createState('test_iob', 2700);
createState('test_homekit', 140);

var hkmin = 140;
var hkmax = 500;
var iobmin = 2700;
var iobmax = 6500;

var p;

on({id: 'test_iob', change: 'ne', ack: false}, function (obj) {
    if(obj.state.val >= iobmin && obj.state.val <= iobmax){
        p = parseInt(((obj.state.val-iobmin) / (iobmax-iobmin)) * (hkmax-hkmin) + hkmin, 10);
        setState('test_homekit', p, true);
    }
});

on({id: 'test_homekit', change: 'ne', ack: false}, function (obj) {
    if(obj.state.val >= hkmin && obj.state.val <= hkmax){
        p = parseInt(((obj.state.val-hkmin) / (hkmax-hkmin)) * (iobmax-iobmin) + iobmin, 10);
        setState('test_iob', p, true);
    }
});