Close a session from the device side and push a closed event.
Open session.
Optionalreason: stringClose reason. Default device disconnected.
false when the session is unknown or already closed.
Push a notification for a subscribed characteristic.
Open session.
Characteristic UUID (any BleUuid form) or a full attribute.
Byte values 0..255.
false when the session, characteristic, subscription, bytes, or
delivery path is missing.
BLE mock with device-side controls.