{"id":1257,"date":"2021-05-18T01:15:10","date_gmt":"2021-05-17T16:15:10","guid":{"rendered":"http:\/\/blog.box.kr\/?p=1257"},"modified":"2021-05-18T01:15:14","modified_gmt":"2021-05-17T16:15:14","slug":"ble-%ec%82%ac%ec%9a%a9%ed%95%98%ea%b8%b0","status":"publish","type":"post","link":"https:\/\/blog.box.kr\/?p=1257","title":{"rendered":"BLE \uc0ac\uc6a9\ud558\uae30"},"content":{"rendered":"\n

\ub77c\uc774\ube0c\ub7ec\ub9ac \ucd94\uac00 \ubc0f SCAN \uae30\ub2a5 \uad6c\ud604
flutter_ble_lib
https:\/\/pub.dev\/packages\/flutter_ble_lib

permission_handler
https:\/\/pub.dev\/packages\/permission_handler

\ud504\ub85c\uc81d\ud2b8\uc5d0 \uc548\ub4dc\ub85c\uc774\ub4dc SDK \ubc84\uc804\uc774 \ub0ae\uac8c \uc124\uc815\ub418\uc5b4 \uc544\ub798\uc640 \uac19\uc740 \uc5d0\ub7ec\uac00 \ubc1c\uc0dd\ud560 \uc218\uc774\ub2e4
<\/p>\n\n\n\n

ble_example\\android\\app\\src\\debug\\AndroidManifest.xml Error: uses-sdk:minSdkVersion 16 cannot be smaller than version 18 declared in library [:flutter_ble_lib] E:\\study\\flutter\\ble_example\\build\\flutter_ble_lib\\intermediates\\library_manifest\\debug\\AndroidManifest.xml as the library might be using APIs not available in 16 Suggestion: use a compatible library with a minSdk of at most 16, or increase this project’s minSdk version to at least 18, or use tools:overrideLibrary=”com.polidea.flutter_ble_lib” to force usage (may lead to runtime failures) FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ‘:app:processDebugManifest’. > Manifest merger failed : uses-sdk:minSdkVersion 16 cannot be smaller than version 18 declared in library [:flutter_ble_lib] E:\\study\\flutter\\ble_example\\build\\flutter_ble_lib\\intermediates\\library_manifest\\debug\\AndroidManifest.xml as the library might be using APIs not available in 16 Suggestion: use a compatible library with a minSdk of at most 16, or increase this project’s minSdk version to at least 18, or use tools:overrideLibrary=”com.polidea.flutter_ble_lib” to force usage (may lead to runtime failures) * Try: Run with –stacktrace option to get the stack trace. Run with –info or –debug option to get more log output. Run with –scan to get full insights. * Get more help at https:\/\/help.gradle.org BUILD FAILED in 1m 3s Exception: Gradle task assembleDebug failed with exit code 1 Exited (sigterm)<\/p>\n\n\n\n


\ud574\ub2f9 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\ub824\uba74 \ucd5c\uc18c SDK \ubc84\uc804\uc744 1.8 \uc774\uc0c1\uc73c\ub85c \uc62c\ub824\uc57c \ud55c\ub2e4.
<\/p>\n\n\n\n

android\/app\/build.gradle”\uc744 \ud30c\uc77c\uc5d0\uc11c<\/p>\n\n\n\n

defaultConfig \ud56d\ubaa9 \uc911 minSdkVersion\ub97c 18 \uc774\uc0c1\uc73c\ub85c \ubcc0\uacbd \ud574\uc57c\ud568.

<\/p>\n\n\n\n

import 'dart:io';\r\nimport 'package:flutter\/material.dart';\r\nimport 'package:flutter_ble_lib\/flutter_ble_lib.dart';\r\nimport 'package:permission_handler\/permission_handler.dart';\r\n\r\nvoid main() {\r\n  runApp(MyApp());\r\n}\r\n\r\nclass MyApp extends StatelessWidget {\r\n  @override\r\n  Widget build(BuildContext context) {\r\n    return MaterialApp(\r\n      title: 'Flutter BLE Demo',\r\n      home: MyHomePage(title: 'Flutter BLE Demo Page'),\r\n    );\r\n  }\r\n}\r\n\r\nclass MyHomePage extends StatefulWidget {\r\n  MyHomePage({Key key, this.title}) : super(key: key);\r\n  final String title;\r\n\r\n  @override\r\n  _MyHomePageState createState() => _MyHomePageState();\r\n}\r\n\r\nclass _MyHomePageState extends State<MyHomePage> {\r\n  BleManager _bleManager = BleManager(); \/\/BLE \uba54\ub2c8\uc800\r\n  bool _isScanning= false;               \/\/\uc2a4\uce94 \ud655\uc778\uc6a9\r\n  List<BleDeviceItem> deviceList = [];   \/\/BLE \uc815\ubcf4 \uc800\uc7a5\uc6a9\r\n\r\n  @override\r\n  void initState() {\r\n    init(); \/\/BLE \ucd08\uae30\ud654\r\n    super.initState();\r\n  }\r\n\r\n  void init() async {\r\n      \/\/BLE \uc0dd\uc131\r\n      await _bleManager.createClient(\r\n        restoreStateIdentifier: \"example-restore-state-identifier\",\r\n        restoreStateAction: (peripherals) {\r\n          peripherals?.forEach((peripheral) {\r\n            print(\"Restored peripheral: ${peripheral.name}\");\r\n          });\r\n        })\r\n        .catchError((e) => print(\"Couldn't create BLE client  $e\"))\r\n        .then((_) => _checkPermissions()) \/\/BLE \uc0dd\uc131 \ud6c4 \ud37c\ubbf8\uc158 \uccb4\ud06c\r\n        .catchError((e) => print(\"Permission check error $e\"));\r\n        \/\/.then((_) => _waitForBluetoothPoweredOn())        \r\n  }\r\n  \/\/\ud37c\ubbf8\uc158 \uccb4\ud06c \ubc0f \uc5c6\uc73c\uba74 \ud37c\ubbf8\uc158 \ub3d9\uc758 \ud654\uba74 \ucd9c\ub825\r\n  _checkPermissions() async {\r\n    if (Platform.isAndroid) {\r\n      if (await Permission.contacts.request().isGranted) {        \r\n      }\r\n      Map<Permission, PermissionStatus> statuses = await [\r\n        Permission.location\r\n      ].request();\r\n      print(statuses[Permission.location]);      \r\n    }\r\n  }\r\n\r\n  \/\/\uc2a4\uce94 ON\/OFF \r\n  void scan() async {\r\n    if(!_isScanning) {\r\n      deviceList.clear();\r\n      _bleManager.startPeripheralScan().listen((scanResult) {          \r\n        \/\/ \ud398\ub9ac\ud398\ub7f4 \ud56d\ubaa9\uc5d0 \uc774\ub984\uc774 \uc788\uc73c\uba74 \uadf8\uac78 \uc0ac\uc6a9\ud558\uace0 \r\n        \/\/ \uc5c6\ub2e4\uba74 \uc5b4\ub4dc\ubc84\ud0c0\uc774\uc9c0\uba3c\ud2b8 \ub370\uc774\ud130\uc758 \uc774\ub984\uc744 \uc0ac\uc6a9\ud558\uace0 \uadf8\uac83 \ub9c8\uc838 \uc5c6\ub2e4\uba74 Unknown\uc73c\ub85c \ud45c\uc2dc\r\n        var name = scanResult.peripheral.name ?? scanResult.advertisementData.localName ?? \"Unknown\";\r\n        \/*\r\n        \/\/ \uc5ec\ub7ec\uac00\uc9c0 \uc815\ubcf4 \ud655\uc778\r\n        print(\"Scanned Name ${name}, RSSI ${scanResult.rssi}\");        \r\n        print(\"\\tidentifier(mac) ${scanResult.peripheral.identifier}\"); \/\/mac address\r\n        print(\"\\tservice UUID : ${scanResult.advertisementData.serviceUuids}\");        \r\n        print(\"\\tmanufacture Data : ${scanResult.advertisementData.manufacturerData}\");        \r\n        print(\"\\tTx Power Level : ${scanResult.advertisementData.txPowerLevel}\");\r\n        print(\"\\t${scanResult.peripheral}\");\r\n        *\/ \r\n        \/\/\uc774\ubbf8 \uac80\uc0c9\ub41c \uc7a5\uce58\uc778\uc9c0 \ud655\uc778 mac \uc8fc\uc18c\ub85c \ud655\uc778\r\n        var findDevice = deviceList.any((element) {                    \r\n          if(element.peripheral.identifier == scanResult.peripheral.identifier)\r\n          {\r\n            \/\/\uc774\ubbf8 \uc874\uc7ac\ud558\uba74 \uae30\uc874 \uac12\uc744 \uac31\uc2e0.\r\n            element.peripheral = scanResult.peripheral;\r\n            element.advertisementData = scanResult.advertisementData;            \r\n            element.rssi = scanResult.rssi;\r\n            return true;            \r\n          }        \r\n          return false;\r\n        });\r\n        \/\/\ucc98\uc74c \ubc1c\uacac\ub41c \uc7a5\uce58\ub77c\uba74 devicelist\uc5d0 \ucd94\uac00\r\n        if(!findDevice) {\r\n          deviceList.add(BleDeviceItem(name, scanResult.rssi, scanResult.peripheral, scanResult.advertisementData));\r\n        }\r\n        \/\/\uac31\uae34 \uc801\uc6a9.