New app: Heartrate Monitor
Heartrate Monitor is the first F-Droid app created using Gio, an immediate-mode GUI for the Go programming language. Apps in Gio may be written in pure Go, or optionally include Java code to access Android APIs where the NDK or JNI are not adequate.
The metadata file compiles and passes 'fdroid lint'. It uses manual compilation, first downloading and installing Go 1.13, then installing the gogio tool from gioui.org/cmd/gogio, then building required Java jar files to enable the Bluetooth library, and then building the final APK with the gogio tool.