validate Configuration Data
open override fun validateConfigurationData(configData: IPluginValidationData): IPluginInitializeValidationResult?
Updates the username, password, hrsTillUpdate and the contact directory into the buffer using the configuration-properties BayVIS_Benutzername&&BayVIS_Passwort. Furthermore, credential validity is checked.
Return
A proper IPluginInitializeValidationResult or null if everything is fine.