\r\n        setState((){});\r\n      });      \r\n      \/\/\uc2a4\uce94\uc911\uc73c\ub85c \ubcc0\uc218 \ubcc0\uacbd\r\n      setState(() { _isScanning = true; });\r\n    }\r\n    else {      \r\n      \/\/\uc2a4\uce94\uc911\uc774\uc5c8\ub2e4\uba74 \uc2a4\uce94 \uc815\uc9c0\r\n      _bleManager.stopPeripheralScan();      \r\n      setState(() { _isScanning = false; });\r\n    }\r\n  }\r\n  \r\n  \/\/\ub514\ubc14\uc774\uc2a4 \ub9ac\uc2a4\ud2b8 \ud654\uba74\uc5d0 \ucd9c\ub825\r\n  list() {\r\n    return ListView.builder( \r\n      itemCount: deviceList.length, \r\n      itemBuilder: (context, index) { \r\n        return ListTile( \r\n          \/\/\ub514\ubc14\uc774\uc2a4 \uc774\ub984\uacfc \ub9e5\uc8fc\uc18c \uadf8\ub9ac\uace0 \uc2e0\ud638 \uc138\uae30\ub97c \ud45c\uc2dc\ud55c\ub2e4.\r\n          title: Text(deviceList[index].deviceName), \r\n          subtitle: Text(deviceList[index].peripheral.identifier),\r\n          trailing: Text(\"${deviceList[index].rssi}\"),          \r\n        ); \r\n      },\r\n    );\r\n  }\r\n\r\n  @override\r\n  Widget build(BuildContext context) {\r\n    return Scaffold(\r\n      appBar: AppBar(\r\n        title: Text(widget.title),\r\n      ),\r\n      body: Center(\r\n            \/\/\ub514\ubc14\uc774\uc2a4 \ub9ac\uc2a4\ud2b8 \ud568\uc218 \ud638\ucd9c\r\n            child: list(),\r\n      ),\r\n      floatingActionButton: FloatingActionButton(\r\n        onPressed: scan, \/\/\ubc84\ud2bc\uc774 \ub20c\ub9ac\uba74 \uc2a4\uce94 ON\/OFF \ub3d9\uc791       \r\n        child: Icon(_isScanning?Icons.stop:Icons.bluetooth_searching), \/\/_isScanning \ubcc0\uc218\uc5d0 \ub530\ub77c \uc544\uc774\ucf58 \ud45c\uc2dc \ubcc0\uacbd\r\n      ),\r\n    );\r\n  }\r\n}\r\n\r\n\/\/\ub514\ubc14\uc774\uc2a4 \uc815\ubcf4 \uc800\uc7a5\uc6a9 \ud074\ub798\uc2a4\r\nclass BleDeviceItem {\r\n    String deviceName;\r\n    Peripheral peripheral;\r\n    int rssi;\r\n    AdvertisementData advertisementData;   \r\n    BleDeviceItem(this.deviceName, this.rssi, this.peripheral, this.advertisementData);\r\n}<\/code><\/pre>\n\n\n\n

\uc5f0\uacb0 + \ud574\uc81c \uae30\ub2a5 \uad6c\ud604

<\/p>\n\n\n\n
import 'dart:io';\r\nimport 'package:flutter\/material.dart';\r\nimport 'package:flutter_ble_lib\/flutter_ble_lib.dart';\r\nimport 'package:permission_handler\/permission_handler.dart';\r\n\r\nvoid main() {\r\n  runApp(MyApp());\r\n}\r\n\r\nclass MyApp extends StatelessWidget {\r\n  @override\r\n  Widget build(BuildContext context) {\r\n    return MaterialApp(\r\n      title: 'Flutter BLE Demo',\r\n      home: MyHomePage(title: 'Flutter BLE Demo Page'),\r\n    );\r\n  }\r\n}\r\n\r\nclass MyHomePage extends StatefulWidget {\r\n  MyHomePage({Key key, this.title}) : super(key: key);\r\n  final String title;\r\n\r\n  @override\r\n  _MyHomePageState createState() => _MyHomePageState();\r\n}\n\n\nclass _MyHomePageState extends State<MyHomePage> {\r\n\r\n  BleManager _bleManager = BleManager();\r\n  bool _isScanning = false;      \r\n  bool _connected = false;\r\n  Peripheral _curPeripheral;           \/\/ \uc5f0\uacb0\ub41c \uc7a5\uce58 \ubcc0\uc218\r\n  List<BleDeviceItem> deviceList = []; \/\/ BLE \uc7a5\uce58 \ub9ac\uc2a4\ud2b8 \ubcc0\uc218\r\n  String _statusText = '';             \/\/ BLE \uc0c1\ud0dc \ubcc0\uc218\r\n\r\n  @override\r\n  void initState() {\r\n    init();\r\n    super.initState();\r\n  }\r\n\r\n  \/\/ BLE \ucd08\uae30\ud654 \ud568\uc218\r\n  void init() async {\r\n      \/\/ble \ub9e4\ub2c8\uc800 \uc0dd\uc131\r\n      await _bleManager.createClient(\r\n        restoreStateIdentifier: \"example-restore-state-identifier\",\r\n        restoreStateAction: (peripherals) {\r\n          peripherals?.forEach((peripheral) {\r\n            print(\"Restored peripheral: ${peripheral.name}\");\r\n          });\r\n        })\r\n        .catchError((e) => print(\"Couldn't create BLE client  $e\"))\r\n        .then((_) => _checkPermissions())  \/\/\ub9e4\ub2c8\uc800 \uc0dd\uc131\ub418\uba74 \uad8c\ud55c \ud655\uc778\r\n        .catchError((e) => print(\"Permission check error $e\"));\r\n  }\r\n\r\n  \/\/ \uad8c\ud55c \ud655\uc778 \ud568\uc218 \uad8c\ud55c \uc5c6\uc73c\uba74 \uad8c\ud55c \uc694\uccad \ud654\uba74 \ud45c\uc2dc, \uc548\ub4dc\ub85c\uc774\ub4dc\ub9cc \uc0c1\uad00 \uc788\uc74c\r\n  _checkPermissions() async {\r\n    if (Platform.isAndroid) {\r\n      if (await Permission.contacts.request().isGranted) {        \r\n      }\r\n      Map<Permission, PermissionStatus> statuses = await [\r\n        Permission.location\r\n      ].request();\r\n      print(statuses[Permission.location]);      \r\n    }\r\n  }\r\n  \r\n  \/\/\uc7a5\uce58 \ud654\uba74\uc5d0 \ucd9c\ub825\ud558\ub294 \uc704\uc82f \ud568\uc218\r\n  list() {\r\n    return ListView.builder( \r\n      itemCount: deviceList.length, \r\n      itemBuilder: (context, index) { \r\n        return ListTile( \r\n          title: Text(deviceList[index].deviceName), \r\n          subtitle: Text(deviceList[index].peripheral.identifier),\r\n          trailing: Text(\"${deviceList[index].rssi}\"),          \r\n          onTap: () {  \/\/ \ub9ac\uc2a4\ud2b8\uc911 \ud55c\uac1c\ub97c \ud0ed(\ud130\uce58) \ud558\uba74 \ud574\ub2f9 \ub514\ubc14\uc774\uc2a4\uc640 \uc5f0\uacb0\uc744 \uc2dc\ub3c4\ud55c\ub2e4.\r\n            connect(index);\r\n          }\r\n        ); \r\n      },      \r\n    );\r\n  }\r\n  \/\/scan \ud568\uc218\r\n  void scan() async {\r\n    if(!_isScanning) {\r\n      deviceList.clear(); \/\/\uae30\uc874 \uc7a5\uce58 \ub9ac\uc2a4\ud2b8 \ucd08\uae30\ud654\r\n      \/\/SCAN \uc2dc\uc791\r\n      _bleManager.startPeripheralScan().listen((scanResult) {\r\n        \/\/listen \uc774\ubca4\ud2b8 \ud615\uc2dd\uc73c\ub85c \uc7a5\uce58\uac00 \ubc1c\uacac\ub418\uba74 \ud574\ub2f9 \ub8e8\ud2f4\uc744 \uacc4\uc18d \ud0d0.\r\n        \/\/periphernal.name\uc774 \uc5c6\uc73c\uba74 advertisementData.localName\ud655\uc778 \uc774\uac83\ub3c4 \uc5c6\ub2e4\uba74 unknown\uc73c\ub85c \ud45c\uc2dc\r\n        var name = scanResult.peripheral.name ?? scanResult.advertisementData.localName ?? \"Unknown\";   \r\n        \/\/ \uae30\uc874\uc5d0 \uc874\uc7ac\ud558\ub294 \uc7a5\uce58\uba74 \uc5c5\ub370\uc774\ud2b8\r\n        var findDevice = deviceList.any((element) {                    \r\n          if(element.peripheral.identifier == scanResult.peripheral.identifier)\r\n          {\r\n            element.peripheral = scanResult.peripheral;\r\n            element.advertisementData = scanResult.advertisementData;            \r\n            element.rssi = scanResult.rssi;\r\n            return true;            \r\n          }        \r\n          return false;\r\n        });\r\n        \/\/ \uc0c8\ub85c \ubc1c\uacac\ub41c \uc7a5\uce58\uba74 \ucd94\uac00\r\n        if(!findDevice) {\r\n          deviceList.add(BleDeviceItem(name, scanResult.rssi, scanResult.peripheral, scanResult.advertisementData));\r\n        }\r\n        \/\/\ud398\uc774\uc9c0 \uac31\uc2e0\uc6a9\r\n        setState((){});\r\n      });      \r\n      setState(() { \/\/BLE \uc0c1\ud0dc\uac00 \ubcc0\uacbd\ub418\uba74 \ud654\uba74\ub3c4 \uac31\uc2e0\r\n        _isScanning = true;  \r\n        setBLEState('Scanning');\r\n      });\r\n    }\r\n    else {      \r\n      \/\/\uc2a4\ucf04\uc911\uc774\uc5c8\uc73c\uba74 \uc2a4\uce94 \uc911\uc9c0\r\n      _bleManager.stopPeripheralScan();      \r\n      setState(() { \/\/BLE \uc0c1\ud0dc\uac00 \ubcc0\uacbd\ub418\uba74 \ud398\uc774\uc9c0\ub3c4 \uac31\uc2e0\r\n        _isScanning = false; \r\n        setBLEState('Stop Scan');\r\n      });\r\n    }\r\n  }\r\n\r\n  \/\/BLE \uc5f0\uacb0\uc2dc \uc608\uc678 \ucc98\ub9ac\ub97c \uc704\ud55c \ub798\ud551 \ud568\uc218\r\n  _runWithErrorHandling(runFunction) async {\r\n    try {  \r\n      await runFunction();\r\n    } on BleError catch (e) {\r\n      print(\"BleError caught: ${e.errorCode.value} ${e.reason}\");\r\n    } catch (e) {\r\n      if (e is Error) {\r\n        debugPrintStack(stackTrace: e.stackTrace);\r\n      }\r\n      print(\"${e.runtimeType}: $e\");\r\n    }\r\n  }\r\n\r\n  \/\/ \uc0c1\ud0dc \ubcc0\uacbd\ud558\uba74\uc11c \ud398\uc774\uc9c0\ub3c4 \uac31\uc2e0\ud558\ub294 \ud568\uc218\r\n  void setBLEState(txt){\r\n    setState(() => _statusText = txt);\r\n  }\r\n\r\n \/\/\uc5f0\uacb0 \ud568\uc218\r\n connect(index) async {\r\n    if(_connected) {  \/\/\uc774\ubbf8 \uc5f0\uacb0\uc0c1\ud0dc\uba74 \uc5f0\uacb0 \ud574\uc81c\ud6c4 \uc885\ub8cc\r\n      await _curPeripheral?.disconnectOrCancelConnection();\r\n      return;\r\n    }\r\n\r\n    \/\/\uc120\ud0dd\ud55c \uc7a5\uce58\uc758 peripheral \uac12\uc744 \uac00\uc838\uc628\ub2e4.\r\n    Peripheral peripheral = deviceList[index].peripheral;        \r\n\r\n    \/\/\ud574\ub2f9 \uc7a5\uce58\uc640\uc758 \uc5f0\uacb0\uc0c1\ud0dc\ub97c \uad00\ucd2c\ud558\ub294 \ub9ac\uc2a4\ub108 \uc2e4\ud589\r\n    peripheral.observeConnectionState(emitCurrentValue: true)\r\n      .listen((connectionState) {\r\n      \/\/ \uc5f0\uacb0\uc0c1\ud0dc\uac00 \ubcc0\uacbd\ub418\uba74 \ud574\ub2f9 \ub8e8\ud2f4\uc744 \ud0d0.\r\n      switch(connectionState) {        \r\n        case PeripheralConnectionState.connected: {  \/\/\uc5f0\uacb0\ub428\r\n          _curPeripheral = peripheral;\r\n          setBLEState('connected');\r\n        }        \r\n        break;\r\n        case PeripheralConnectionState.connecting: { setBLEState('connecting'); }\/\/\uc5f0\uacb0\uc911\r\n        break;\r\n        case PeripheralConnectionState.disconnected: { \/\/\ud574\uc81c\ub428\r\n            _connected=false;         \r\n            print(\"${peripheral.name} has DISCONNECTED\"); \r\n            setBLEState('disconnected');\r\n        }\r\n        break;\r\n        case PeripheralConnectionState.disconnecting: { setBLEState('disconnecting');}\/\/\ud574\uc81c\uc911\r\n        break;\r\n        default:{\/\/\uc54c\uc218\uc5c6\uc74c...\r\n            print(\"unkown connection state is: \\n $connectionState\");\r\n        }\r\n        break;\r\n      }\r\n    });\r\n\r\n    _runWithErrorHandling(() async {\r\n      \/\/\ud574\ub2f9 \uc7a5\uce58\uc640 \uc774\ubbf8 \uc5f0\uacb0\ub418\uc5b4 \uc788\ub294\uc9c0 \ud655\uc778\r\n      bool isConnected = await peripheral.isConnected();\r\n      if(isConnected) {\r\n        print('device is already connected');\r\n        \/\/\uc774\ubbf8 \uc5f0\uacb0\ub418\uc5b4 \uc788\uae30\ub54c\ubb38\uc5d0 \ubb34\uc2dc\ud558\uace0 \uc885\ub8cc.. \r\n        return;\r\n      }\r\n\r\n      \/\/\uc5f0\uacb0 \uc2dc\uc791!\r\n      await peripheral.connect().then((_) {\r\n        \/\/\uc5f0\uacb0\uc774 \ub418\uba74 \uc7a5\uce58\uc758 \ubaa8\ub4e0 \uc11c\ube44\uc2a4\uc640 \uce90\ub9ad\ud130\ub9ac\uc2a4\ud2f1\uc744 \uac80\uc0c9\ud55c\ub2e4.\r\n        peripheral.discoverAllServicesAndCharacteristics()\r\n        .then((_) => peripheral.services())\r\n        .then((services) async {           \r\n          print(\"PRINTING SERVICES for ${peripheral.name}\");\r\n          \/\/\uac01\uac01\uc758 \uc11c\ube44\uc2a4\uc758 \ud558\uc704 \uce90\ub9ad\ud130\ub9ac\uc2a4\ud2f1 \uc815\ubcf4\ub97c \ub514\ubc84\uae45\ucc3d\uc5d0 \ud45c\uc2dc\ud55c\ub2e4.\r\n          for(var service in services) {\r\n            print(\"Found service ${service.uuid}\");\r\n            List<Characteristic> characteristics = await service.characteristics();\r\n            for( var characteristic in characteristics ) {\r\n              print(\"${characteristic.uuid}\");\r\n            }\r\n          }\r\n          \/\/\ubaa8\ub4e0 \uacfc\uc815\uc774 \ub9c8\ubb34\ub9ac\ub418\uba74 \uc5f0\uacb0\ub418\uc5c8\ub2e4\uace0 \ud45c\uc2dc\r\n          _connected = true;                    \r\n          print(\"${peripheral.name} has CONNECTED\");     \r\n        });\r\n      });\r\n    });\r\n  }\r\n \r\n  \/\/\ud398\uc774\uc9c0 \uad6c\uc131\r\n  @override\r\n  Widget build(BuildContext context) {\r\n    return Scaffold(\r\n      appBar: AppBar(\r\n        title: Text(widget.title),\r\n      ),\r\n      body: Center(\r\n        child: Column(\r\n          children: <Widget>[\r\n            Expanded(\r\n              flex: 1,\r\n              child: list(), \/\/\ub9ac\uc2a4\ud2b8 \ucd9c\ub825\r\n            ),\r\n            Container(\r\n              child: Row(\r\n                children: <Widget>[\r\n                  RaisedButton( \/\/scan \ubc84\ud2bc\r\n                    onPressed: scan,\r\n                    child: Icon(_isScanning?Icons.stop:Icons.bluetooth_searching),\r\n                  ),\r\n                  SizedBox(width: 10,),\r\n                  Text(\"State : \"), Text(_statusText), \/\/\uc0c1\ud0dc \uc815\ubcf4 \ud45c\uc2dc\r\n                ],\r\n              ),  \r\n            ),\r\n          ],\r\n        ),\r\n      ),\r\n    );\r\n  }\r\n}\r\n\r\n\/\/BLE \uc7a5\uce58 \uc815\ubcf4 \uc800\uc7a5 \ud074\ub798\uc2a4\r\nclass BleDeviceItem {\r\n    String deviceName;\r\n    Peripheral peripheral;\r\n    int rssi;\r\n    AdvertisementData advertisementData;   \r\n    BleDeviceItem(this.deviceName, this.rssi, this.peripheral, this.advertisementData);\r\n}<\/code><\/pre>\n\n\n\n
\uc608\ub97c \ub4e4\uc5b4 \uc704\uc640 \uac19\uc774 Nordic_UART\ub97c \uc120\ud0dd\ud574 \uc5f0\uacb0\uc744 \ud558\uac8c \ub418\uba74 \uc544\ub798\uc640 \uac19\uc740 \uba54\uc2dc\uc9c0\ub4e4\uc744 \ubcfc \uc218 \uc788\ub2e4.
<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\uc704\uc5d0 \ud45c\uc2dc\ud55c \uac83\ub4e4\uc740 \ud574\ub2f9 \uc7a5\uce58\uc5d0\uc11c \uc81c\uacf5\ud558\ub294 \uc11c\ube44\uc2a4 UUID\uc774\ub2e4.
<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\uadf8\ub9ac\uace0 \uc774\uac83\uc740 \uac01 \uc11c\ube44\uc2a4\uc758 \uce90\ub9ac\ud130\ub9ac\uc2a4\ud2f1\uc774\ub2e4.
<\/p>\n\n\n\n
\"\"
\ub9c8\uc9c0\ub9c9\uc73c\ub85c \ub178\ub974\ub515 UART \uc7a5\uce58\uc758 \uacbd\uc6b0 \uc704\uc5d0 \ud45c\uc2dc\ud55c \uc11c\ube44\uc2a4 UUID\uc640 \ubc14\ub85c \uc544\ub798 \uce90\ub9ad\ud130\ub9ac\uc2a4\ud2f1 UUID 2\uac00\uc9c0\ub9cc \uc54c\uace0 \uc788\uc73c\uba74 \ud1b5\uc2e0\uc744 \ud560 \uc218 \uc788\ub2e4.
\u200b
\ub2e4\uc74c\ubc88\uc5d4 \ud574\ub2f9 \uc815\ubcf4\ub4e4\ub85c \ub370\uc774\ud130\ub97c \uc8fc\uace0\ubc1b\ub294 \ubc29\ubc95\uc744 \uc54c\uc544\ubcfc \uac83\uc774\ub2e4.
\uc7a0\uae50 \ub9db\ubcf4\uae30\ub85c \ubcf4\uc790\uba74 \ub2e4\uc74c\uacfc \uac19\ub2e4.
