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The action coming from the push-button has a priority equal to 2. Previously to push-button, there was another action that had a priority equal also to 2. The priorities are equal, so push-button action can be done.
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[{"id":"82f23d3.6d714c","type":"vertex action","z":"48c64e7.cdb30b","name":"","typeButton":"toggle","bPayload":{"ON":{"action":"maxlevel","group":"de782b48a32127ca0261e36a119e8ebf","param":null,"priority":"2"},"OFF":{"action":"minlevel","group":"de782b48a32127ca0261e36a119e8ebf","param":null,"priority":"2"}},"bState":false,"defaultpriority":false,"x":490,"y":100,"wires":[["3f884023.a9f3e"]]}] |
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if, for example, the priority value is changed to 1 in one of the actions, it will not be possible to change the status of our luminaire with lower priority value.
Another example
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In this case saved push-button priority is 1 and sensor priority is 0. It means that push-buttons action nodes will always execute at first order.