feat: bluetooth discovery

.gitignore

@@ -27,3 +27,5 @@ migrate_working_dir/
 **/doc/api/
 .dart_tool/
 build/
+
+.vscode

README.md

@@ -1,6 +1,5 @@
 # flutter_zsdk
-
-A new Flutter plugin project.
+Flutter Pluggin for Zebra Multiplatform SDK
 
 ## Getting Started
 
@@ -12,4 +11,3 @@ Android and/or iOS.
 For help getting started with Flutter development, view the
 [online documentation](https://flutter.dev/docs), which offers tutorials,
 samples, guidance on mobile development, and a full API reference.
-

android/build.gradle

@@ -3,6 +3,7 @@ version '1.0'
 
 buildscript {
     repositories {
+        jcenter()
         google()
         mavenCentral()
     }
@@ -14,6 +15,7 @@ buildscript {
 
 rootProject.allprojects {
     repositories {
+        jcenter()
         google()
         mavenCentral()
     }
@@ -35,6 +37,7 @@ android {
 
     defaultConfig {
         minSdkVersion 19
+        multiDexEnabled true
     }
 
     dependencies {
@@ -42,6 +45,11 @@ android {
         testImplementation 'org.mockito:mockito-core:5.0.0'
     }
 
+    lintOptions {
+        abortOnError false
+        checkReleaseBuilds false
+    }
+
     testOptions {
         unitTests.all {
             testLogging {
@@ -51,4 +59,38 @@ android {
             }
         }
     }
+
+    packagingOptions {
+        exclude 'META-INF/LICENSE.txt'
+        exclude 'META-INF/NOTICE.txt'
+        exclude 'META-INF/NOTICE'
+        exclude 'META-INF/LICENSE'
+        exclude 'META-INF/DEPENDENCIES'
+    }
+}
+
+dependencies {
+    implementation files('libs\\commons-io-2.17.0.jar')
+    implementation files('libs\\commons-lang3-3.17.0.jar')
+    implementation files('libs\\commons-net-3.11.1.jar')
+    implementation files('libs\\commons-validator-1.9.0.jar')
+    implementation files('libs\\core-1.58.0.0.jar')
+    implementation files('libs\\httpcore-4.4.16.jar')
+    implementation files('libs\\httpmime-4.5.14.jar')
+    
+    implementation files('libs\\jackson-annotations-2.17.2.jar')
+    implementation files('libs\\jackson-core-2.17.2.jar')
+    implementation files('libs\\jackson-databind-2.17.2.jar')
+
+    // implementation 'com.fasterxml.jackson.core:jackson-annotations:2.13.3' // Downgraded
+    // implementation 'com.fasterxml.jackson.core:jackson-core:2.13.3' // Downgraded
+    // implementation 'com.fasterxml.jackson.core:jackson-databind:2.13.3' // Downgraded
+
+    implementation files('libs\\opencsv-2.3.jar')
+    implementation files('libs\\pkix-1.54.0.0.jar')
+    implementation files('libs\\prov-1.58.0.0.jar')
+    implementation files('libs\\snmp6_1z.jar')
+    implementation files('libs\\ZSDK_ANDROID_API.jar')
+    // implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'androidx.multidex:multidex:2.0.1'
 }

android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.0-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

android/gradlew

@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

android/gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

android/src/main/AndroidManifest.xml

@@ -1,3 +1,8 @@
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-  package="id.kalanusa.flutter_zsdk">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <uses-permission android:name="android.permission.BLUETOOTH"/>
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
+    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
 </manifest>

android/src/main/java/id/kalanusa/flutter_zsdk/FlutterZsdkPlugin.java

@@ -1,34 +1,217 @@
 package id.kalanusa.flutter_zsdk;
 
+import android.Manifest;
+import android.app.Activity;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.os.Build;
+import android.os.Handler;
+
 import androidx.annotation.NonNull;
 
