A few weeks ago at ONF Connect, the Stratum community announced that the project is now open source.
Here are some of the talks from the event that focused on Stratum:
To help you get started, we have two basic tutorials that walk through how to start Stratum in Mininet as well as how to connect it to ONOS and run Trellis: https://github.com/stratum/tutorial
To learn more about Stratum's northbound interfaces (P4Runtime, gNMI and gNOI), you can try out the NG-SDN tutorial: https://github.com/opennetworkinglab/ngsdn-tutorial
If you are interested in looking into the source code, Stratum is now public: https://github.com/stratum/stratum
Stratum uses Github for source management, issue tracking and pull requests, so file bugs, request features, and submit patches on Github.
The Stratum Technical Steering Team holds a weekly meeting that oscillates between Wednesday at 4:30pm and Thursday at 10:00am Pacific time. You can add the Stratum calendar to see upcoming meetings and events: web view, ICS format (for Outlook, iCal, Google Calendar, etc.).