Feature request: add partially-lock function for Lock Ultra

[CodeFinder2]

In the app, there is the feature of only partially locking the lock. Not sure if this is EU related. My Lock Ultra is on firmware v2.6. There is no "partial lock" functionality in HA / this library and it would be very useful as I prefer to not lock my door (lock) completely (not necessary, safes battery, faster, less noise).

Is this possible?

[shrinathaithal]

+1 to this.

I've been looking into this and analyzed the existing BLE command structure in lock.py.

All lock/unlock commands share the same prefix ({COMMAND_HEADER}0f4e0101), with the only difference being the final byte:

• 00 → lock
• 80 → unlock (with unlatch)
• a0 → unlock (without unlatch)

This looks like a bitmask. A partial lock command almost certainly follows the same pattern with a different final byte, and since the Switchbot app can trigger a partial lock on Lock Ultra, the command definitely exists.

Has anyone managed to capture the BLE traffic when triggering a partial lock from the app? An Android HCI snoop log would do the trick. Or if anyone has access to Switchbot's BLE protocol docs, that would be even better.

I'd love to have HA do partial locking if possible, would greatly work with my automations.