabled, but no whitelist. Devices that are seen for the first time after starting will be logged with their ID to the console.

# Settings

Name Type Default Description
whitelist Array A list of BLE tag IDs that should be tracked.
whitelistRegex Boolean false Whether the whitelist should be evaluated as a list of regular expressions (opens new window) or not.
blacklist Array A list of BLE tag IDs that should not be tracked. If an ID matches both whitelist and blacklist it will not be tracked.
blacklistRegex Boolean false Whether the blacklist should be evaluated as a list of regular expressions (opens new window) or not.
processIBeacon Boolean true Whether additional data from iBeacon devices should be taken into account or not. Affects tag IDs and distance estimation.
onlyIBeacon Boolean false Whether only iBeacons should be considered when scanning for devices ot not.
timeout Number 5 The time after which a recorded distance is considered outdated. This value should be higher than the advertisement frequency of your peripheral.
updateFrequency Number 0 Minimum amount of seconds that should be waited between distance updates for each tag. The default value disables the throttling.
maxDistance Number Limits the distance at which a received BLE advertisement is still reported if configured. Value is in meters.
majorMask Number 0xffff Filter out bits of the major ID to make dynamic tag IDs with encoded information consistent for filtering.
minorMask Number 0xffff Filter out bits of the minor ID to make dynamic tag IDs with encoded information consistent for filtering.
batteryMask Number 0x00000000 If non-zero, extract the beacon's battery level from the major/minor fields. The mask operates on a 32bit value with major as the high two bytes and minor as the low two bytes.
tagOverrides Tag Overrides Allows you to override some properties of the tracked devices.
hciDeviceId Number 0 ID of the Bluetooth device to use for the inquiries, e.g. 0 to use hci0.

# Tag Overrides

The tag overrides object can be considered as a map with the BLE tag ID as key and an object with some of the following settings as value.

Name Type Default Description
name String Sets a friendly name for the device, which is sent to the home automation software for easier identification.
measuredPower Number Overrides the measured power (opens new window) of a BLE tag, which is used for distance calculation. Should be the expected RSSI when the beacon is exactly 1 meter away from the room-assistant instance.
batteryMask Number 0x00000000 If non-zero, extract the beacon's battery level from the major/minor fields. The mask operates on a 32bit value with major as the high two bytes and minor as the low two bytes.
Example Config
global:
  integrations:
    - bluetoothLowEnergy
bluetoothLowEnergy:
  whitelist:
    - 7750fb4dab70
    - 2f234454cf6d4a0fadf2f4911ba9ffa6-1-2
  maxDistance: 7
  tagOverrides:
    7750fb4dab70:
      name: Cool BLE Tag
      measuredPower: -61
      batteryMask: 0x0000FF00
Multiple Bluetooth Integrations Example Config

hciDeviceId can be used to choose a different Bluetooth adapter than the default one. Use hciconfig from the command line to see all available Bluetooth adapters. This may be useful when using Bluetooth Classic and Bluetooth Low Energy at the same time, as you could then have BLE passive scanning enabled at all times instead of just when no Bluetooth Classic inquiry is running.

global:
  integrations:
    - bluetoothClassic
    - bluetoothLowEnergy
bluetoothClassic:
  hciDeviceId: 0
  addresses:
    - '08:05:90:ed:3b:60'
    - '77:50:fb:4d:ab:70'
bluetoothLowEnergy:
  hciDeviceId: 1
  whitelist:
    - 7750fb4dab70
    - 2f234454cf6d4a0fadf2f4911ba9ffa6-1-2
Last Updated: 11/29/2020, 6:12:09 PM