clear
Clears the service cache for a specific device or all devices.
Call this method when you know or suspect that a device's GATT services have changed (e.g., after a firmware update) and you want to force a fresh service discovery on the next connection.
This is a static method that affects the global service cache shared by all ConnectionStateMachine instances.
Parameters
device
The MAC address of the device whose cache should be cleared. If null, clears the cache for all devices.