Device was recognised but not now

I have a raspberry P13 B+ which I setup a rgb led strip to run with or by npm. It was to work with apples’ homekit.
When I first connected to the Home Assistant from a web browser, the said rgb strip was showing up, and I entered the pairing code for it. This seemed to take sometime to ok, so I left it running.
On return to home assistant, the rgb strip had disappeared from the list of devices, so how do I get it back.