Added validation and json  output for mqtt
Validtion pattern
Added json validation
Added support for Application in tenant proxy and api
refactoring
Merge branch 'master' of https://github.com/csipiemonte/yucca-realtime.git
Merge branch 'master' of https://github.com/csipiemonte/yucca-realtime.git
bugfix - Application as source of events
Merge branch 'master' of https://github.com/csipiemonte/yucca-realtime.git