Add RTC check

Signed-off-by: Michael Buesch <m@bues.ch>
Add message for global state

Signed-off-by: Michael Buesch <m@bues.ch>
Reduce watchdog timeout for main loop

Signed-off-by: Michael Buesch <m@bues.ch>
gui: Show global state

Signed-off-by: Michael Buesch <m@bues.ch>