+import com.zebra.sdk.comm.ConnectionException;
+import com.zebra.sdk.printer.discovery.BluetoothDiscoverer;
+import com.zebra.sdk.printer.discovery.DiscoveredPrinter;
+import com.zebra.sdk.printer.discovery.DiscoveryHandler;
+
+import java.util.ArrayList;
+import java.util.Map;
+import java.util.Objects;
+
+import id.kalanusa.flutter_zsdk.bluetoothdiscoveryhandler.BluetoothDiscoveryHandler;
+import id.kalanusa.flutter_zsdk.bluetoothdiscoveryhandler.BluetoothPrinter;
+import io.flutter.Log;
+import io.flutter.embedding.engine.dart.DartExecutor;
 import io.flutter.embedding.engine.plugins.FlutterPlugin;
+import io.flutter.embedding.engine.plugins.activity.ActivityAware;
+import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
+import io.flutter.plugin.common.BinaryMessenger;
+import io.flutter.plugin.common.EventChannel;
 import io.flutter.plugin.common.MethodCall;
 import io.flutter.plugin.common.MethodChannel;
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler;
 import io.flutter.plugin.common.MethodChannel.Result;
+import io.flutter.plugin.common.PluginRegistry;
 
 /** FlutterZsdkPlugin */
-public class FlutterZsdkPlugin implements FlutterPlugin, MethodCallHandler {
+public class FlutterZsdkPlugin implements FlutterPlugin, MethodCallHandler, ActivityAware, PluginRegistry.RequestPermissionsResultListener {
   /// The MethodChannel that will the communication between Flutter and native Android
   ///
   /// This local reference serves to register the plugin with the Flutter Engine and unregister it
   /// when the Flutter Engine is detached from the Activity
   private MethodChannel channel;
+  private Context context;
+  private Activity activity;
+  private ArrayList<BluetoothPrinter> discoveredPrinterList = new ArrayList<BluetoothPrinter>();
+  public static final String bluetoothDiscoveryEventChannel = "id.kalanusa.flutter_zsdk.channel_events/bluetooth_discovery";
+  private EventChannel.EventSink attachEvent;
+  private Handler handler;
+  private DartExecutor dartExecutor;
+  private BinaryMessenger binaryMessenger;
 
   @Override
   public void onAttachedToEngine(@NonNull FlutterPluginBinding flutterPluginBinding) {
     channel = new MethodChannel(flutterPluginBinding.getBinaryMessenger(), "flutter_zsdk");
     channel.setMethodCallHandler(this);
+    context = flutterPluginBinding.getApplicationContext();
+    dartExecutor = Objects.requireNonNull(flutterPluginBinding.getFlutterEngine()).getDartExecutor();
+    binaryMessenger = dartExecutor.getBinaryMessenger();
+
   }
 
   @Override
-  public void onMethodCall(@NonNull MethodCall call, @NonNull Result result) {
+  public void onAttachedToActivity(@NonNull ActivityPluginBinding binding) {
+    activity = binding.getActivity();
+    binding.addRequestPermissionsResultListener(this);
 
+    new EventChannel(binaryMessenger, bluetoothDiscoveryEventChannel).setStreamHandler(new BluetoothDiscoveryHandler(context, activity));
+  }
+
+  @Override
+  public void onDetachedFromActivityForConfigChanges() {
+
+  }
+
+  @Override
+  public void onReattachedToActivityForConfigChanges(@NonNull ActivityPluginBinding binding) {
+
+  }
+
+  @Override
+  public void onDetachedFromActivity() {
+    activity = null;
+  }
+
+  @Override
+  public void onMethodCall(@NonNull MethodCall call, @NonNull Result result) {
+    switch(call.method) {
+      case "findBluetoothPrinters":
+        findBluetoothPrinters();
+      case "getPlatformVersion":
+        Log.w("from native", "TEST");
+    }
   }
 
