The Dart VM Service was not discovered after 60 seconds

[Maxenor]

Describe the bug
When launching my app with flutter run I cannot access debug mode. I get a blank screen and no logs. After 60 secs I get "The Dart VM Service was not discovered after 60 seconds". I have to put --release to get it to work.
I use my Iphone with wired connection.

To Reproduce
Steps to reproduce the behavior:

1. Connect iphone
2. flutter run & select Iphone
3. Open app & nothing happens
4. See error in vscode terminal

Expected behavior
My unity scene launches in debug mode

Screenshots
If applicable, add screenshots to help explain your problem.

Unity (please complete the following information):

• OS: Macos sequoia 15.3.1
• Version 6

Smartphone (please complete the following information):

• Device: Iphone 13
• OS: Ios
• Version 18.3.1

Additional context
No issues with flutter doctor -v. Trying to launch only with xcode does not work as well, i've tried doing flutter attach too. This is not an issue with my iphone since a blank flutter project works in debug mode

[Maxenor]

@timbotimbo any chance I could get some help ?

In the Unity-Iphone I have duplicate symbols issues due to there being 2 "NativeCallProxy.mm" files in the Build Phases -> Compile sources.

The first file is at project/ios/UnityLibrary/Libraries/FlutterUnityIntegration/Plugins/iOS/NativeCallProxy.mm and the second is at project/ios/UnityLibrary/Libraries/Plugins/iOS/NativeCallProxy.mm.

First file

/ .mm file
#import <Foundation/Foundation.h>
#import "NativeCallProxy.h"


@implementation FrameworkLibAPI

id<NativeCallsProtocol> api = NULL;
+(void) registerAPIforNativeCalls:(id<NativeCallsProtocol>) aApi
{
    api = aApi;
}

@end


extern "C" {
    void showHostMainWindow() { return [api showHostMainWindow]; }
    void unloadPlayer() { return [api unloadPlayer]; }
    void quitPlayer() { return [api quitPlayer]; }
}

// .h file

// [!] important set UnityFramework in Target Membership for this file
// [!]           and set Public header visibility

#import <Foundation/Foundation.h>

// NativeCallsProtocol defines protocol with methods you want to be called from managed
@protocol NativeCallsProtocol
@required
- (void) showHostMainWindow;
- (void) unloadPlayer;
- (void) quitPlayer;
// other methods
@end

__attribute__ ((visibility("default")))
@interface FrameworkLibAPI : NSObject
// call it any time after UnityFrameworkLoad to set object implementing NativeCallsProtocol methods
+(void) registerAPIforNativeCalls:(id<NativeCallsProtocol>) aApi;

@end

Second file

mm file

#import <Foundation/Foundation.h>
#import "NativeCallProxy.h"

@implementation FrameworkLibAPI

id<NativeCallsProtocol> api = NULL;
+(void) registerAPIforNativeCalls:(id<NativeCallsProtocol>) aApi
{
    api = aApi;
}

@end

extern "C"
{
    void sendMessageToMobileApp(const char* message)
    {
        return [api sendMessageToMobileApp:[NSString stringWithUTF8String:message]];
    }
}

.h file

#import <Foundation/Foundation.h>

@protocol NativeCallsProtocol
@required

- (void) sendMessageToMobileApp:(NSString*)message;

@end

__attribute__ ((visibility("default")))
@interface FrameworkLibAPI : NSObject

+(void) registerAPIforNativeCalls:(id<NativeCallsProtocol>) aApi;

@end

I've tried merging the 2 files and removing one from the compile sources, but I get the white screen with the same error about the dart vm service as the app launches on my phone