loadProperties(props) {
		// Rewrite property names to device internal ones
		props = props.map(key => this._reversePropertyDefinitions[key] || key);

		// Call get_prop to map everything
		return this.call('get_prop', props)
			.then(result => {
				const obj = {};
				for(let i=0; i<result.length; i++) {
					this._pushProperty(obj, props[i], result[i]);
				}
				return obj;
			});
	}
Load properties from the device.

@param {*} props