   @Override
   public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) {
     channel.setMethodCallHandler(null);
   }
+
+  @Override
+  public boolean onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+    if (requestCode == 1001) { // Check if it'sthe request we initiated
+      if (grantResults.length > 0) {
+        boolean bluetoothScanGranted = grantResults[0] == PackageManager.PERMISSION_GRANTED;
+        boolean bluetoothConnectGranted = grantResults[1] == PackageManager.PERMISSION_GRANTED;
+        boolean locationGranted = grantResults[2] == PackageManager.PERMISSION_GRANTED;
+
+        if (bluetoothScanGranted && bluetoothConnectGranted && locationGranted) {
+          // All permissions granted, proceed with Bluetooth operations
+          // ... your Bluetooth code here ...
+          this.startDiscoverBluetoothPrinters();
+        } else {
+          System.out.println("Permission Denied, please allow permission to discover bluetooth devices");
+          // Handle denied permissions
+          // You might display a messageto the user or disable Bluetooth features
+          // ... your logic for handling denied permissions ...
+        }
+      }
+    }
+
+    return true;
+  }
+
+
+//  Bluetooth discovery
+  public void findBluetoothPrinters() {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+      if (context.checkSelfPermission(Manifest.permission.BLUETOOTH_SCAN) != PackageManager.PERMISSION_GRANTED ||
+              context.checkSelfPermission(Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED ||
+              context.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
+
+        activity.requestPermissions(new String[]{
+                Manifest.permission.BLUETOOTH_SCAN,
+                Manifest.permission.BLUETOOTH_CONNECT,
+                Manifest.permission.ACCESS_FINE_LOCATION
+        }, 1001);
+      } else {
+        this.startDiscoverBluetoothPrinters();
+      }
+    } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+      if (context.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
+        activity.requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1002);
+      } else {
+        this.startDiscoverBluetoothPrinters();
+      }
+    }
+  }
+
+  public void startDiscoverBluetoothPrinters() {
+    new EventChannel(dartExecutor, bluetoothDiscoveryEventChannel).setStreamHandler(
+            new EventChannel.StreamHandler() {
+
+              @Override
+              public void onListen(Object arguments, EventChannel.EventSink events) {
+                Log.w("From native", "Adding Listener");
+                attachEvent = events;
+                handler = new Handler();
+                startDiscoverBluetoothPrintersRunnable.run();
+              }
+
+              @Override
+              public void onCancel(Object arguments) {
+                Log.w("From native", "Cancelling Listener");
+                handler.removeCallbacks(startDiscoverBluetoothPrintersRunnable);
+                handler = null;
+                attachEvent = null;
+                System.out.println("StreamHandler - onCanceled: ");              }
+            }
+    );
+  }
+
+//  public void startDiscoverBluetoothPrintersRunnable() {
+//    new Thread(new Runnable() {
+//      @Override
+//      public void run() {
+//
+//    });
+//  }
+//
+  private final Runnable startDiscoverBluetoothPrintersRunnable = new Runnable() {
+    @Override
+    public void run() {
+      ArrayList<BluetoothPrinter> tempDiscoveredPrinterList = new ArrayList<BluetoothPrinter>();
+      DiscoveryHandler discoveryHandler = new DiscoveryHandler() {
+        @Override
+        public void foundPrinter(DiscoveredPrinter discoveredPrinter) {
+          Map<String, String> discoveredPrinterDataMap = discoveredPrinter.getDiscoveryDataMap();
+          System.out.println("Found printer "  + discoveredPrinterDataMap.get("FRIENDLY_NAME"));
+
+          BluetoothPrinter bluetoothPrinter = new BluetoothPrinter(discoveredPrinterDataMap.get("FRIENDLY_NAME"), discoveredPrinterDataMap.get("MAC_ADDRESS"));
+          tempDiscoveredPrinterList.add(bluetoothPrinter);
+          attachEvent.success(tempDiscoveredPrinterList);
+        }
+
+        @Override
+        public void discoveryFinished() {
+          // return value here, this is asynchronous
+          Log.w("From Native", "Discovery Success, found "+ tempDiscoveredPrinterList.size() + " Printer(s)");
+          attachEvent.endOfStream();
+        }
+
+        @Override
+        public void discoveryError(String s) {
+          System.out.println("Error when discovering bluetooth device");
+          System.out.println("message:" + s);
+        }
+      };
+
+      try {
+        BluetoothDiscoverer.findPrinters(context, discoveryHandler);
+      } catch (ConnectionException e) {
+        System.out.println("Error when finding printers");
+//            throw new RuntimeException(e);
+      }
+    }
+  };
 }

android/src/main/java/id/kalanusa/flutter_zsdk/bluetoothdiscoveryhandler/BluetoothDiscoveryHandler.java

