Ok, I removed the 1260E via karaf, since it did not work from the Paper UI.
Before this, the lsiting looked like this:
openhab> smarthome:things list
avmfritz:fritzbox:192_168_2_10 (Type=Bridge, Status=ONLINE: FRITZ!Box online, Label=AVM FRITZ!Mediaserver, Bridge=null)
astro:sun:local (Type=Thing, Status=ONLINE, Label=Local Sun, Bridge=null)
astro:moon:local (Type=Thing, Status=ONLINE, Label=Local Moon, Bridge=null)
avmfritz:FRITZ_DECT_200:192_168_2_10:087610053251 (Type=Thing, Status=ONLINE, Label=FRITZ!DECT 200 , Bridge=avmfritz:fritzbox:192_168_2_10)
ntp:ntp:local (Type=Thing, Status=ONLINE, Label=Local Time, Bridge=null)
avmfritz:FRITZ_DECT_Repeater_100:192_168_2_10:116570057984 (Type=Thing, Status=ONLINE, Label=FRITZ!DECT Rep 100, Bridge=avmfritz:fritzbox:192_168_2_10)
avmfritz:FRITZ_Powerline_546E_Solo:192_168_2_102 (Type=Thing, Status=REMOVING, Label=FRITZ!Powerline 1260E, Bridge=null)
Then, I added the 1260E via the Paper UI again. This is what the debug log tells me:
17:55:39.705 [DEBUG] [al.discovery.AVMFritzDiscoveryService] - initialize discovery service
17:55:39.710 [DEBUG] [al.discovery.AVMFritzDiscoveryService] - start background scanning job at intervall 180s
17:55:39.728 [DEBUG] [org.openhab.binding.avmfritz ] - ServiceEvent REGISTERED - {org.eclipse.smarthome.config.discovery.DiscoveryService}={service.id=370, service.bundleid=224, service.scope=singleton} - org.openhab.binding.avmfritz
17:55:39.956 [DEBUG] [very.AVMFritzUpnpDiscoveryParticipant] - discovered on /192.168.2.100
17:55:39.961 [DEBUG] [very.AVMFritzUpnpDiscoveryParticipant] - discovered: AVM Berlin FRITZ!Box 6490 Cable avm (FRITZ!Box 6490 Cable) at 192.168.2.10
17:55:39.970 [DEBUG] [very.AVMFritzUpnpDiscoveryParticipant] - discovered on /192.168.2.100
17:55:39.977 [DEBUG] [very.AVMFritzUpnpDiscoveryParticipant] - discovered: AVM Berlin FRITZ!Powerline 1260E avm (FRITZ!Powerline 1260E) at 192.168.2.102
17:55:39.985 [DEBUG] [al.discovery.AVMFritzDiscoveryService] - stop manual scan on bridge avmfritz:FRITZ_Powerline_546E_Solo:192_168_2_102
17:55:39.989 [DEBUG] [al.discovery.AVMFritzDiscoveryService] - stop manual scan on bridge avmfritz:fritzbox:192_168_2_10
17:55:39.992 [DEBUG] [al.discovery.AVMFritzDiscoveryService] - start manual scan on bridge avmfritz:fritzbox:192_168_2_10
17:55:39.997 [DEBUG] [nternal.hardware.FritzAhaWebInterface] - GETting URL http://192.168.2.10/webservices/homeautoswitch.lua?switchcmd=getdevicelistinfos&sid=8114ff89323a6ede
17:55:40.133 [DEBUG] [rnal.hardware.FritzAhaContentExchange] - HTTP response 200
17:55:40.137 [DEBUG] [rnal.hardware.FritzAhaContentExchange] - HTTP response 200
