S7CommPlus V3 protocol support

[gijzelaerr]

Summary

Implement S7CommPlus V3 protocol support for communicating with Siemens S7-1500 PLCs with newer firmware versions.

Background

S7CommPlus V3 is used by S7-1500 firmware ≥2.0. It adds enhanced security features on top of V2, including stronger encryption and authentication mechanisms.

What needs to be done

• Identify the exact differences between V2 and V3 from packet captures / Wireshark dissectors
• Implement V3-specific session negotiation
• Implement any additional encryption or authentication layers
• Implement V3 PDU encoding/decoding differences
• Add tests against real PLCs or captured traffic
• Update documentation

References

• Wireshark S7CommPlus dissector
• S7CommPlus protocol analysis research

Related

• Depends on V2 support being implemented first
• Part of the S7CommPlus protocol family

[gijzelaerr]

should be implemented in #659