The Telnet Visio demo fails to resolve its file functions on an Eckelmann ExC66H00 because the network library includes a file_server block and therefore retains a dependency on syslibfile.lib. The Telnet functionality itself requires Ethernet support, not a filesystem. Remove the unused file-server dependency when the application does not need filesystem services.
Identify the Library Mismatch
The demo requests SysFileOpen and SysReadFile, while ELC66.lib exposes only sysFileOpen. Do not assume that the differently capitalized open function replaces both requested functions: the available evidence does not establish compatible signatures or provide an equivalent read function.
| Item | Evidence-supported status | Engineering decision |
|---|---|---|
| Telnet Visio demo | Requires Ethernet support | Retain its network functionality |
file_server |
Included in the network library by default | Disable it if filesystem service is unnecessary |
syslibfile.lib |
Required by file_server
|
Remove its reference after neutralizing the block |
ELC66.lib |
Provides sysFileOpen only |
Do not rewrite calls without verified interfaces |
Remove the Unused Filesystem Dependency
- Open the network library as a project.
- Locate the
file_serverblock. - Delete all implementation code from that block, but retain its variable declarations.
- Remove the library reference to
syslibfile.lib. - Rebuild the library and then rebuild the Telnet application.
Keeping the declarations preserves the block interface while removing the code that calls unavailable filesystem functions. This workaround applies only when the project does not require the file-server feature.
When Not to Apply the Workaround
Do not remove the dependency if the application must provide filesystem or file-server functions. In that case, obtain or implement compatible open and read operations using verified Eckelmann interfaces. The evidence does not provide function signatures, return codes, handle types, or buffer semantics, so a safe wrapper cannot be specified from the available information.
Verify the Modified Project
Confirm that the rebuilt library no longer reports unresolved references to SysFileOpen, SysReadFile, or syslibfile.lib. Then verify that the Telnet portion compiles and operates over Ethernet. A successful build alone does not validate any filesystem feature because the workaround intentionally removes the file_server implementation.
FAQ
Why does the Eckelmann Telnet demo request SysFileOpen?
The network library includes a file_server block by default, and that block depends on syslibfile.lib. The Telnet functionality itself does not require a filesystem.
Can sysFileOpen replace SysFileOpen and SysReadFile?
The evidence confirms only that ELC66.lib provides sysFileOpen. It does not establish signature compatibility or identify a replacement for SysReadFile, so verify the interfaces before creating a wrapper.
How do I remove syslibfile.lib from the Telnet project?
Open the network library as a project, clear the implementation code in file_server while retaining its declarations, and then remove the syslibfile.lib reference. Rebuild and confirm that the unresolved file-function references are gone.