Cant find any devices while flutter blue scanning

[luissouza]

I try to find the devices with de oficial example: https://github.com/pauldemarco/flutter_blue/tree/master/example

I have several devices (BLE) that should be listed, but they NEVER appear. What am i doing wrong? Please, help me!

All the devices are (BLE).

[gumbypp]

Have you used another app (ex: LightBlue) to verify that your device can discover these devices?

[luissouza]

Have you used another app (ex: LightBlue) to verify that your device can discover these devices?

@gumbypp yes! Not appear to, why flutter_blue only appear BLE devices? I r

[SzymonGalazka]

I have the same issue. I tried with LG G6 with the example code and it shows nothing. Same if I search for paired devices. My devices are listed on LightBlue and on app built on top of flutter_bluetooth_serial.

scanForDevices() {

print('list of paired devices');
flutterBlue.connectedDevices.asStream().listen((paired) {
  print('paired device: $paired');
});
setState(() {
  _isScanning = true;
});
scanSubscription =
    flutterBlue.scan(timeout: Duration(seconds: 20)).listen((scanResult) {
  var device = scanResult.device;
  print('${device.name} found! rssi: ${scanResult.rssi}');
}, onDone: _stopScan);
scanSubscription.cancel();

} _logs: I/flutter (21110): list of paired devices D/BluetoothManager(21110): getConnectedDevices D/FlutterBluePlugin(21110): mGattServers size: 0 D/BluetoothAdapter(21110): isLeEnabled(): ON D/BluetoothLeScanner(21110): onScannerRegistered() - status=0 scannerId=5 mScannerId=0 I/flutter (21110): paired device: []

[RuijinYao]

I also encountered the same situation, but I can search for the device after I open the location of the phone.

[hicnar]

Same thing here, just one bluetooth device gets detected although plenty are on and visible for pairing. Tried all available ScanModes but no progress @RuijinYao by opening the location.. do you mean giving your app the location permission? To be honest after checking multiple BLE libraries and apps (LightBlue included) I am beginning to wonder if some manufacturers do something specific to prevent that their devices are detectable by anything other than the built in OS bluetooth software.

[alejo9719]

Same problem

[Skalate]

Me too, and I try agin by other bluetooth packages. but no one can work normally.

[KushalRathore09]

HI Team ,
 I am also facing the same problem. My use case is I am trying to connect bluetooth scanner device (Socket 7XI[68481F]) but can’t find it with this plugin, though other devices are visible . I also tried the other flutter bluetooth serial plugin but in my case I’ll be needing this functionality in my IOS app . Does any one has got any work around for this , it will be much appreciate . Thanks in advance .

[Skalate]

On Android devices, turn on GPS, and use all the functions in Flutter-blue. If not, phone can discover the device but cannot connect. Maybe you can turn on GPS. I haven't compiled the IOS program, maybe I can try it in a few days. I am a student studying automation, I don’t know much about android, but I have gained a lot of experience in the process of learning flutter. I am happy to share with you, I hope to keep in touch. 

 

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------------------ 原始邮件 ------------------ 发件人: "Kushal Rathore"<[email protected]>; 发送时间: 2020年2月22日(星期六) 晚上6:37 收件人: "pauldemarco/flutter_blue"<[email protected]>; 抄送: "李峦"<[email protected]>; "Comment"<[email protected]>; 主题: Re: [pauldemarco/flutter_blue] Cant find any devices while flutter blue scanning (#336)

HI Team ,
 I am also facing the same problem. My use case is I am trying to connect bluetooth scanner device (Socket 7XI[68481F]) but can’t find it with this plugin, though other devices are visible . I also tried the other flutter bluetooth serial plugin but in my case I’ll be needing this functionality in my IOS app . Does any one has got any work around for this , it will be much appreciate . Thanks in advance .

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[KushalRathore09]

@Skalate thanks for reverting back , but unfortunately your solution didn't work for me . Have anyone got any solutions for this . Thanks in advance .

[Skalate]

I don't know how to solve your problem, maybe you can try to contact the author of flutter-blue. Or use mixed development, it will take you some days to study the swift language. 

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------------------ 原始邮件 ------------------ 发件人: "Kushal Rathore"<[email protected]>; 发送时间: 2020年2月26日(星期三) 下午4:55 收件人: "pauldemarco/flutter_blue"<[email protected]>; 抄送: "李峦"<[email protected]>;"Mention"<[email protected]>; 主题: Re: [pauldemarco/flutter_blue] Cant find any devices while flutter blue scanning (#336)

@Skalate thanks for reverting back , but unfortunately your solution didn't work for me . Have anyone got any solutions for this . Thanks in advance .

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[GreeceNg]

Hi I also have the same problem with trying to connect my arduino bluetooth using this example code. Is there any solution for this problem?

[luissouza]

@GreeceNg I have this problem. Some devices are not listed in this bluetooth plugin because they are different tecnologies. I had to change the plugin and now im using this: https://pub.dev/packages/blue_thermal_printer.