\uc6b0\uc120 \ub370\uc774\ud130 \ubcf4\ub0bc \ub54c

<\/figcaption><\/figure>\n\n\n\n
\/\/\ubcf4\ub0bc\ub54c\r\nperipheral.writeCharacteristic(\r\n      BLE_SERVICE_UUID,\r\n      BLE_RX_CHARACTERISTIC,\r\n      Uint8List.fromList(message.codeUnits),\r\n      false);  \n\n\/\/\ubc1b\ub294 \uce90\ub9ac\ud130\ub9ac\uc2a4\ud2f1 \ubaa8\ub2c8\ud130\ub9c1 ON \ud568\uc218, \ubcf4\ud1b5 Notification Enable \uc815\ub3c4\ub85c \uc0dd\uac01\ud558\uba74\ub420 \uac83 \uac19\ub2e4.\r\ncharacteristicUpdates = peripheral.monitorCharacteristic(\r\n     BLE_SERVICE_UUID, \r\n     BLE_TX_CHARACTERISTIC);\r\n\r\n\/\/\ub370\uc774\ud130 \ubc1b\ub294 \ub9ac\uc2a4\ub108 \ud578\ub4e4 \ubcc0\uc218\r\nStreamSubscription monitoringStreamSubscription;\r\n\r\n\/\/\uc774\ubbf8 \ub9ac\uc2a4\ub108\uac00 \uc788\ub2e4\uba74 \ucde8\uc18c\r\nawait monitoringStreamSubscription?.cancel(); \/\/ ?. = \ud574\ub2f9\uac1d\uccb4\uac00 null\uc774\uba74 \ubb34\uc2dc\ud558\uace0 \ub118\uc5b4\uac10.\r\nmonitoringStreamSubscription = characteristicUpdates.listen( (value) {        \r\n     print(\"read data : ${value.value}\");  \/\/\ub370\uc774\ud130 \ucd9c\ub825\r\n   },\r\n   onError: (error) {\r\n     print(\"Error while monitoring characteristic \\n$error\"); \/\/\uc2e4\ud328\uc2dc\r\n   },\r\n   cancelOnError: true, \/\/\uc5d0\ub7ec \ubc1c\uc0dd\uc2dc \uc790\ub3d9\uc73c\ub85c listen \ucde8\uc18c\r\n);<\/code><\/pre>\n\n\n\n


\uc774\uac8c \ub354 \uc88b\ub2e4\ub124…
https:\/\/pub.dev\/packages\/flutter_blue

<\/p>\n","protected":false},"excerpt":{"rendered":"
\ub77c\uc774\ube0c\ub7ec\ub9ac \ucd94\uac00 \ubc0f SCAN \uae30\ub2a5 \uad6c\ud604flutter_ble_libhttps:\/\/pub.dev\/packages\/flutter_ble_lib permission_handlerhttps:\/\/pub.dev\/packages\/permission_handler \ud504\ub85c\uc81d\ud2b8\uc5d0 \uc548\ub4dc\ub85c\uc774\ub4dc SDK \ubc84\uc804\uc774 \ub0ae\uac8c \uc124\uc815\ub418\uc5b4 \uc544\ub798\uc640 \uac19\uc740 \uc5d0\ub7ec\uac00 \ubc1c\uc0dd\ud560 \uc218\uc774\ub2e4 ble_example\\android\\app\\src\\debug\\AndroidManifest.xml Error: uses-sdk:minSdkVersion 16 cannot be smaller than version 18 declared in library [:flutter_ble_lib] E:\\study\\flutter\\ble_example\\build\\flutter_ble_lib\\intermediates\\library_manifest\\debug\\AndroidManifest.xml as the library might be using APIs not available in 16 Suggestion: use a compatible library with a minSdk of at most 16, or increase this project’s minSdk version to at least 18, or use tools:overrideLibrary=”com.polidea.flutter_ble_lib” to force usage (may lead to runtime failures) FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ‘:app:processDebugManifest’. > Manifest merger failed : uses-sdk:minSdkVersion 16 cannot be smaller than version 18 declared in library [:flutter_ble_lib] E:\\study\\flutter\\ble_example\\build\\flutter_ble_lib\\intermediates\\library_manifest\\debug\\AndroidManifest.xml as the library might be using APIs not available in 16 Suggestion: use a compatible library with a minSdk of at most 16, or increase this project’s minSdk version to at least 18, or use tools:overrideLibrary=”com.polidea.flutter_ble_lib” to force usage (may lead to runtime failures) * Try: Run with –stacktrace option to get the stack trace. Run with –info or –debug option to get more log output. Run with –scan to get full insights. * Get more help at https:\/\/help.gradle.org BUILD FAILED in 1m 3s Exception: Gradle task assembleDebug failed with […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"ngg_post_thumbnail":0,"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[41],"tags":[],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p5q9Zn-kh","jetpack-related-posts":[{"id":1266,"url":"https:\/\/blog.box.kr\/?p=1266","url_meta":{"origin":1257,"position":0},"title":"QR \ucf54\ub4dc \uc2a4\uce94(QR Code Scan) \ucd08\uac04\ub2e8 \uc608\uc81c(Simple example)","date":"2021-05-18","format":false,"excerpt":"https:\/\/pub.dev\/packages \uc5d0\uc11c qrscan \uac80\uc0c9 AndroidManifest.xml \ud37c\ubbf8\uc158 \ucd94\uac00 \uc704\uce58 : project\/android\/app\/src\/main\/AndroidManifext.xml \uc548\ub4dc\ub85c\uc774\ub4dc\uc758 \uce74\uba54\ub77c\uc640 \uc800\uc7a5\uc18c \uc81c\uc5b4\ub97c \uc704\ud55c \ud37c\ubbf8\uc158\uc744 \ucd94\uac00\ud574 \uc900\ub2e4. \uc2e4\uc81c \uc6b0\ub9ac\uac00 \ud14c\uc2a4\ud2b8\ud558\ub294 \ucf54\ub4dc\uc5d0\ub294 \uad73\uc774 \uc800\uc7a5\uc18c \uad00\ub828\uc740 \ud544\uc694 \uc5c6\uc9c0\ub9cc qrscan \ud328\ud0a4\uc9c0 \ub0b4\uc5d0\uc11c \ubaa8\ub450 \uc0ac\uc6a9\ud558\ub2c8 \uc5b4\uca54 \uc218 \uc5c6\ub2e4.    