File Transfer Rework

Description

Rework FileTransfer (currently in samples) to make it a generic S2OPC server module.

Code version identification

0c251792

Current behavior

issue #2 on internal repo.

Expected behavior

The main change is to replace the file's internal storage mode (during all processes): File (before) -> Byte string (after enhancement)

Security impact

• Beware of overflowing file size?

Implementation

• Internal storage : ByteString
• User Cb: on open and close methods (offers the user the possibility of downloading/saving content in a hard file on their own.

Limitations :

• Allows only one simultaneous opening per file.
• A file handle remains valid on close session (standard OPC UA deviation).
• UserWritable variable are not supported (initialize to true at the first open method call, when Writable variable is not defined)

To-Do:

• Rebase toolkit_demo_file_transfer on new implementation
• Write tests
• change the adddress space of toolkit_demo_file_transfer_new. rename it toolkit_demo_server_file_transfer (generate a dedicated AS)
• Move to thread safe Dictionary when available : #1574