17:55:40.140 [DEBUG] [rnal.hardware.FritzAhaContentExchange] - response complete: <devicelist version="1"><device identifier="11657 0057984" id="17" functionbitmask="1280" fwversion="03.86" manufacturer="AVM" productname="FRITZ!DECT Repeater 100"><present>1</present><name>FRITZ!DECT Rep 100</name><temperature><celsius>270</celsius><offset>0</offset></temperature></device><device identifier="08761 0053251" id="18" functionbitmask="2944" fwversion="03.87" manufacturer="AVM" productname="FRITZ!DECT 200"><present>1</present><name>FRITZ!DECT 200 </name><switch><state>0</state><mode>manuell</mode><lock>0</lock><devicelock>0</devicelock></switch><powermeter><power>0</power><energy>48922</energy></powermeter><temperature><celsius>405</celsius><offset>0</offset></temperature></device></devicelist>
17:55:42.123 [DEBUG] [itz.handler.AVMFritzBaseBridgeHandler] - polling FRITZ!Box avmfritz:fritzbox:192_168_2_10
17:55:42.128 [DEBUG] [nternal.hardware.FritzAhaWebInterface] - GETting URL http://192.168.2.10/webservices/homeautoswitch.lua?switchcmd=getdevicelistinfos&sid=8114ff89323a6ede
17:55:42.273 [DEBUG] [rnal.hardware.FritzAhaContentExchange] - HTTP response 200
17:55:42.281 [DEBUG] [rnal.hardware.FritzAhaContentExchange] - HTTP response 200
17:55:42.288 [DEBUG] [rnal.hardware.FritzAhaContentExchange] - response complete: <devicelist version="1"><device identifier="11657 0057984" id="17" functionbitmask="1280" fwversion="03.86" manufacturer="AVM" productname="FRITZ!DECT Repeater 100"><present>1</present><name>FRITZ!DECT Rep 100</name><temperature><celsius>270</celsius><offset>0</offset></temperature></device><device identifier="08761 0053251" id="18" functionbitmask="2944" fwversion="03.87" manufacturer="AVM" productname="FRITZ!DECT 200"><present>1</present><name>FRITZ!DECT 200 </name><switch><state>0</state><mode>manuell</mode><lock>0</lock><devicelock>0</devicelock></switch><powermeter><power>0</power><energy>48922</energy></powermeter><temperature><celsius>405</celsius><offset>0</offset></temperature></device></devicelist>
17:55:42.310 [DEBUG] [itz.handler.AVMFritzBaseBridgeHandler] - set device model: org.openhab.binding.avmfritz.internal.ahamodel.DeviceModel@839138[org.openhab.binding.avmfritz.internal.ahamodel.DeviceModel@839138[ain=116570057984,bitmask=1280,isDectRepeater=true,isPowermeter=false,isTempSensor=true,isSwitchableOutlet=false,isHeatingThermostat=false,id=17,manufacturer=AVM,productname=FRITZ!DECT Repeater 100,fwversion=03.86,present=1,name=FRITZ!DECT Rep 100,<null>,<null>,<null>],org.openhab.binding.avmfritz.internal.ahamodel.TemperatureModel@3a8b1c[celsius=27.0,offset=0.0]]
17:55:42.319 [DEBUG] [itz.handler.AVMFritzBaseBridgeHandler] - update thing avmfritz:FRITZ_DECT_Repeater_100:192_168_2_10:116570057984 with device model: org.openhab.binding.avmfritz.internal.ahamodel.DeviceModel@839138[org.openhab.binding.avmfritz.internal.ahamodel.DeviceModel@839138[ain=116570057984,bitmask=1280,isDectRepeater=true,isPowermeter=false,isTempSensor=true,isSwitchableOutlet=false,isHeatingThermostat=false,id=17,manufacturer=AVM,productname=FRITZ!DECT Repeater 100,fwversion=03.86,present=1,name=FRITZ!DECT Rep 100,<null>,<null>,<null>],org.openhab.binding.avmfritz.internal.ahamodel.TemperatureModel@3a8b1c[celsius=27.0,offset=0.0]]
