Basic OCPP V1.6 support has been included in V4.1.0 with additional features in the current latest version V4.1.1. OpenEVSE OCPP support should currently be regarded as beta.
Feedback on the OCPP feature would be appreciated, here is an example of testing OpenEVSE OCPP with Steve
Big thanks to matt-x for contributing OCPP support. For all the info regarding which OCPP features are supported, see: