SimosMCP
MCP server for Simos 18.1 ECU tuning that reads, writes, diffs, and validates XDF/BIN files.
README
SimosMCP
MCP server for Simos 18.1 ECU tuning — read, write, diff, and validate XDF/BIN files.
What it does
Reads XDF definition files and BIN binary files, letting you:
- List all tables and scalars in an XDF
- Read table data (2D maps) with proper axis labels and scaled values
- Read scalar values (single parameters)
- Write table data back to BIN files
- Write scalar values back to BIN files
- Diff two BIN files to see what changed
- Validate tables against their min/max ranges
- Search for tables by name
Setup
No dependencies beyond Python 3.10+. Uses only standard library (xml.etree.ElementTree, struct).
VS Code MCP config
Add to .vscode/mcp.json:
{
"servers": {
"SimosMCP": {
"type": "stdio",
"command": "python",
"args": ["path/to/simosmcp/server.py"]
}
}
}
Or run directly
cd path/to/simosmcp
python server.py
Tools
| Tool | Description |
|---|---|
list_tables |
List all tables/scalars, filter by category or search |
read_table |
Read a table's data from a BIN (returns x/y axes + 2D data) |
read_scalar |
Read a scalar/constant value |
write_table |
Write a 2D array to a table in a BIN |
write_scalar |
Write a value to a scalar in a BIN |
diff_bins |
Compare two BINs and show differences |
validate_table |
Check a table's values against min/max ranges |
search_tables |
Search for tables/scalars by name |
How it works
The XDF file is an XML definition that tells the parser:
- Where data lives in the BIN (addresses, data sizes)
- How to interpret it (signed/unsigned, endianness)
- How to scale raw values to human-readable units (MATH equations)
The parser handles:
- Embedded axis data (read from BIN)
- Label-based axes (defined in XDF)
- Linked axes (cross-references between tables)
- MATH equation transformation (forward and inverse)
- Both ECU (Simos 18.1) and TCU (DQ250) XDF formats
- Automatic endianness detection from
mmedtypeflags
Tested with
SC8S50_switchpatch29.33_v1.006.xdf(ECU, Simos 18.1)F45M_DSG_v1.007.xdf(TCU, DQ250)
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