This Home Assistant custom component allows you to synchronize the time on one or more Xiaomi LYWSD02 Bluetooth clocks directly from Home Assistant.

• Sync the time on multiple Xiaomi LYWSD02 clocks with a single service call.
• Uses Bluetooth (via the bleak library) to communicate with devices.
• Simple service for manual or automated time sync.

1. Copy the files Place the xiaomi_clock_sync folder in your Home Assistant custom_components directory.

2. Enable in configuration.yaml file add the following line to configuration.yaml:

   xiaomi_clock_sync:

3. Restart Home Assistant After copying the files, restart Home Assistant to load the new component.

Note: You do not need to install the bleak library manually. Home Assistant will automatically install all required dependencies as specified in manifest.json.

add the following line to configuration.yaml:

xiaomi_clock_sync:

Sync the time on one or more Xiaomi LYWSD02 clocks.

Example:

service: xiaomi_clock_sync.sync_time
data:
  macs:
    - "A4:C1:38:XX:XX:XX"
    - "3F:5B:7D:XX:XX:XX"

You can call this service from Developer Tools, automations, or scripts.

• Ensure your Home Assistant host has a working Bluetooth adapter.
• The clocks must be powered on and within Bluetooth range.
• Connection slot errors: If you see BleakOutOfConnectionSlotsError, restart Home Assistant to release stuck BLE connections. BLE adapters typically support only 3-7 simultaneous connections.
• Wrong time (off by 1 hour): This was caused by incorrect DST detection and has been fixed. The component now correctly detects whether Daylight Saving Time is currently active using time.localtime().tm_isdst.

• Based on h4/lywsd02
• Uses the bleak Bluetooth library

MIT License