scan or startScan doesn't return anything on Android 7.1.2

[shfitz]

This may or may not be related to issue #391

Hardware : Nexus 6p running 7.1.2 Issue : Calling scan and startScan do not return any devices.

I have location services activated and ble devices are visible in the bluetooth settings and scanner apps, but not in phonegap applications.

The same code works on ios. Any thoughts.

[don]

@shfitz Do you see any errors if you run "adb logcat"?

Can you send me the code so I can use it for debugging?

/cc @tigoe

[tigoe]

@don https://github.com/tigoe/MakingThingsTalk2/tree/master/3rd_edition/chapter10/BleDatalogger is the project @shfitz is running. I didn't see errors running Android 6, but he did in 7.

[shfitz]

@don @tigoe I didn't see any errors, but to be honest, I'm not sure where to look for them.

Log from starting up attached. It seems that the scan starts before i actively initiate it, which isn't what the code is supposed to do.

pgap_androidoutput.txt

[don]

Can you see if you get different results using the 128 bit version of the UUID?

Replace FE10 with 0000FF10-0000-1000-8000-00805F9B34FB

https://github.com/tigoe/MakingThingsTalk2/blob/master/3rd_edition/chapter10/BleDatalogger/www/sketch.js#L17

[shfitz]

I can check that in the morning, but when I don’t specify a device, nothing populates the dropdown either. For example ble.scan([], 5, discoverDevice, bleError); returns nothing either.

[don]

If "ble.scan([], 5, discoverDevice, bleError);" doesn't work the 128-bit UUID probably won't either. I'll try and duplicate the problem here. (It might take a few days.)

[tigoe]

The drop-down doesn't populate until scan runs.

I don't have an Android 7 device, so nothing I can test with yet.

On May 4, 2017 10:42 AM, "Don Coleman" notifications@github.com wrote:

If "ble.scan([], 5, discoverDevice, bleError);" doesn't work the 128-bit UUID probably won't either. I'll try and duplicate the problem here. (It might take a few days.)

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/don/cordova-plugin-ble-central/issues/396#issuecomment-299205919, or mute the thread https://github.com/notifications/unsubscribe-auth/AAXOn7pHdWukcMBPlse5GvIRo4dZpzMaks5r2ePTgaJpZM4NO6ys .

[nicearma]

I have the same problem, i try to use scan or startScan and nothing happen, if i use enable and showBluetoothSettings functions seems to work fine. I'm using ionic 2 with this plugin and my device is One Plus 3 with android 7.1.1

[nicearma]

I'm trying to debug the app for fix the plugin, but the code source from the sdk and my phone aren't the same, but i can tell you that the findLowEnergyDevices is been call and the problem seem to be the startLeScan function call, i will try to find the source sdk code (ligne 2317 of BluetoothAdapter) that match with my device

[edupaz2]

Hello.

I'm having the same problem.

Device: Mediatek; Android Android 7.0; Ionic 3;

Code in app: scan() { this.ble.scan([], 5).subscribe( (device: any) => { console.log("Device "); }, (err) => { console.log("Error"); }, () => { console.log("Finished"); } ); }

Attaching logcat output: ble.logcat.txt

I saw in the logs MAC addresses being scanned, but I don´t receive any callbacks.

I'm using as a BLE device: http://wiki.seeed.cc/Arch_BLE/ And this apk is able to scan it: https://github.com/Seeed-Studio/BLE_Color_Pixels/blob/master/src/com/seeedstudio/ble/colorpixels/DeviceListActivity.java

Thanks!

[edupaz2]

Hi again.

If you turn on the Location on your device, onLeScan callback starts to receive calls.

Regards.

[don]

@shfitz @tigoe Sorry this took so long to track down. It looks like bad meta data in config.xml is causing this problem. I created a pull request with the updated config.xml to fix the issue https://github.com/tigoe/MakingThingsTalk2/pull/4

Below are the steps I used to reproduce the issue. If I repeated with my fork scan discovers devices.

Get the code mkdir ble-issue-396 cd ble-issue-396 git clone https://github.com/tigoe/MakingThingsTalk2.git

Start the data server

cd ble-issue-396/MakingThingsTalk2/3rd_edition/chapter10/dataServer
npm install
npm start

Create the peripheral.

Open a new terminal
cd MakingThingsTalk2/3rd_edition/chapter10/Arduino101GSRSensor

Open Arduino101GSRSensor.ino with Arduino IDE 1.8.3 Use the Board Manager to update/install Intel Curie Boards v2.0.2 Compile and deploy to Arduino 101

Compile the Cordova app

cd MakingThingsTalk2/3rd_edition/chapter10/BleDatalogger

Change the http://192.168.0.10:8080 in index.html and sketch.js to match ip address of laptop

cordova platform add android

Plug in Android phone & deploy the app

cordova run android --device

App will prompt for access to location. Choose Allow. Press the "Scan for devices" When scan is complete, select the Arduino 101 from the list.

Versions

• Node v 6.11.2
• Cordova v 7.0.1
• OS X 10.12.6
• Android 7.1.2 running on Nexus 5X