import 'dart:async'; import 'package:flutter\/material.dart'; import 'package:qrscan\/qrscan.dart' as scanner;\u2026","rel":"","context":"In "flutter"","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1239,"url":"https:\/\/blog.box.kr\/?p=1239","url_meta":{"origin":1257,"position":1},"title":"Flutter \uc0ac\uc6a9 \uc815\ub9ac","date":"2021-05-14","format":false,"excerpt":"OSX, Windows, Linux, Web\uc5d0\uc11c \uc0ac\uc6a9\ud558\uae30 \uc704\ud574\uc11c\ub294 \uac01 \uae30\ub2a5\uc744 \ucf1c\uc918\uc57c\ud568. Flutter\ub85c \ub370\uc2a4\ud06c\ud1b1 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uac1c\ubc1c \uc2dc\uc791\ud558\uae30 \uc77c\ud68c\uc131 \uad6c\uc131 \ubcc0\uacbd\uc73c\ub85c \ub370\uc2a4\ud06c\ud1b1 \uc9c0\uc6d0\uc744 \uad6c\uc131\ud574\uc57c\ud569\ub2c8\ub2e4.$ flutter config --enable-windows-desktop # for the Windows runner$ flutter config --enable-macos-desktop \u00a0 # for the macOS runner$ flutter config --enable-linux-desktop \u00a0 # for the Linux runner \ub370\uc2a4\ud06c\ud1b1 \uc6a9 Flutter\uac00 \ud65c\uc131\ud654\ub418\uc5c8\ub294\uc9c0\u2026","rel":"","context":"In "flutter"","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":899,"url":"https:\/\/blog.box.kr\/?p=899","url_meta":{"origin":1257,"position":2},"title":"Cassandra cpp driver install","date":"2015-06-16","format":false,"excerpt":"http:\/\/datastax.github.io\/cpp-driver\/topics\/building\/ \u00a0 Building Supported Platforms The driver is known to work on CentOS\/RHEL 5\/6\/7, Mac OS X 10.8\/10.9 (Mavericks and Yosemite), Ubuntu 12.04\/14.04 LTS, and Windows 7 SP1. It has been built using GCC 4.1.2+, Clang 3.4+, and MSVC 2010\/2012\/2013. Dependencies Driver CMake libuv (1.x or 0.10.x) OpenSSL (optional) NOTE:\u2026","rel":"","context":"In "\uae30\uc220"","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":953,"url":"https:\/\/blog.box.kr\/?p=953","url_meta":{"origin":1257,"position":3},"title":"How to install openssl on windows with visual studio 2015","date":"2015-08-26","format":false,"excerpt":"cite from\u00a0http:\/\/developer.covenanteyes.com\/building-openssl-for-visual-studio\/ and some edit.. ================================================== \u00a0 You need to install\u2026 Visual Studio 2015 (this will likely work with older versions as well) ActivePerl 1 Latest version of OpenSSL source-code 2\u00a0or $ git clone git:\/\/git.openssl.org\/openssl.git $ cd openssl $ git config core.autocrlf false $ git config core.eol lf $ git\u2026","rel":"","context":"In "\uae30\uc220"","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":883,"url":"https:\/\/blog.box.kr\/?p=883","url_meta":{"origin":1257,"position":4},"title":"how to make debug build on cmake","date":"2015-06-10","format":false,"excerpt":"cmake -DCMAKE_BUILD_TYPE:STRING=Debug \u00a0","rel":"","context":"In "cmake\/make"","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":541,"url":"https:\/\/blog.box.kr\/?p=541","url_meta":{"origin":1257,"position":5},"title":"[\uc624\ub958\ub300\ucc98]Unity3D Android Build Error WIN32 Exception ZipAlign","date":"2015-01-06","format":false,"excerpt":"Unity3D\uc5d0\uc11c Android Build \ud560\ub54c \uc624\ub958..\ub0b4\uc5ed Error building Player: Win32Exception: ApplicationName='...\/...\/...\/...\/adt-bundle-mac-x86_64-20140624\/sdk\/tools\/zipalign', CommandLine='4\"\/...\/...\/...\/...\/Asteroid2(2)\/Temp\/StagingArea\/Package.apk'\". CurrentDirectory='Temp\/StagingArea' \u00a0 \ud574\uacb0\ucc45.. Find your copy of the Android SDK in explorer Go to build-tools and choose a version (e.g.build-tools19.1.0) Copy zipalign.exe Come back out of build-tools Go into tools Paste zipalign.exe","rel":"","context":"In "UNITY3D\/COCOS2D"","img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/blog.box.kr\/index.php?rest_route=\/wp\/v2\/posts\/1257"}],"collection":[{"href":"https:\/\/blog.box.kr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.box.kr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.box.kr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.box.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1257"}],"version-history":[{"count":1,"href":"https:\/\/blog.box.kr\/index.php?rest_route=\/wp\/v2\/posts\/1257\/revisions"}],"predecessor-version":[{"id":1261,"href":"https:\/\/blog.box.kr\/index.php?rest_route=\/wp\/v2\/posts\/1257\/revisions\/1261"}],"wp:attachment":[{"href":"https:\/\/blog.box.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1257"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.box.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1257"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.box.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1257"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}