17:55:42.330 [DEBUG] [itz.handler.AVMFritzBaseBridgeHandler] - no thing UID found for device model: org.openhab.binding.avmfritz.internal.ahamodel.DeviceModel@839138[org.openhab.binding.avmfritz.internal.ahamodel.DeviceModel@839138[ain=116570057984,bitmask=1280,isDectRepeater=true,isPowermeter=false,isTempSensor=true,isSwitchableOutlet=false,isHeatingThermostat=false,id=17,manufacturer=AVM,productname=FRITZ!DECT Repeater 100,fwversion=03.86,present=1,name=FRITZ!DECT Rep 100,<null>,<null>,<null>],org.openhab.binding.avmfritz.internal.ahamodel.TemperatureModel@3a8b1c[celsius=27.0,offset=0.0]]
17:55:42.340 [DEBUG] [itz.handler.AVMFritzBaseBridgeHandler] - set device model: org.openhab.binding.avmfritz.internal.ahamodel.DeviceModel@1dc7e69[org.openhab.binding.avmfritz.internal.ahamodel.DeviceModel@1dc7e69[ain=087610053251,bitmask=2944,isDectRepeater=false,isPowermeter=true,isTempSensor=true,isSwitchableOutlet=true,isHeatingThermostat=false,id=18,manufacturer=AVM,productname=FRITZ!DECT 200,fwversion=03.87,present=1,name=FRITZ!DECT 200 ,org.openhab.binding.avmfritz.internal.ahamodel.SwitchModel@1c180be[state=0,mode=MANUAL,lock=0,devicelock=0],org.openhab.binding.avmfritz.internal.ahamodel.PowerMeterModel@1a5c26f[power=0.000,energy=48922],<null>],org.openhab.binding.avmfritz.internal.ahamodel.TemperatureModel@19fdf6c[celsius=40.5,offset=0.0]]
17:55:42.349 [DEBUG] [itz.handler.AVMFritzBaseBridgeHandler] - update thing avmfritz:FRITZ_DECT_200:192_168_2_10:087610053251 with device model: org.openhab.binding.avmfritz.internal.ahamodel.DeviceModel@1dc7e69[org.openhab.binding.avmfritz.internal.ahamodel.DeviceModel@1dc7e69[ain=087610053251,bitmask=2944,isDectRepeater=false,isPowermeter=true,isTempSensor=true,isSwitchableOutlet=true,isHeatingThermostat=false,id=18,manufacturer=AVM,productname=FRITZ!DECT 200,fwversion=03.87,present=1,name=FRITZ!DECT 200 ,org.openhab.binding.avmfritz.internal.ahamodel.SwitchModel@1c180be[state=0,mode=MANUAL,lock=0,devicelock=0],org.openhab.binding.avmfritz.internal.ahamodel.PowerMeterModel@1a5c26f[power=0.000,energy=48922],<null>],org.openhab.binding.avmfritz.internal.ahamodel.TemperatureModel@19fdf6c[celsius=40.5,offset=0.0]]
17:55:42.370 [DEBUG] [itz.handler.AVMFritzBaseBridgeHandler] - no thing UID found for device model: org.openhab.binding.avmfritz.internal.ahamodel.DeviceModel@1dc7e69[org.openhab.binding.avmfritz.internal.ahamodel.DeviceModel@1dc7e69[ain=087610053251,bitmask=2944,isDectRepeater=false,isPowermeter=true,isTempSensor=true,isSwitchableOutlet=true,isHeatingThermostat=false,id=18,manufacturer=AVM,productname=FRITZ!DECT 200,fwversion=03.87,present=1,name=FRITZ!DECT 200 ,org.openhab.binding.avmfritz.internal.ahamodel.SwitchModel@1c180be[state=0,mode=MANUAL,lock=0,devicelock=0],org.openhab.binding.avmfritz.internal.ahamodel.PowerMeterModel@1a5c26f[power=0.000,energy=48922],<null>],org.openhab.binding.avmfritz.internal.ahamodel.TemperatureModel@19fdf6c[celsius=40.5,offset=0.0]]
This shows the initialization and some activities right after.
In the PaperUI it is still shown as uninitialized.