The use of applications for smart coffee machines is becoming increasingly popular in several coffee-producing countries, including Vietnam. There are smart coffee machines that come with a companion app that works with both Android and iOS devices, allowing you to control the machine whether you're using an Android phone like the Oppo A5 or an iPhone like the iPhone 11. Some devices are also Bluetooth enabled which is an option available on all smartphones. You can also try connecting the smart coffee machine to a tablet to see if you can control the machine with your iPad or Samsung Galaxy Tab.