@@ -0,0 +1,118 @@
+package id.kalanusa.flutter_zsdk.bluetoothdiscoveryhandler;
+
+import android.app.Activity;
+import android.content.Context;
+
+import com.zebra.sdk.comm.ConnectionException;
+import com.zebra.sdk.printer.discovery.BluetoothDiscoverer;
+import com.zebra.sdk.printer.discovery.DiscoveredPrinter;
+import com.zebra.sdk.printer.discovery.DiscoveryHandler;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import io.flutter.Log;
+import io.flutter.plugin.common.EventChannel;
+
+public class BluetoothDiscoveryHandler implements EventChannel.StreamHandler {
+
+    public BluetoothDiscoveryHandler(Context context, Activity activity) {
+        this.context = context;
+        this.activity = activity;
+    }
+
+    private Context context;
+    private Activity activity;
+    private EventChannel.EventSink eventSink;
+//    ArrayList<BluetoothPrinter> discoveredBluetoothPrinterList = new ArrayList<BluetoothPrinter>();
+    List<Map<String, String>> discoveredBluetoothPrinters = new ArrayList<>();
+
+    @Override
+    public void onListen(Object arguments, EventChannel.EventSink events) {
+        eventSink = events;
+        eventSink.success("SOS");
+
+
+        startDiscoverBluetoothPrinters();
+    }
+
+    @Override
+    public void onCancel(Object arguments) {
+        Log.w("From Native", "Canceling Discovery Bluetooth Subscription");
+        discoveredBluetoothPrinters.clear();
+        eventSink.success("EOS");
+        eventSink = null;
+//        context = null;
+//        activity = null;
+    }
+
+    private void startDiscoverBluetoothPrinters() {
+        new Thread(new Runnable() {
+            @Override
+            public void run() {
+                DiscoveryHandler discoveryHandler = new DiscoveryHandler() {
+                    @Override
+                    public void foundPrinter(DiscoveredPrinter discoveredPrinter) {
+                        Map<String, String> discoveredPrinterDataMap = discoveredPrinter.getDiscoveryDataMap();
+                        Log.w("From Native (Android)","Found printer " + discoveredPrinterDataMap.get("FRIENDLY_NAME"));
+
+                        BluetoothPrinter discoveredBluetoothPrinter = new BluetoothPrinter(discoveredPrinterDataMap.get("FRIENDLY_NAME"), discoveredPrinterDataMap.get("MAC_ADDRESS"));
+                        discoveredBluetoothPrinters.add(discoveredBluetoothPrinter.toMap());
+
+//                        List<Map<String, String>> convertedDiscoveredPinterList = new ArrayList<>();
+//
+//                        for(BluetoothPrinter bluetoothPrinter : discoveredBluetoothPrinterList) {
+//                            convertedDiscoveredPinterList.add(bluetoothPrinter.toMap());
+//                        }
+
+                        activity.runOnUiThread(new Runnable() {
+                            @Override
+                            public void run() {
+                                eventSink.success(discoveredBluetoothPrinters);
+                            }
+                        });
+                    }
+
+                    @Override
+                    public void discoveryFinished() {
+                        Log.w("From Native (Android)", "Bluetooth Discovery Finished");
+
+                        activity.runOnUiThread(new Runnable() {
+                            @Override
+                            public void run() {
+                                eventSink.success(discoveredBluetoothPrinters);
+                                eventSink.success("EOS");
+                            }
+                        });
+                    }
+
+                    @Override
+                    public void discoveryError(String s) {
+                        Log.w("From Native (Android)", "Bluetooth Discovery Error" + s);
+                        activity.runOnUiThread(new Runnable() {
+                            @Override
+                            public void run() {
+                                eventSink.error("DISCOVERY_ERROR", "Something went wrong, message" + s, s);
+                            }
+                        });
+                    }
+                };
+
+                try {
+                    BluetoothDiscoverer.findPrinters(context, discoveryHandler);
+                    Log.w("From Native (Android)", "Bluetooth Discovery Started");
+                } catch (ConnectionException e) {
+                    Log.w("From Native (Android)", "Bluetooth Discovery Error <ConnectionException>");
+                    activity.runOnUiThread(new Runnable() {
+                        @Override
+                        public void run() {
+                            eventSink.error("DISCOVERY_ERROR", "Something went wrong", e);
+                        }
+                    });
+                }
+
+            }
+        }).start();
+    }
+}

android/src/main/java/id/kalanusa/flutter_zsdk/bluetoothdiscoveryhandler/BluetoothPrinter.java

