How to read URI hash on Un-provisioned Device Beacon with Android app

[toshi_glamo]

Hi,

I am trying to modify the Android nRF Mesh app to filter un-provisioned devices with URI hash contained on un-provisioned device beacon.

My question is how I can read the URI hash (4 bytes) in Android app.

I tried to check URI hash in onScanResult callback of ScannerRepository in ScannerRepository.java.

github.com/.../ScannerRepository.java

But, I can't find where the URI hash is stored.

I investigated the ScanResult passed as "result", but could not find anything related to URI hash.

It would be great if someone could advise me on how to get the URI hash on Android, using Android-nRF-Mesh-Library.

The mesh node I use is a nRF52840DK with Light Switch Client sample in nRF5 SDK for Mesh ver5.0.0. 

And, the phone which runs nRF Mesh app is Google Pixel 3a with Android ver.11.

I cloned nRF Mesh app from the repo below, and build it on Android Studio 4.2.1.

github.com/.../Android-nRF-Mesh-Library

Also, I am sure that the URI hash does exist on un-provisioned device beacon from the node.

I checked the content of the un-provisioned device beacon with nRF Sniffer for Bluetooth.

I am not an expert of Bluetooth mesh and Android.

This is my first time to post something here.

I would really appreciate any advice.

[Roshan Rajaratnam]

Hi, check here line number 168 will return a beacon if it's advertised and returns an UnprovisionedBeacon. However is there a reason for not using the Mesh Provisioning Service to filter unprovisioned devices?

[toshi_glamo]

Hi Roshan-san,

Thank you so much for the reply!

I have already checked updateScannerLiveData(), but I could not get the URI hash because the beaconData is null.

I added the Log.d output to the method like below:

    private void updateScannerLiveData(final ScanResult result) {
        Log.d("glamo-log", "ScannerRepository.updateScannerLiveData() -- start!");
        Log.d("glamo-log", "result is " + result.toString());
        final ScanRecord scanRecord = result.getScanRecord();
        if (scanRecord != null) {
            Log.d("glamo-log", "scanRecord is " + scanRecord.toString());
            if (scanRecord.getBytes() != null) {
                Log.d("glamo-log", "scanRecord.getBytes() is " + scanRecord.getBytes().toString());
                final byte[] beaconData = mMeshManagerApi.getMeshBeaconData(scanRecord.getBytes());
                if (beaconData != null) {
                    Log.d("glamo-log", "ScannerRepository.updateScannerLiveData() -- with beacon data!");
                    Log.d("glamo-log", "beaconData is " + beaconData.toString());
                    mScannerLiveData.deviceDiscovered(result, mMeshManagerApi.getMeshBeacon(beaconData));
                } else {
                    Log.d("glamo-log", "ScannerRepository.updateScannerLiveData() -- without beacon data!");
                    mScannerLiveData.deviceDiscovered(result);
                }
                Log.d("glamo-log", "ScannerRepository.updateScannerLiveData() -- device found!");
                mScannerStateLiveData.deviceFound();
            }
        }
        Log.d("glamo-log", "ScannerRepository.updateScannerLiveData() -- leave!");
    }

And I got the output like this:

---

... D/glamo-log: ScannerRepository.updateScannerLiveData() -- start!

... D/glamo-log: result is ScanResult{device=C6:32:88:E4:FB:CB, scanRecord=ScanRecord [advertiseFlags=6, serviceUuids=[00001827-0000-1000-8000-00805f9b34fb], manufacturerSpecificData=null, serviceData={00001827-0000-1000-8000-00805f9b34fb=[-10, -113, -68, 115, -13, 106, 72, -118, -117, -5, -28, -120, 50, -58, 85, 126, 0, 0]}, txPowerLevel=-2147483648, deviceName=nRF5x Mesh Switch], rssi=-51, timestampNanos=27762065700561, eventType=17, primaryPhy=1, secondaryPhy=0, advertisingSid=255, txPower=127, periodicAdvertisingInterval=0}

... D/glamo-log: scanRecord is ScanRecord [advertiseFlags=6, serviceUuids=[00001827-0000-1000-8000-00805f9b34fb], manufacturerSpecificData=null, serviceData={00001827-0000-1000-8000-00805f9b34fb=[-10, -113, -68, 115, -13, 106, 72, -118, -117, -5, -28, -120, 50, -58, 85, 126, 0, 0]}, txPowerLevel=-2147483648, deviceName=nRF5x Mesh Switch]

... D/glamo-log: scanRecord.getBytes() is [B@ea1bea5

... D/glamo-log: ScannerRepository.updateScannerLiveData() -- without beacon data!

... D/glamo-log: ScannerRepository.updateScannerLiveData() -- device found!

... D/glamo-log: ScannerRepository.updateScannerLiveData() -- leave!

---

Anyway, I didn't know that the Mesh Provisioning Service can be used to filter unprovisioned devices.

I will study about it, and report the result here.

But, it would be great if you could give me more information like the API to filter unprovisioned devices.

Thanks.

[Roshan Rajaratnam]

I would recommend using the Mesh Provisioning Service to filter the device because this is the simplest approach as the scanner will handle the filtering for you and this is how we have implemented the sample app as well. I will have to take a look at the UnprovisionedBeacon but i am busy with some other tasks right now. 

[toshi_glamo]

Thank you for the advice.  I will learn about the Mesh Provisioning Service.

Here is the screen shot of unprovisioned device beacon captured with nRF Sniffer, just in case you need it.