iOS Simulator video never arrives from an Intel (x86_64) SSH device host: vendored serve-sim is arm64-only

[juliusmarminge]

Originally filed as issue #17935 by @zek: #17935

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Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/server

Steps to reproduce

1. Add an Intel Mac as an SSH device host (Settings → Integrations → Devices). Host: MacBookPro16,1, Intel Core i9-9980HK, macOS 26.7.1, Xcode 26.5, iOS 26.5 simulator runtime, Node 24 (darwin-x64).
2. Wait for the host to report ready. It installs expo-device-hub@0.15.3 and agent-device@0.21.23.
3. Open an iOS simulator from that host in the Device panel.

Expected behavior

The simulator video streams in the Device panel. If the host's CPU architecture can't stream, the host or device should say so instead.

Actual behavior

The panel shows "No video received from the device". device_list reports the host as ready with iOS available: true. device_open boots the simulator. device_screenshot and agent-device control both work. Only the video stream fails.

Root cause: every native binary in the vendored serve-sim is arm64-only.

$ cd ~/.t3/device/tools/expo-device-hub@0.15.3/node_modules/expo-device-hub/vendor/serve-sim/dist
$ file native/serve-sim-native.node bin/LiveKitWebRTC.framework/LiveKitWebRTC capability-loader/libServeSimCapabilityLoader.dylib simax/serve-sim-ax-settings simcam/libSimCameraInjector.dylib simcam/serve-sim-camera-helper
→ all six: Mach-O 64-bit arm64

$ node -e 'require("./native/serve-sim-native.node")'
dlopen(...serve-sim-native.node): incompatible architecture (have 'arm64', need 'x86_64h' or 'x86_64')

Rosetta can't help here, because it only runs x86_64 code on Apple Silicon and not the reverse.

Suggested fix: ship x86_64 (universal) slices for serve-sim. If Intel streaming isn't supported, report it in the host's platform status, as the Android "SDK missing" reason already does, and document it in docs/user/devices.md.

Impact

Major degradation or frequent failure

Version or commit

0.0.46-nightly.20261010.2935 (desktop app on an Apple Silicon Mac, macOS 27.0)

Environment

Client and server: Apple Silicon Mac. SSH device host: Intel Mac (x86_64), macOS 26.7.1, Xcode 26.5.

[russelllobo]

Need this! Save my old mac