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    Connects in Notify mode, but no data sent

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    • M
      Monolit
      last edited by

      Trying to use a device with BLE 5.0 operating in notification mode.
      GUI-O app reports proper connection but no response from the device.
      Debugging the device software shows that no data (@INIT) seem to come from GUI-O.
      I am really stuck here as I have no Idea of what GUI-O do to verify proper transmission?
      I suppose that "connected" mean that all BLE-negotiations were settled ok?
      I also suppose that "Connected device not responding" mean that GUI-O have sent @INIT
      without problem and now is expecting at least some setup data coming back. Right?

      Any hint how I can further characterize the problem?
      /Monolit

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      • K
        kl3m3n
        last edited by kl3m3n

        Hello!

        Yes, you are correct - if the underlying descriptor supports notifications, the connection should be successful (a notification "Notifications for characteristic enabled" should be displayed and GUI-O should show "Connected" status).

        Yes, "Connected device not responding" means that GUI-O application received no data (which was expected in a certain time interval after pressing the initialization button).

        Firstly, you can try enabling local logging under the Developer mode menu. Navigate to Info menu and press Application version 10 times. A new menu entry should appear at the bottom (Developer mode). Please enable log incoming and log outgoing messages.

        Retry your setup and exit the GUI-O app. Use a file manager to navigate to Android/data/com.guio.guioapp/files and check in_messages and out_messages logs. Is there any data there?
        Note that for Android 11 you will probably need a PC to access this directory (due to Android restrictions).

        Next, you could also try ignoring the initialize button and send the data from your device to the GUI-O application after successful connection (you don't need to trigger the @init command, GUI-O can still receive data).

        I will try to check with my Bluetooth LE module tomorrow and will report back.

        Best regards

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        • K
          kl3m3n
          last edited by

          Here is a working example of Bluetooth LE with GUI-O, but it uses ESP32 module...

          https://forum.gui-o.com/topic/19/basic-bluetooth-le

          The tutorial video is coming soon.

          Hope this helps.
          Regards.

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          • K
            kl3m3n
            last edited by kl3m3n

            NOTE: The application now supports NUS (Nordic UART Service) for BLE. As always, use the latest app version (Google Play or www.gui-o.com).

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