Due to the data loss of the forum, I post my current status:
The new jar solves my issue (poweroff/on), it takes about 30 sec till the device is online again - measured from power plug in till it plays music
These short “one second” absents happen one or two times a day.
My setup:
org.jupnp:retryAfterSeconds=10
org.jupnp:asyncThreadPoolSize=60
org.jupnp:threadPoolSize=30
org.jupnp:remoteThreadPoolSize=60
org.jupnp:asyncThreadPool=false
org.jupnp:mainThreadPool=false
org.jupnp:remoteThreadPool=true