@@ -0,0 +1,22 @@
+package id.kalanusa.flutter_zsdk.bluetoothdiscoveryhandler;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class BluetoothPrinter {
+    String friendlyName = "unknown";
+    String macAddress = "unknown";
+
+    public BluetoothPrinter(String friendlyName, String macAddress) {
+        this.friendlyName = friendlyName;
+        this.macAddress = macAddress;
+    }
+
+    public Map<String, String> toMap() {
+        Map<String, String> map = new HashMap<>();
+        map.put("friendlyName", friendlyName);
+        map.put("macAddress", macAddress);
+
+        return map;
+    }
+}

example/android/app/build.gradle

@@ -37,10 +37,11 @@ android {
         applicationId "id.kalanusa.flutter_zsdk_example"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
-        minSdkVersion flutter.minSdkVersion
+        minSdkVersion 21
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
+        multiDexEnabled true 
     }
 
     buildTypes {
@@ -50,6 +51,22 @@ android {
             signingConfig signingConfigs.debug
         }
     }
+
+    packagingOptions {
+        exclude 'META-INF/LICENSE.txt'
+        exclude 'META-INF/NOTICE.txt'
+        exclude 'META-INF/NOTICE'
+        exclude 'META-INF/LICENSE'
+        exclude 'META-INF/DEPENDENCIES'
+    }
+
+    // lintOptions {
+    //     checkReleaseBuilds false
+    // }
+}
+
+dependencies {
+    implementation("androidx.multidex:multidex:2.0.1") // Add the multidex library
 }
 
 flutter {

example/android/gradle.properties

@@ -1,3 +1,4 @@
 org.gradle.jvmargs=-Xmx4G
 android.useAndroidX=true
 android.enableJetifier=true
+android.jetifier.ignorelist=jackson-core-2.17.2.jar

example/android/gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.0-bin.zip
+networkTimeout=10000
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.6.3-all.zip

example/android/settings.gradle

@@ -19,7 +19,7 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "7.3.0" apply false
+    id "com.android.application" version "8.1.3" apply false
     id "org.jetbrains.kotlin.android" version "1.7.10" apply false
 }
 

example/lib/main.dart

@@ -1,11 +1,16 @@
+import 'dart:developer';
+import 'dart:math';
+
 import 'package:flutter/material.dart';
 import 'dart:async';
 
 import 'package:flutter/services.dart';
 import 'package:flutter_zsdk/flutter_zsdk.dart';
+import 'package:flutter_zsdk/src/models/flutter_zsdk_exception.dart';
+import 'package:flutter_zsdk_example/models/bluetooth_printer.dart';
 
 void main() {
-  runApp(const MyApp());
+  runApp(const MaterialApp(home: MyApp()));
 }
 
 class MyApp extends StatefulWidget {
@@ -16,6 +21,8 @@ class MyApp extends StatefulWidget {
 }
 
 class _MyAppState extends State<MyApp> {
+  bool _isDiscovering = false;
+  List<BluetoothPrinter> _discoveredBluetoothPrinters = [];
   String _platformVersion = 'Unknown';
   final _flutterZsdkPlugin = FlutterZsdk();
 
