Dataclass MessageInfoType in ocpp201 has different attribute name than in json Schema for NotifyDisplayMessagesRequest

[AlfredoNaef]

Hello,

I am currently using your library to implement OCPP 2.0.1 fro my company. While, testing that my implemnetation of the messages at least are sent, recieved and answered, I noticed that for NotifyDisplayMessagesRequest the Pyaload is not sent. After some digging, I found that if in NotifyDisplayMessagesPayload in the attribute message_info I provide the MessageInfoType and inside this dataclass I also define the attribute end_data_time, then the payload is not sent because it fails the validation with the json schema for NotifyDisplayMessagesRequest. Specifically, in MessageInfoType.end_data_time is a typo and should be MessageInfoType.end_date_time, because in the json schema the field is called endDateTime. In conclusion, to fix this bug you just need to rename the attribute in MessageInfoType from end_data_time to end_date_time (it's just a simple e instead of a).

[Jared-Newell-Mobility]

Thanks, nice catch - a PR has been opened #549

[Jared-Newell-Mobility]

Merged and will be included in the next minor release