Add general invalid message
All minipots should implement these types of messages:
(some would have some extra message types).
These message types corresponds:
connect: An opened connection. No transferred data is needed to generate this message
login: "Valid" login was attempted.
passwordis needed to send in the data
invalid: Any error occured, e.g. invalid encoding, broken format, unexpected data, etc. This should cover overall error
Later, we would add e.g.
invalid_login to distinguish general error and error that occurred during login process.
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