@@ -47,17 +54,91 @@ class _MyAppState extends State<MyApp> {
     });
   }
 
+  StreamSubscription? _bluetoothPrinterSubscription;
+
+  void showSnackBar(String message) {
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(content: Text(message))
+    );
+  }
+
+  Future<void> discoverBluetoothDevices() async {
+    try {
+      Stream<dynamic> stream = await _flutterZsdkPlugin.findBluetoothPrinters();
+      _bluetoothPrinterSubscription = stream.listen((event) {
+        print(event);
+
+        if (event == 'SOS') {
+          _isDiscovering = true;
+
+        }
+
+        if (event is List) {
+          _discoveredBluetoothPrinters.clear();
+          for (var printer in event) {
+            BluetoothPrinter bluetoothPrinter = BluetoothPrinter.fromMap(printer);
+
+            _discoveredBluetoothPrinters.add(bluetoothPrinter);
+          }
+
+        }
+
+        if (event == 'EOS') {
+          _isDiscovering = false;
+          showSnackBar('Bluetooth discovery finished, found ${_discoveredBluetoothPrinters.length} printers');
+          _bluetoothPrinterSubscription?.cancel();
+        }
+
+        setState(() {});
+      });
+    
+    } on PlatformException catch (e) {
+      inspect(e);
+      showSnackBar(e.message.toString());
+
+    } on FlutterZsdkException catch (e) { 
+      inspect(e);
+      showSnackBar(e.message);
+
+    } catch (e) {
+      inspect(e);
+      showSnackBar('Unexpected error while discovering bluetooth printers');
+
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
-    return MaterialApp(
-      home: Scaffold(
-        appBar: AppBar(
-          title: const Text('Plugin example app'),
-        ),
-        body: Center(
-          child: Text('Running on: $_platformVersion\n'),
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Plugin example app'),
+      ),
+      body: Center(
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.center,
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            Text('Running on: $_platformVersion\n'),
+            SizedBox(height: 20),
+        
+            ElevatedButton(
+              child: Text(_isDiscovering ? 'Discovering bluetooth printers...' : 'Discover nearby bluetooth printers'),
+              onPressed: _isDiscovering ? null : () async {
+                discoverBluetoothDevices();
+              },
+            ),
+            SizedBox(height: 20),
+
+            for (var printer in _discoveredBluetoothPrinters) ... [
+              Text(printer.friendlyName),
+              Text(printer.macAddress),
+              SizedBox(height: 10)
+            ]
+          ] 
+          
         ),
       ),
+
     );
   }
 }

example/lib/models/bluetooth_printer.dart

@@ -0,0 +1,8 @@
+class BluetoothPrinter {
+  String friendlyName;
+  String macAddress;
+
+  BluetoothPrinter(this.friendlyName, this.macAddress);
+
+  BluetoothPrinter.fromMap(Map<Object?, Object?> map) : friendlyName = (map['friendlyName'] as String?) ?? 'unknown', macAddress = (map['macAddress'] as String?) ?? 'unknown';
+}

example/pubspec.lock

@@ -70,6 +70,14 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_blue_plus:
+    dependency: transitive
+    description:
+      name: flutter_blue_plus
+      sha256: d2ac9fac56c4b3b08eb68752380e2d45e64c61db629b70e61bb36c95cb65d431
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.34.5"
   flutter_driver:
     dependency: transitive
     description: flutter
@@ -88,6 +96,11 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_web_plugins:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
   flutter_zsdk:
     dependency: "direct main"
     description:
@@ -169,6 +182,54 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.9.0"
+  permission_handler:
+    dependency: transitive
+    description:
+      name: permission_handler
+      sha256: "18bf33f7fefbd812f37e72091a15575e72d5318854877e0e4035a24ac1113ecb"
+      url: "https://pub.dev"
+    source: hosted
+    version: "11.3.1"
+  permission_handler_android:
+    dependency: transitive
+    description:
+      name: permission_handler_android
+      sha256: "71bbecfee799e65aff7c744761a57e817e73b738fedf62ab7afd5593da21f9f1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "12.0.13"
+  permission_handler_apple:
+    dependency: transitive
+    description:
+      name: permission_handler_apple
+      sha256: e6f6d73b12438ef13e648c4ae56bd106ec60d17e90a59c4545db6781229082a0
+      url: "https://pub.dev"
+    source: hosted
+    version: "9.4.5"
+  permission_handler_html:
+    dependency: transitive
+    description:
+      name: permission_handler_html
+      sha256: "38f000e83355abb3392140f6bc3030660cfaef189e1f87824facb76300b4ff24"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.3+5"
+  permission_handler_platform_interface:
+    dependency: transitive
+    description:
+      name: permission_handler_platform_interface
+      sha256: e9c8eadee926c4532d0305dff94b85bf961f16759c3af791486613152af4b4f9
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.2.3"
+  permission_handler_windows:
+    dependency: transitive
+    description:
+      name: permission_handler_windows
+      sha256: "1a790728016f79a41216d88672dbc5df30e686e811ad4e698bfc51f76ad91f1e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.1"
   platform:
     dependency: transitive
     description:
@@ -270,6 +331,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "13.0.0"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: "97da13628db363c635202ad97068d47c5b8aa555808e7a9411963c533b449b27"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.5.1"
   webdriver:
     dependency: transitive
     description:
@@ -280,4 +349,4 @@ packages:
     version: "3.0.3"
 sdks:
   dart: ">=3.3.1 <4.0.0"
-  flutter: ">=3.3.0"
+  flutter: ">=3.16.0"

