[Packager] Only a single simulator gets LiveReload/HMR connections in Xcode 9

[orta]

Description

Installed the Xcode9-beta simulator, opened up my app in two different devices and hit save.

You can see it happening in this tweet: https://twitter.com/orta/status/872002403930968064

Reproduction Steps and Sample Code

List all the steps required to reproduce the issue you're reporting. These steps should be clear and concise.

• The beta can be downloaded from https://developer.apple.com/xcode
• If you run your app from the Xcode project, you can run it twice by changing the device type in this device switcher

Once you have two simulators running, whichever simulator you hit cmd +r on last is the one that receives notifications about the module changes.

Solution

Ideally React Native Packager would support multiple connections.

Additional Information

• React Native version: 0.45
• Platform: iOS
• Development Operating System: macOS
• Dev tools: Xcode 9

[cpojer]

This file: https://github.com/facebook/react-native/blob/master/local-cli/server/util/attachHMRServer.js needs to be turned into a class per platform.

[linnett]

+1

This problem occurs also when there are multiple physical devices running hot reload. The only one that updated is the last one you enable

[ajostergaard]

https://react-native.canny.io/feature-requests/p/hot-reload-multiple-clients-simultaneously

[ajostergaard]

I have what appears to be the same problem when running Android and iOS simulators simultaneously - the last one reloaded gets the hot reload. Does that work for others?