iot-test-app/utils/index.js

export function convertArray(arr) {
	let convertedArr = [];
	arr.forEach(item => {
		let findIndex = convertedArr.findIndex(i => i.gatewayDeviceId === item.gatewayDeviceId);

		if (findIndex === -1) {
			convertedArr.push({
				gatewayDeviceId: item.gatewayDeviceId,
				children: [item]
			});
		} else {
			convertedArr[findIndex].children.push(item);
		}
	});

	return convertedArr;
}