I want to use the HDMI ouput of the Pi as a public display screen while being able to access the Pi for other purposes over ssh and Remote Desktop Connection.
I would like to have various static parts of the display show some graphs and logos, but most of the area should be used to show some simple numberic data using a very big font, refreshed every 15 seconds.
The numeric data comes from a process written in C++ which gets some energy data over a neywork and keeps a 15 second rolling 4 average, giving rise to one fixed point number with format %2.1f - If it would be a useful intermediate step, this data could be written to bitmap and then displayed somehow.
Somebody pointed me at Screenly OSE, but is there a simple programatic way to access the entire HDMI screen and prevent any other processes getting at it ? Or for that matter is there any other simple way to show dynamic content using the HDMI output.