example/windows/flutter/generated_plugin_registrant.cc

@@ -7,8 +7,11 @@
 #include "generated_plugin_registrant.h"
 
 #include <flutter_zsdk/flutter_zsdk_plugin_c_api.h>
+#include <permission_handler_windows/permission_handler_windows_plugin.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
   FlutterZsdkPluginCApiRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("FlutterZsdkPluginCApi"));
+  PermissionHandlerWindowsPluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("PermissionHandlerWindowsPlugin"));
 }

example/windows/flutter/generated_plugins.cmake

@@ -4,6 +4,7 @@
 
 list(APPEND FLUTTER_PLUGIN_LIST
   flutter_zsdk
+  permission_handler_windows
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST

lib/flutter_zsdk.dart

@@ -1,8 +1,14 @@
 
-import 'flutter_zsdk_platform_interface.dart';
+import 'package:flutter_zsdk/src/models/bluetooth_printer.dart';
+
+import 'src/flutter_zsdk_platform_interface.dart';
 
 class FlutterZsdk {
   Future<String?> getPlatformVersion() {
     return FlutterZsdkPlatform.instance.getPlatformVersion();
   }
+
+  Future<Stream<dynamic>> findBluetoothPrinters() {
+    return FlutterZsdkPlatform.instance.findBluetoothPrinters();
+  }
 }

lib/flutter_zsdk_method_channel.dart

@@ -1,17 +0,0 @@
-import 'package:flutter/foundation.dart';
-import 'package:flutter/services.dart';
-
-import 'flutter_zsdk_platform_interface.dart';
-
-/// An implementation of [FlutterZsdkPlatform] that uses method channels.
-class MethodChannelFlutterZsdk extends FlutterZsdkPlatform {
-  /// The method channel used to interact with the native platform.
-  @visibleForTesting
-  final methodChannel = const MethodChannel('flutter_zsdk');
-
-  @override
-  Future<String?> getPlatformVersion() async {
-    final version = await methodChannel.invokeMethod<String>('getPlatformVersion');
-    return version;
-  }
-}

