Unreal engine 5.4 doesn't listen for UDP on 11111 at all (5.3 works fine)

Development Programming & Scripting
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1

I am attempting to establish a LiveLink connection using the latest Unreal Engine 5.4.0 (preview). However, the target list remains empty. I have verified that the iPhone is transmitting the UDP packets using Wireshark. It appears that Unreal Engine 5.4.0 does not set up a listener for LiveLink packets on port 11111 (see the attached screenshot). It was working in the previous version (5.3.2).

5.3.2 settings and UDP endpoints

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image2872×1782 384 KB

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image1058×220 72.9 KB

5.4.0 settings and UDP endpoints

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image2872×1782 384 KB

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image1058×186 53.2 KB

Are there any further steps I can take to fix the issue?

2

I found the issue. This commit changed the default value of bEnableLiveLinkForFaceTracking in BaseEngine.ini. It would be nice if this could be configurable from the Engine UI or at least added to documentation.