Connection timeout with react native

[thitemple]

Description

I'm trying to use this with React Native and it's failing with connection timeout.

"TimeoutError: Event response for 'login' timed out
    at SCSocket._handleEventAckTimeout (blob:http://localhost:8081/26f10f58-4ab3-4aa1-8116-d08fdb9bae27:84260:19)
    at blob:http://localhost:8081/26f10f58-4ab3-4aa1-8116-d08fdb9bae27:84286:12
    at blob:http://localhost:8081/26f10f58-4ab3-4aa1-8116-d08fdb9bae27:23291:21
    at _callTimer (blob:http://localhost:8081/26f10f58-4ab3-4aa1-8116-d08fdb9bae27:23208:9)
    at Object.callTimers (blob:http://localhost:8081/26f10f58-4ab3-4aa1-8116-d08fdb9bae27:23415:9)
    at MessageQueue.__callFunction (blob:http://localhost:8081/26f10f58-4ab3-4aa1-8116-d08fdb9bae27:10183:44)
    at blob:http://localhost:8081/26f10f58-4ab3-4aa1-8116-d08fdb9bae27:9953:17
    at MessageQueue.__guardSafe (blob:http://localhost:8081/26f10f58-4ab3-4aa1-8116-d08fdb9bae27:10145:11)
    at MessageQueue.callFunctionReturnFlushedQueue (blob:http://localhost:8081/26f10f58-4ab3-4aa1-8116-d08fdb9bae27:9952:14)
    at http://localhost:8081/debugger-ui/debuggerWorker.js:72:58"

Repro code

Here's what I'm using to set it up:

Program.mkProgram App.init App.update App.view
|> Program.withSubscription subscribe
#if RELEASE
#else
|> Program.withDebuggerAt (Debugger.Remote("localhost", 8081))
|> Program.withConsoleTrace
|> Program.withHMR
#endif
|> Program.withReactNative "demoApp"
|> Program.run

Expected and actual results

Please provide the expected and actual results.

Related information

• elmish version: 1.0.3
• fable-compiler version: 1.3.17
• fable-core version: 1.3.17
• Operating system: Windows 10

[MangelMaxime]

Hum... You are using react-native so the code is running on your mobile device/emulator.

IMHO localhost refer to the device and not your computer.

[thitemple]

I tried replacing localhost with my local IP and that didn't fix it.

[et1975]

• Are you running emulator (which one?) or is it Windows RN? iOS needs certain permissions, I haven't tried running Windows RN with debugger, it may need network access permissions as well. Android emulator needs port forwarding. See the server instructions bellow.

• Are you running a local server?

• Do you have a monitor/UI up and running (options are listed on the server README)?

[thitemple]

I'm running on my actual device (Android) connected via USB
I'm not running local server, or at least I don't think I am. I'm implementing my tests on top of the Nightwatch repo

[et1975]

I'm not running local server

The debugger client elmish runs needs to connect to something that will index and store the state. In case of SPA (React) it is as easy as installing the browser plugin, in case of Native, we need to talk over the network to a server. That server will keep the history and actions, but has no UI. For the UI you need a "monitor" that would connect to the same server and let you browse the data and go back and forth in history.