PhotoViewer - it's an application, which get random image of nature from unsplash.com and send it over bluetooth. It can be applied to digital photo viewer, which able update image over bluetooth.
Run the application without parameters, and use console menu for inract. You can set custom update period and choose bluetooth device. All parameters will saved in windows registry. After first configuration you can run app with -r parameter and enjoy. It help's you to run app from scheduler. Downloaded image store in TEMP folder, defined as a environment variable.
This version work's only on Windows OS and only with default windows bluetooth stack. It specified in library witch implemets work with bluetooth.