kraken: 24x7 heart rate tracking

**IMPORTANT** The battery lifetime of this app on the forerunner 235 watch is currently about 1 day. This is due to high frequency sensor readings which is described later in more detail. version: 0.2.0 Updated session storing, now we only create one session when we start kraken and terminate the session when we stop the app. version: 0.1.0 **kraken** is an open source garmin app for the forerunner 235. https://github.com/dkappler/kraken It was created to show and store more detailed 24x7 heart rate data. The main idea is to query the sensor only ones every so and so many seconds (user choice)and visualize the last ~90 minutes of heart rate data always on screen. To be battery efficient the screen is only updated every minute. The sensor is queried always for 15 seconds every minute e.g. 1.22 - 1.43 or 10.22-10.43. The heart rate which is visualized is the mean heart rate obtained from this measurement period. IMPORTANT: The sensor is queried every second right now, due to a bug in the Garmin SDK. Therefore, the battery lifetime is a little bit more than a DAY. As soon as this is fixed, the battery lifetime should increase significantly. ## Todos Right now all parameters are hard coded and not accessible by the watch keys. This has to be changed. The current SDK supports turning of the sensor, but according to forum.garmin.com there is a bug in the implementation which is why the sensor is taking measurements every second and cannot be turned off ones activated. As soon as Garmin will fix this issue the battery lifetime should significantly increase when using this app. ## Donation If you like this app donations are always welcome. Please visit the github page: https://github.com/dkappler/kraken ## Contributions This is an open source project, feel free to contribute to the project on https://github.com/dkappler/kraken.