BLE Heart Rate Watch Face

An Android Wear Watchface that displays the current heart rate.

Your Android Wear device connects directly to your Bluetooth LE heart rate belt.
No mobile device is necessary after installation. The app displays heart rate zones in colors blue, green, yellow, orange, red and darkred.

On you mobile phone you can adjust your personal heart rate zones, sync your data with the hekori cloud and view your heart rate readings of your last workout.

Requirements:
Android Wear Device (e.g. LG G Watch R)
Bluetooth LE heart rate monitor (e.g. Polar H7)

This app is known to work with

LG G Watch R (Android 5.0.2)
Polar H7

Setup:
Long press the watch face to display the setup screen.
The user can choose to keep the display in interactive mode.
Interactive mode and connected Bluetooth LE device consumes the battery by approx. 10% per hour.
In ambient mode (displaying Date and Time) the power consumption is about 2% per hour.

Troubleshooting:

Sometimes, the Bluetooth heart rate monitor is not listed:

1) check that no other device has connected to your BLE heart rate monitor, e.g., your mobile phone.
2) make sure that the contact pads of your heart rate belt are wet and tightly pressed to your chest.
3) there seems to be a bug in the Android Bluetooth LE implementation. After too many reconnection attempts, it can happen that the heart rate belt is not listed anymore. If that happens, rebooting the watch helps.