On further investigation, does Capture Mobile maybe require the "Local Network" permission? Right now, Capture Mobile doesn't even show up in Settings > Privacy & Security > Local Network on iOS.

According to Apple's developer documentation the following operations do explicitly require those permissions:

• Receiving an incoming UDP multicast
• Receiving an incoming UDP broadcast

Source: https://developer.apple.c...ocal-network-privacy

This might be the root cause.

Capture Mobile should have a setting for local network access. There should also be settings for Capture Mobile, accessible from the Settings app, under the Apps section. There are a few sACN specific options that may be relevant if you are not using the first 16 sACN universes.

I'm not sure that comparing with a Mac says a lot at all. It's a different operating system and your router / WiFi access point may also understand that it's a different type of device and apply other rules.

If possible I would suggest you try Art-Net instead. It is generally much easier to get UDP unicast and broadcast traffic through networks.

Art-Net doesn't work either. I genuinely believe there are missing entitlements (Local Network). Capture Mobile is not even asking for these permissions and hence iOS won't allow for it to receive UDP multicast.

Capture Mobile does have this entitlement. I just double checked and had no problems receiving Art-Net.

This is far more likely to be a networking environment problem than anything else. I would recommend that you restart your devices, including all your networking equipment. I have seen routers and switches fail to keep track of multicast membership too many times. That wouldn't explain why you are unable to get Art-Net through, but some routers, WiFi-routers in particular, do block broadcast traffic.

On top of this - receiving sACN or Art-Net over WiFi is often problematic anyway. I would strongly recommend that you use an ethernet adapter and go cabled. Most WiFi access points will bundle up messages and send them in bursts, resulting in a 5 fps experience.

Lars, first let me thank you for taking the time to look into this.

As to the entitlement: On iOS 26.1 Capture Mobile does not have the Local Network entitlement and the app does not even request it.

A quick check at Settings > Privacy & Security > Local Network shows all apps, that have been entitled. And while other UDP/multicast apps - e.g. NDI Monitor, Plex and others - are listed, Capture Mobile is notable absent.

Also: When installing the app, I never got asked to allow Local Network access. This hints at the app not explicitly requesting this specific permission. Otherwise the operating system would step in and ask the user for consent.

I highly recommend, you guys check on your end, whether anything might be broken with this permission flow: https://support.apple.com/en-us/102229

Besides this, I have an Art-Net related question: Is Capture Mobile supposed to listen for sACN and Art-Net in parallel? Or does it just use the connectivity I've configured for a project with Capture Desktop?

We are definitely linking this entitlement when building, it is there. There will be another reason for it not appearing in the UI. I suspect the reason is that we don't set a NSLocalNetworkUsageDescription. We'll look into that.

I did an interesting test - I completely uninstalled the app and then reinstalled it. At that point the Local Network option in the settings disappeared. So what I think has happened is that if you have had the question answered in a previous version of iOS then the option remains available. But if you completely reinstall the app it disappears. I'm guessing something changed in iOS 26.

However, even with the option gone, I had no issues sending Art-Net to the app. We will do further tests with this week, using sACN as well.