function getZones(entities = {}) {
    return ( 
        Object.values(entities)
        .map(entity => {
            return entity.config.zone;
        }).filter((zone, i, self) => {
            return self.indexOf(zone) == i;
        })
    )
}

function getEntitiesByZone(entities = {}, zone = "") {
    return (
        Object.fromEntries(
            Object.entries(entities)
            .filter(([key, value]) => {
                return value.config.zone == zone;
            })
        )
    )
}