I use a python script that runs automatically on a daily basis as a cron job. It uses the smtplib library to send an email to myself and other stakeholders, and it grabs the data with ODK Briefcase in command line, although I’m sure it would be possible to integrate with REST services.
Here is the source of a version of the script that runs from within stata: http://robinaudy.com/odkgrabber/. I’m sure it can be adapted to work without stata.
I hope this helps!
