got it 
thank you, for your help
for other, who may be interested: here are my steps
//1. - configure NUKI Smartlock without NUKI bridge
install and configure Smartlock
activate MQTT
lookup ID for MQTT-channel (on your mqtt broker)
→ in my case on a RasPi
mosquitto_sub -v -h localhost -p 1883 -t 'nuki/#'
initiate a publish via APP or just press the button on your smartlock
mqtt result:
nuki/12A345B5/timestamp
→ 12A345B5 is your ID
//2. - create Thing (Web-UI)
openhab → Things → + → MQTT-Binding → Generic MQTT Thing
Unique ID: <myNUKIlock>
Identifier: mqtt:topic:<myNUKIlock>
Label: <myNUKIlock>
Bridge: MQTT Connection to local MQTT Broker (has to be configured already)
…Create Thing
//3. - configure Thing - set Channels (Web-UI)
openhab → Things → myNUKIlock → Code
paste following code:
channels:
- id: connected
channelTypeUID: mqtt:switch
label: connected
description: null
configuration:
stateTopic: nuki/12A345B5/connected
off: "false"
on: "true"
- id: devicetype
channelTypeUID: mqtt:number
label: devicetype
description: null
configuration:
stateTopic: nuki/12A345B5/deviceType
- id: name
channelTypeUID: mqtt:string
label: name
description: null
configuration:
stateTopic: nuki/12A345B5/name
- id: serverconnected
channelTypeUID: mqtt:switch
label: serverconnected
description: null
configuration:
stateTopic: nuki/12A345B5/serverConnected
off: "false"
on: "true"
- id: state
channelTypeUID: mqtt:number
label: state
description: null
configuration:
stateTopic: nuki/12A345B5/state
- id: mode
channelTypeUID: mqtt:number
label: mode
description: null
configuration:
stateTopic: nuki/12A345B5/mode
- id: battcritic
channelTypeUID: mqtt:switch
label: battcritic
description: null
configuration:
stateTopic: nuki/12A345B5/batteryCritical
off: "false"
on: "true"
- id: battcharge
channelTypeUID: mqtt:number
label: battcharge
description: null
configuration:
stateTopic: nuki/12A345B5/batteryChargeState
- id: battcharging
channelTypeUID: mqtt:switch
label: battcharging
description: null
configuration:
stateTopic: nuki/12A345B5/batteryCharging
off: "false"
on: "true"
- id: lastseen
channelTypeUID: mqtt:datetime
label: lastseen
description: null
configuration:
stateTopic: nuki/12A345B5/timestamp
- id: lock
channelTypeUID: mqtt:switch
label: lock
description: null
configuration:
commandTopic: nuki/12A345B5/lock
off: "false"
on: "true"
- id: unlock
channelTypeUID: mqtt:switch
label: unlock
description: null
configuration:
commandTopic: nuki/12A345B5/unlock
off: "false"
on: "true"
- id: lockaction
channelTypeUID: mqtt:string
label: lockaction
description: null
configuration:
commandTopic: nuki/12A345B5/lockAction
- id: firmware
channelTypeUID: mqtt:string
label: firmware
description: null
configuration:
stateTopic: nuki/12A345B5/firmware
- id: actionevent
channelTypeUID: mqtt:string
label: actionevent
description: null
configuration:
stateTopic: nuki/12A345B5/lockActionEvent
- id: doorsensor
channelTypeUID: mqtt:number
label: doorsensor
description: null
configuration:
stateTopic: nuki/12A345B5/doorsensorState
replace 12A345B5 with your ID from step 1
//4. - generate items (Web-UI/VSC)
method1 (VSC):
create NUKI.items in VSC
paste following code
method2: (Web-UI)
openhab → Things → myNUKIlock → Channels → Add Points to Model → Expert Mode
paste following code
Group <myNUKIlock> "<myNUKIlock>"
Switch <myNUKIlock>_connected "connected" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:connected" }
Number <myNUKIlock>_devicetype "devicetype" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:devicetype" }
String <myNUKIlock>_name "name" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:name" }
Switch <myNUKIlock>_serverconnected "serverconnected" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:serverconnected" }
Number <myNUKIlock>_state "state" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:state" ,stateDescription=" "[options="0=nicht kalibriert,1=Verriegelt,2=schließt auf,3=Entriegelt,4=schließt ab,5=Offen,6=lock'n'go,7=kann geöffnet werden,254=Motor blockiert,255=Undefiniert"]}
Number <myNUKIlock>_mode "mode" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:mode" }
Switch <myNUKIlock>_battcritic "battcritic" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:battcritic" }
Number <myNUKIlock>_battcharge "battcharge" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:battcharge" }
Switch <myNUKIlock>_battcharging "battcharging" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:battcharging" }
DateTime <myNUKIlock>_lastseen "lastseen" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:lastseen" }
Switch <myNUKIlock>_lock "lock" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:lock" }
Switch <myNUKIlock>_unlock "unlock" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:unlock" }
String <myNUKIlock>_lockaction "lockaction" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:lockaction" ,stateDescription=" "[options="1=aufschließen,2=abschließen,3=öffnen,4=lock'n'go,5=lock'n'go mit öffnen,6=2 x abschließen,NULL=unbekannt"]}
String <myNUKIlock>_firmware "firmware" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:firmware" }
//String <myNUKIlock>_actionevent "actionevent" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:actionevent" }
//Number <myNUKIlock>_doorsensor "doorsensor" (<myNUKIlock>) ["Point"] { channel="<mqtt:topic:yourMQTTbroker:myNUKIlockUID>:doorsensor" }
maybe replace <myNUKIlock> with your desired Name
maybe replace <mqtt:topic:yourMQTTbroker:myNUKIlockUID> with UID/Identifier from thing created in step 2
maybe translate the German stateDescription
//5. - Button Example (Web-UI)
openhab → Pages → + → Add Label-Card
component: oh-label-card
config:
action: options
actionItem: <myNUKIlock>_lockaction
item: <myNUKIlock>_state
title: <myNUKIlock>