Have any idea about this line in the logs:
The login credentials are wrong or another client connected to your Indego account
This is a correct message. Since my user is locked out with to many false tries. 
Below, you see a correct login, with a new user. When the bosch indego binding is ‘alone’, it works.
But as soon as I installed the http binding, it goes offline.
Correct working:
=> log/events.log <==
2020-03-19 08:55:08.327 [hingStatusInfoChangedEvent] - 'boschindego:indego:82885ae2' changed from OFFLINE to ONLINE
When I install the http-binding as extra (and only) binding:
...
2020-03-19 09:01:45.751 [DEBUG] [org.eclipse.jetty.server.HttpChannel] - REQUEST for //192.168.1.10:8080/rest/extensions/binding-http1/install on HttpChannelOverHttp@76b57edb{r=166,c=false,c=false/false,a=IDLE,uri=//192.168.1.10:8080/rest/extensions/binding-http1/install,age=0}
...
2020-03-19 09:01:46.597 [DEBUG] [ell.impl.action.osgi.CommandExtender] - org.apache.httpcomponents.httpclient (478): Not an extended bundle or destruction of extension already finished
2020-03-19 09:01:46.597 [DEBUG] [org.osgi.framework.BundleEvent ] - BundleEvent STOPPED
2020-03-19 09:01:46.602 [INFO ] [internal.service.FeaturesServiceImpl] - org.openhab.binding.boschindego/2.5.2
2020-03-19 09:01:46.602 [DEBUG] [ell.impl.action.osgi.CommandExtender] - org.openhab.binding.boschindego (448): Starting destruction process
2020-03-19 09:01:46.602 [DEBUG] [ell.impl.action.osgi.CommandExtender] - org.openhab.binding.boschindego (448): Not an extended bundle or destruction of extension already finished
2020-03-19 09:01:46.603 [DEBUG] [ell.impl.action.osgi.CommandExtender] - org.openhab.binding.boschindego (448): Starting destruction process
2020-03-19 09:01:46.603 [DEBUG] [ell.impl.action.osgi.CommandExtender] - org.openhab.binding.boschindego (448): Not an extended bundle or destruction of extension already finished
2020-03-19 09:01:46.603 [DEBUG] [org.osgi.framework.BundleEvent ] - BundleEvent STOPPING
2020-03-19 09:01:46.608 [DEBUG] [org.osgi.framework.ServiceEvent ] - ServiceEvent UNREGISTERING - {org.eclipse.smarthome.core.thing.binding.ThingHandlerFactory}={service.id=381, service.bundleid=448, service.scope=bundle, component.name=org.openhab.binding.boschindego.internal.BoschIndegoHandlerFactory, component.id=227}
2020-03-19 09:01:46.611 [DEBUG] [org.eclipse.jetty.server.HttpChannel] - sendResponse info=null content=DirectByteBuffer@30df624e[p=0,l=185,c=32768,r=185]={<<<event: message\nda...usInfoEvent"}\n\n>>>Detail\\":\\"NONE\\"...gs":[],"groupNa} complete=false committing=false callback=Blocker@58b3d634{null}
...
See complete log for more info: debug.txt (122.0 KB)