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machine.js

const machine = Machine({
  id: 'sensor',
  initial: 'inactive',
  states: {
    inactive: {
      on: {
        HW_HIGH: 'active'
      }
    },
    active: {
      on: {
        HW_LOW: 'inactive'
      },
      entry: ['activateHw'],
      exit: ['deactivateHw'],
    }
  },
});