Mark devices as not reachable after repeated APS confirm errors (#6387)
Mark devices as not reachable after repeated APS confirm errors (#6387)

The error counter is `16` to not jummp too conclusions too quickly.
Prior to this PR DDF based devices could be stuck in the reachable: true state for a long time
and needless APS requests where made.
dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin,dresden-elektronik/deconz-rest-plugin