Add a new known issue caused by the underlying module

Author: dbaba

README.md

@@ -26,6 +26,7 @@ Known issues for Linux BlueZ D-Bus API:
 
 - Unlike the oler version, **you must set the process owner's permission properly and manually**. Non-root user's Node-RED process will fail to get this node working. Read `Installation Note (Linux)` below.
 - It seems the local name in advertisement packet isn't transferred to `LocalName` property in org.bluez.Device1 BlueZ D-Bus API. With the HCI socket implementaion, the local name was resolved. So the local name can be resolved on macOS and Windows.
+- `Bluetooth: hci0: hardware error 0x03` error sometimes occurs (and logged in syslog). When it's observed, all devices are disconnected and cahches are gone. The node tries to power on the BLE adapter again.
 
 # How to use