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TCP connection with hololens works only in one way

Discussion in 'VR' started by Antah, Oct 21, 2017.

  1. Antah

    Antah

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    Oct 21, 2017
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    For a while now I'm trying to send data to hololens but nothing works.

    I'm using Windows.Networking and I have an UWP application running on my PC.
    I based it on this example:
    https://docs.microsoft.com/en-us/windows/uwp/networking/sockets

    When I try to communicate between two PCs or when I'm sending a message from hololens it gets recieved normally but any attempt to send it to the hololens was unsuccessful.

    I have also tried UDP example from this post with the same results - I can recieve a message from hololens but I can't send it:
    https://forums.hololens.com/discussion/7980/udp-communication-solved#latest

    I have tried using different ports and disabling firewall. Tried updating and resetting hololens. Updating Visual Studio, Unity and HoloToolkit. I tried creating a new project with only networking script to check if something other in my project wasn't interfering.

    So if anyone had a similar could you please share what has or hasn't worked for you?
     
    Antah, Oct 21, 2017
    #1
    JS_Richard likes this.

  2. Tautvydas-Zilys

    Tautvydas-Zilys

    Unity Technologies

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    Did you enable the server capability in the manifest?
     
    Tautvydas-Zilys, Oct 23, 2017
    #2

  3. Antah

    Antah

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    Yes, tried all combinations of enabling nothing, private network, internet client/server, all of them.
     
    Antah, Oct 28, 2017
    #3

  4. Tautvydas-Zilys

    Tautvydas-Zilys

    Unity Technologies

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    Are you sure you're sending the message to the correct IP address? Is it the same that you get when you communicate from HoloLens to PC?

    I am not aware of any known issues in such communication, and since you're using Windows APIs directly, Unity doesn't it at all.
     
    Tautvydas-Zilys, Oct 30, 2017
    #4

  5. Antah

    Antah

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    Oct 21, 2017
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    I am sure, I use the same IP for deploying and debugging or accessing web client. I can also add that i used different ports also.
     
    Antah, Oct 31, 2017
    #5

  6. JW_123

    JW_123

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    Jul 11, 2018
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    I'm facing the same problem: sending from HoloLens to server is possible but receiving from server isn't because Accept() does not get any connection. Could you find a solution for your problem in the meantime?


    Update: releasing the port in windows defender firewall solved the problem.
     
    Last edited: Jul 29, 2018
    JW_123, Jul 11, 2018
    #6
    JS_Richard likes this.

  7. JS_Richard

    JS_Richard

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    I have the same issue. HoloLens simply does not receive any messages, or rather disconnects or crashes. But it can send to other devices if it is the client. I tried TCP and Bluetooth, TCP seems to work better.
     
    JS_Richard, Sep 12, 2018
    #7

  8. unity_tmTrLyCJHohNrw

    unity_tmTrLyCJHohNrw

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    Unity 2018.3.6f1 (64-bit), I enabled the server capability in the manifest, and I still have this error
     
    unity_tmTrLyCJHohNrw, Mar 6, 2019
    #8