[theali13]

Same Issue FlutterBluePlugin( 7582): mDevices size: 0

[ride4sun]

I have the same problem for me. I tried that 6 months ago with the same problem and I am surprised how little changed. @pauldemarco Hi Paul, do you have any input in this problem.

@luissouza I need basic write and read functionality with BLE. Would the package u use work fort that? Seems like this package works only for Android: https://pub.dev/packages/blue_thermal_printer.

Any alternative packages which are better maintained and work with ios would be highly appreciated. Any input?

[theali13]

I have the same problem for me. I tried that 6 months ago with the same problem and I am surprised how little changed. @pauldemarco Hi Paul, do you have any input in this problem.

@luissouza I need basic write and read functionality with BLE. Would the package u use work fort that? Seems like this package works only for Android: https://pub.dev/packages/blue_thermal_printer.

Any alternative packages which are better maintained and work with ios would be highly appreciated. Any input?

That package didn't work for me either it, it doesn't connect

[Skalate]

Hello, I checked some information and sorted out the following possible solutions.  1. Try programming with Object-c. Create a new empty directory and use 'flutter create -i objc my-flutter-app' to create a new project.  2. Use a lower version of the API. 'use_frameworks! platform :ios, '9.0'' If none of the above solutions can be solved, I highly recommend you to learn IOS development, Mixed development seems to be the only way

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联系我

 

------------------ 原始邮件 ------------------ 发件人: "theali13"<[email protected]>; 发送时间: 2020年3月25日(星期三) 上午6:37 收件人: "pauldemarco/flutter_blue"<[email protected]>; 抄送: "李峦"<[email protected]>;"Mention"<[email protected]>; 主题: Re: [pauldemarco/flutter_blue] Cant find any devices while flutter blue scanning (#336)

I have the same problem for me. I tried that 6 months ago with the same problem and I am surprised how little changed. @pauldemarco Hi Paul, do you have any input in this problem.

@luissouza I need basic write and read functionality with BLE. Would the package u use work fort that? Seems like this package works only for Android: https://pub.dev/packages/blue_thermal_printer.

Any alternative packages which are better maintained and work with ios would be highly appreciated. Any input?

That package didn't work for me either it, it doesn't connect

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or unsubscribe.

[ride4sun]

Please try to use this branch. Defects got fixed on this branch which might fix ur problems. Keep track of this #145 to see if a new package get created to get better support.

use this in your yaml for now:

flutter_blue:
    git:
        url: https://github.com/boskokg/flutter_blue.git
        ref: 0.7.1

[OmiWakode]

I try to find the devices with de oficial example: https://github.com/pauldemarco/flutter_blue/tree/master/example

I have several devices (BLE) that should be listed, but they NEVER appear. What am i doing wrong? Please, help me!

All the devices are (BLE).

I also have the same issue. I don't know whats wrong

[dirkbo]

Same here. I should be able to see a lot of devices around me, but all i can see is my connected SPEN (Galaxy Note10), which i actually can't see when i open my phones bluetooth settings and scan for devices...

[luissouza]

@ride4sun

Im using now esc_pos_bluetooth plugin. This plugin (esc_pos_bluetooth) cant fin my device too. I get this plugin example, and i change a bit, in the connection code, like this.

 printerManager.selectPrinter(PrinterBluetooth(
        flutterBluetoothBasic.BluetoothDevice.fromDocument(printerName, printerAddress, 0,true)));

Hope it helps!

[Akilesh30]

Hii I'm working on social distancing app I'm facing same issue couldn't get any mobile devices in scanresult

[javiervalero31]

I Have the same problem ! When I start the scanning, the stream scanResults don't return anything... This feature is the most basic and don't work ! Any idea ?

[luissouza]

@javiervalero31, i think, is not return anything because all the devices that you are looking for are not BLE, and this plugin just show BLE devices.. Look in play store for BLE app, this app shows to you if your device is BLE (Bluetooh low energy).

[nadjwarazali]

I have the same problem before and all I did is turning on the location/ GPS and try to re-scan again and it works for my ESP32 BLE!

[NongBritee]

I'm facing same problem too. It works on many device to connect my thermal printer. e.g. iphone, ipad, redmi, huewei p30. But it's not working for my samsung note10lite and note10+. Any idea?

[Detlev1]

@nadjwarazali Thank you it worked

[afarre]

Had the same problem with https://github.com/lupyuen/flutter-blue-sample example (based on pauldemarco's) and as others mentioned, turning on GPS (as well as bluetooth) solved this problem. I find it odd that you need location ON in order to find bluetooth devices. Anyone knows why?

[alejo9719]

Google made it a requirement for using BLE in Android. https://www.polidea.com/blog/a-curious-relationship-android-ble-and-location/

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El lun., 19 oct. 2020 a las 9:01, afarre ([email protected]) escribió:

Had the same problem with https://github.com/lupyuen/flutter-blue-sample example (based on pauldemarco's) and as others mentioned, turing on GPS (as well as bluetooth) solved this problem. I find it odd that you need location ON in order to find bluetooth devices. Anyone knows why?

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[ganeshlg]

Turn on GPS it will work fine...!!!