There are some Heavy duty Wireless Industrial Relay Controller board https://store.ncd.io/product/legacy-universal-2-channel-dpdt-relay-controller/ which use private network to control remotely but to check the status ok relay controller board timely and create the push notification by interfacing wireless through Raspberry Pi , we need to send the Notification on smartphone by using some secure cellular communication, and leads to make this kind of work useful will be very helpful.