New Blind

Topic is origin, so when 

app opens it is "$pageview"

button pressed it is "" if set then it will always overwrite any incoming msg.topic

Schedule is default "Topic 1" or as configured, but on msg is passing through switch it will be changed to buttons msg.topic. However it includes msg.scheduledEvent: TRUE?FALSE

MYGGBETT subscribe by default Topic is empty, but can be configured.

MYGGBETT read passes through incoming msg.topic

But pass through msg from button has topic reset to "ui"

So if need to follow source then copy to another variable!!

Payload = blind status False when open

?? Scheduler sets msg.topic to Topic 2 but on passing through switch msg.topic is ""

So conclude that msg.topic on switch should be empty then can use msg.topic to identify