I went ahead and officially addressed this by adding the AGPL v3 license to the application. I chose the Affero GPL as the code can be modified to run as a service and this ensures modifications are published.

Thank you for bringing this to my attention.

Changes: https://github.com/OpenSprinkler/OpenSprinkler-App/commit/405998fc90aad0d0763348e42a94876bc8c656e8