Don't execute rule if previous value was NULL

[rossko57]

Get the previousState / triggeringItem with Blocky (use one script / rule for multiple equipments / points / devices)

A small update: Blockly now contains all kinds of contextual info like triggeringItem, new state, previous state, triggered channel… A lot of stuff was added in the openhab category and even more is available at the marketplace

See “contextual info” by the look of it.

previousState in this usage is not “the previous state of a specific named Item” it is instead “the previousState of whatever triggered this rule”, thats the contextual part.