Improve Exception handling and CallError responses #335
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This PR is to improve the exception handling in validating messages and to make the CallError messages closer to the OCPP spec. Quick overview:
NotSupported
to the exception list.NotImplemented
toNotSupported
when a handler doesn't exist.details
ValidationError
as it is not a valid OCPP error type, doesn't generate a CallError, and crashes the code when handling messages. I've tried to replace them with relevant OCPP error types.