This repo contains the custom package_*_index.json
files that can be used to add new
third party boards to the Arduino v1.6.4+ IDE.
To add MySensors to Boards Manager list, go to IDE preferences, and at the bottom of the dialog add the following URL into "Additional boards managers URLs:" field and hit OK:
https://raw.githubusercontent.com/mysensors/ArduinoBoards/master/package_mysensors.org_index.json
https://github.com/arduino/Arduino/wiki/Unofficial-list-of-3rd-party-boards-support-urls