An example filter module for educational purposes

If having easy to understand input and output modules was interesting for new developers, an example filter is even more important, since this is the magic behind the scenes on Geyser. A filter plugin can process one or various input plugins in a logic way, and trigger one or more output modules or filter modules as a result.

In a certain way, this could be described as high level logic gates. That means, the example filter module should be simple boolean logic gates. If more than one example filter is developed, they should show various easy to understand logic operations (like "trigger when more than xx% of the input triggers are activated", or "trigger if x different input modules are trigger are activated in less than y hours/minutes/seconds").