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Wrangler (formerly CloudOS) provides functionality to installing rulesets in a pico and they can change overtime just as the programs installed on a computer change over time. As the installed rulesets change, so does the pico's API.
KRL
KRL is the language in which rulesets are programmed. Picos run KRL using the event evaluation cycle. Rules in KRL are "event-condition-action" rules because they tie together an event expression, a condition, and an action. Event expressions are how rules subscribe to specific events on the pico's event bus. KRL supports complex, declarative event expressions. KRL also supports persistent variables, which is how developers access the pico's state. KRL developers do not need a database to store attributes for the pico because of persistent variables.
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