UWP created with Unity not sending Azure SignalR message to clients in Hololens2

JoeS-3935 21

I created a Universal windows project with Unity that is deployed on a Hololens2. The Unity app is suppose to send and receive messages using Azure SignalR. When testing out the app in the Unity tool platform the project is able to send and receive messages, however when deployed to the hololens2 the app is only able to receive the Azure SignalR messages but not send them. Has anyone had an issue like this before ??

Zuocheng Wang - MSFT 3,091 Reputation points Microsoft Vendor

2023-02-24T09:46:57.5133333+00:00

Hello, Welcome to Microsoft Q&A,

Is there any error message returned when sending failed?

For Unity projects on HoloLens 2, you can find log files at Device Portal->System->File explorer->LocalAppData->[ProjectName]->TempState.
ajkuma 26,136 Reputation points Microsoft Employee

2023-02-27T18:59:44.6633333+00:00

@JoeS-3935 ,

Just checking in to see if you had got a chance to see the previous responses. Kindly share more details to help you better.
JoeS-3935 21 Reputation points

2023-02-27T21:13:25.7733333+00:00

@Zuocheng Wang - MSFT Yes, I have checked out the Unity logs from the portal in the local app data. I looked through the logs, but I could not find anything that stood out for an error when trying to send the message. I was also not 100% sure what what that error would like like though other then debug logs I put in the script. If you know of what I should be looking for in the logs ? It's weird that it works on Unity but once deployed to hololens2 I can only receive but not send messages.
JoeS-3935 21 Reputation points

2023-03-02T09:38:00.98+00:00

I did check out the capabilities in the publishing settings and I have the proper client and server options checked off for deployment. I have not done a live trace before, but I will give that a shot. But I feel like there is something else going on. To test out a theory I made another UWP project without using Unity just a regular 2D project to see if I could send azure signalR messages from it after deployment to the hololens. Initially it was not able to but then after changing the package version of signalR it was able to send messages from the hololens. I was wondering if this could be applied to the Unity project. Or if there is something Unity is doing with the dlls that is causing the issue when it is deployed to the hololens.
ajkuma 26,136 Reputation points Microsoft Employee

2023-03-06T11:58:08.8733333+00:00

Thanks for the follow-up. Apologies for the delay!

As we understand, since straight UWP project without Unity is working as expected. Could you please share more details about your Unity/version? At least for HoloLens 2, it is recommended for Unity 2020 LTS or Unity 2021 LTS version.

//@Zuocheng Wang - MSFT
JoeS-3935 21 Reputation points

2023-03-06T19:18:40.5433333+00:00

No worries about the delay, I appreciate the help. It has been difficult getting help and more information on this issue. The Unity version currently being used on the project is 2020 LTS. I do have the 2021 version installed but I have not switched over to that version because I was worried about adding more issues to my problem since it feels Unity and Hololens is unstable.
ajkuma 26,136 Reputation points Microsoft Employee

2023-03-07T18:49:18.4933333+00:00

Thanks for the follow-up and update. I'm checking on this internally, and will get back to you shortly.

Accepted answer

Zuocheng Wang - MSFT 3,091 Reputation points Microsoft Vendor

2023-03-10T08:48:40.84+00:00

Hello, Welcome to Microsoft Q&A,

Please note that a HoloLens app built by Unity is also a UWP app. And since the straight UWP app deployed on HoloLens 2 can work, the problem seems more likely to be on Unity side. If you want to get support from Unity, you can access Unity Forum.

If you want to review further on HoloLens side, you can open a ticket via aka.ms/HLSupport.

If the response is helpful, please click "Accept Answer" and upvote it.

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ajkuma 26,136 Reputation points Microsoft Employee

2023-03-13T18:50:32.7366667+00:00

I understand you have already checked Unity logs, from Azure SignalR service standpoint, to isolate the issue further:

Azure SignalR service provides live trace tool to expose service traces on connectivity and messaging categories. The traces include but aren't limited to connection connected/disconnected events and message received/left events. With live trace tool, you can capture, view, sort, filter and export live traces.

How to troubleshoot connectivity and message delivery issues

The resource logs provide detailed information for every connection. For example, basic information (user ID, connection ID, and transport type, and so on) and event information (connect, disconnect and abort event, and so on) of the connection. resource logs can be used for issue identification, connection tracking and analysis.

Setup and review resource logs: Set up resource logs for an Azure SignalR Service
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ajkuma 26,136 Reputation points Microsoft Employee

2023-03-13T18:51:04.7066667+00:00

Additionally, since it's a UWP project, it is recommend, to ensure that InternetClient is included in the Capabilities list of your project. You can find the Capabilities list through the following path:

Unity: Edit->Project Settings->Player->UWP settings->Publishing Settings->Capabilities.

sln: Package.appxmanifest->Capabilities.
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UWP created with Unity not sending Azure SignalR message to clients in Hololens2

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