[MV]Unable to parse ResultDataType for Machinery

[izonfreak]

The gateway crashes if the object contains a variable of the ResultDataType from machinery. The variable is contain in a ResultType variable type also from machinery.

https://reference.opcfoundation.org/Machinery/Result/v100/docs/10.5

While the lack of support of variant arrays (BaseDataType) is expected. The crash when reading/browsing the variable is not. A null value for the result content is expected but the result metadata should be there as it is just structure with already known types.

The expected mqtt result should be something like:

{
"ResultManagement": {
"Results": {
"ResultVar": {
"ResultMetadata": {
"CreationTime": "2023-6-5T8:49:50:822Z",
"ExternalRecipeId": "-ExternalRecipeId",
"HasTransferableDataOnFile": false,
"InternalRecipeId": "-InternalRecipeId",
"IsPartial": false,
"IsSimulated": true,
"JobId": "-JobId",
"PartId": "-PartId",
"ResultId": "5-ResultId-6"
},
"ResultContent": "null"
}
}
}
}

• OPC UA Dashboard Client Version 2.0.0 rc-7
• DashboardOpcUaClient-20230605.log

[Kantiran91]

I think this bug is related to #454 and #361
Maybe also a bug in the open62541 encoding.
@mdornaus Waht do you think?