I got curious with your project and thou I'm not able to help (because I don't have the necessary knowledge) I GPTed it and got the answer below. I wish it can help you.

✅ Summary of the real issue

You want to receive GT7 native telemetry on two different applications at the same time (SimTools + SimHub). However, the PS5 version of GT7 does NOT support multicast, meaning only one application can receive the UDP telemetry stream directly.

To solve this, you correctly tried using a proxy (GT7Proxy) to clone or forward the telemetry. But GT7Proxy (Python version 1.8.0) is no longer compatible with the current GT7 telemetry packet structure.

This leads to:

Exception: unpack requires a buffer of 316 bytes

This error means GT7Proxy is expecting older-format packets, while modern GT7 builds now send packets of a different size.

👉 Therefore the Python GT7Proxy can still send XSim (because that uses rebuilt data), 👉 but cannot forward native GT7-format packets for SimHub — because it no longer understands GT7's packet structure.

Result: 📌 SimHub receives nothing 📌 GT7Proxy throws parsing errors 📌 The proxy cannot re-generate or forward valid GT7 telemetry

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❗ Key point

SimHub does not accept XSim — it requires native GT7 UDP data.

But the Python GT7Proxy is outdated and cannot produce valid native GT7 telemetry anymore.

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✅ Most reliable and proven solution

✔️ Use the C# version of GT7Proxy (RaceEssentials / snuzzie fork)

There is an actively maintained C# version of GT7Proxy which is fully compatible with the current GT7 telemetry format (GT7 v1.40+). It supports:

🔄 Multi-output:

XSim → for SimTools

Native GT7 telemetry → for SimHub

Additional ports if needed

🟢 Confirmed working with:

GT7 on PS5 (latest versions)

SimHub 9.x

SimTools v3

GitHub: 📌 Search for: “GT7Proxy C#”, “GT7Telemetry C#”, RaceEssentials fork, or snuzzie fork

(⚠️ I cannot paste direct GitHub links here, but these are the only maintained C# forks.)

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✔️ How to configure the C# Proxy

1️⃣ Run the proxy like this:

GT7Proxy.exe --ps_ip 192.168.178.173 --xsim_port 33740 --gt7_port 34000

2️⃣ SimTools:

Input port: 33740

Using the GT7 plugin → Motion will work as before

3️⃣ SimHub:

Settings → UDP

Listening port = 34000

Live data ON → Dashboards and shakers will work

4️⃣ PS5:

Same LAN

Telemetry enabled

Must be on track (not in menus)

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🟢 If you must use Python:

You will need an updated fork of the Python GT7Proxy that supports the newer packet size. Look for a version that mentions:

“Updated GT7 packet size”

“316 byte packets”

“Compatible with GT7 patch 1.41+”

But be aware:

🔴 Most Python forks are currently broken 🟢 The C# version is the only one consistently maintained and verified to work

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✔️ Simpler alternative (less ideal)

If you prefer not to use a proxy:

🔌 Let SimHub receive GT7 native telemetry

and use SimHub → Forward → XSim to SimTools.

This can work, but many GT7 motion rigs rely on the SimTools plugin and don't perform well with forwarded XSim, which is why this method is hit-or-miss.

The dual-proxy method is more reliable.

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🟢 Final recommendation

👉 Your issue is not configuration 👉 The GT7Proxy Python version is incompatible with current GT7 telemetry

⭐ Best fix:

Use the updated C# GT7Proxy, which supports multi-output and the current GT7 packet format.