I'm trying to add new connector. I've already created new project (called MyConnector) and class within it (called Connector) which inherit BaseIntegrationConnector, override Init method, set ConnectionName to GetType().Name and build solution.
In Integration bus/new connector I've set the fields as follows:
Display name - MyConnector,
Code name - MyConnector,
Assembly name - MyConnector,
Class - MyConnector,
After save the Assembly name change to "(custom classes)" and after change this value the Class text box reset to zero.