S7CommPlus V4 protocol support

[gijzelaerr]

Summary

Implement S7CommPlus V4 protocol support for the latest Siemens S7-1500 firmware versions.

Background

V4 represents the latest evolution of the S7CommPlus protocol with the most advanced security features. Details on V4 are scarce in public research.

What needs to be done

• Research V4 protocol differences through packet captures and analysis
• Identify new security mechanisms (TLS integration, certificate-based auth, etc.)
• Implement V4-specific session establishment
• Implement V4 PDU encoding/decoding
• Add tests against real PLCs
• Update documentation

Notes

This is the least documented version. May require significant reverse engineering effort or access to specific PLC firmware versions for testing.

Related

• Depends on V3 support being implemented first
• Part of the S7CommPlus protocol family