Glowing Coal

Glowing Coal connects to an Ember smart mug over Bluetooth Low Energy and keeps a live view of what the mug is doing: status, current and target temperature, and battery with a charging indicator. You can set the target heat and store custom drink presets with timers.

It is built with Expo Router and React Query, with a small native module for scheduling the timers and alarms that the JavaScript layer cannot do on its own.