The problem is i don’t know what i exactly did, since i tried a lot and only started working after upgrading to openhab v3. I don’t know what you are running, i assume it is debian linux.
If you are running a raspberry there probably is a bluetooth howto on the internet.
But here is what i think you should do:
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Make sure your usb bluetooth is supported by linux.
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Install bluez if not installed.
There is a lot of info to downgrade bluez to a version betweer 5.43 and 5.47. This is not necesary anymore with openhab v3.
Try this manual:
Bluetooth on Debian or Ubuntu - Some Dude Says -
Follow this manual to configure for openhab:
Bluetooth BlueZ Adapter - Bindings | openHAB -
I would backup your current openhab config.
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Upgrade to openhab v3.
Guide: Installing and testing OH3 snapshots/milestones using APT and YUM -
Add the bluetooth binding using the UI if not already there.
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I already did a manual setup with openhab v2.xx which is a hassle, and openhab v3 picked it up just fine, but openhab 3 should just autodiscover the am43.