lib/src/flutter_zsdk_method_channel.dart

@@ -0,0 +1,84 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_blue_plus/flutter_blue_plus.dart';
+import 'package:flutter_zsdk/src/models/bluetooth_printer.dart';
+import 'package:flutter_zsdk/src/models/flutter_zsdk_exception.dart';
+import 'package:permission_handler/permission_handler.dart';
+
+import 'flutter_zsdk_platform_interface.dart';
+
+/// An implementation of [FlutterZsdkPlatform] that uses method channels.
+class MethodChannelFlutterZsdk extends FlutterZsdkPlatform {
+  static const bluetoothDiscoveryEventChannel = EventChannel('id.kalanusa.flutter_zsdk.channel_events/bluetooth_discovery');
+
+  /// The method channel used to interact with the native platform.
+  @visibleForTesting
+  final methodChannel = const MethodChannel('flutter_zsdk');
+
+  @override
+  Future<String?> getPlatformVersion() async {
+    final version = await methodChannel.invokeMethod<String>('getPlatformVersion');
+    return version;
+  }
+
+  @override
+  Future<Stream<dynamic>> findBluetoothPrinters() async {
+    // methodChannel.invokeMethod("findBluetoothPrinters");
+    // final bluetoothPrinters = await methodChannel.invokeMethod<List<BluetoothPrinter>>('findBluetoothPrinters');
+    // print(bluetoothPrinters);
+    // return bluetoothPrinters ?? [];
+    
+    // StreamSubscription streamSubscription = bluetoothDiscoveryEventChannel.receiveBroadcastStream().listen((event) {
+    //   print(event);
+    // });
+    if (!await FlutterBluePlus.isSupported) {
+      throw FlutterZsdkException("Bluetooth is not supported on this device.");
+    }
+
+
+    if (await FlutterBluePlus.adapterState.first != BluetoothAdapterState.on) {
+      if (Platform.isAndroid) {
+        try {
+          await FlutterBluePlus.turnOn();
+        } on FlutterBluePlusException catch (e) {
+          throw FlutterZsdkException("Failed to turn on bluetooth: ${e.description}");
+        }
+      } else {
+        throw FlutterZsdkException("Bluetooth is not turned on on this device.");
+      }
+    }
+
+    var bluetoothPermissionStatus = await Permission.bluetooth.status;
+    var bluetoothConnectPermissionStatus = await Permission.bluetoothConnect.status;
+    var bluetoothScanPermissionStatus = await Permission.bluetoothScan.status;
+    var locationPermissionStatus = await Permission.location.status;
+
+    if (!bluetoothPermissionStatus.isGranted || !bluetoothConnectPermissionStatus.isGranted || !bluetoothScanPermissionStatus.isGranted || !locationPermissionStatus.isGranted) {
+      Map<Permission, PermissionStatus> permissionStatuses = await [
+        Permission.bluetooth, 
+        Permission.bluetoothConnect, 
+        Permission.bluetoothScan, 
+        Permission.location
+      ].request();
+
+      print(permissionStatuses[Permission.bluetooth]);
+      print(permissionStatuses[Permission.bluetoothConnect]);
+      print(permissionStatuses[Permission.bluetoothScan]);
+      print(permissionStatuses[Permission.location]);
+
+      if (permissionStatuses[Permission.bluetooth] == PermissionStatus.granted && permissionStatuses[Permission.bluetoothConnect] == PermissionStatus.granted && permissionStatuses[Permission.bluetoothScan] == PermissionStatus.granted && permissionStatuses[Permission.location] == PermissionStatus.granted) {
+        return bluetoothDiscoveryEventChannel.receiveBroadcastStream();
+      } else {
+        // throw Exception("Permissions not granted, please allow permission to discover bluetooth printers.");
+        throw FlutterZsdkException("Permissions not granted, please allow permission to discover bluetooth printers.");
+      }
+
+    } else {
+        return bluetoothDiscoveryEventChannel.receiveBroadcastStream();
+    }
+    
+  }
+}

lib/flutter_zsdk_platform_interface.dart

@@ -1,3 +1,4 @@
+import 'package:flutter_zsdk/src/models/bluetooth_printer.dart';
 import 'package:plugin_platform_interface/plugin_platform_interface.dart';
 
 import 'flutter_zsdk_method_channel.dart';
@@ -26,4 +27,8 @@ abstract class FlutterZsdkPlatform extends PlatformInterface {
   Future<String?> getPlatformVersion() {
     throw UnimplementedError('platformVersion() has not been implemented.');
   }
+
+  Future<Stream<dynamic>> findBluetoothPrinters() {
+    throw UnimplementedError('findBluetoothPrinters() has not been implemented.');
+  }
 }

lib/src/models/bluetooth_printer.dart

@@ -0,0 +1,6 @@
+class BluetoothPrinter {
+  String friendlyName;
+  String macAddress;
+
+  BluetoothPrinter(this.friendlyName, this.macAddress);
+}

lib/src/models/flutter_zsdk_exception.dart

@@ -0,0 +1,10 @@
+class FlutterZsdkException implements Exception {
+  String message;
+
+  FlutterZsdkException(this.message);
+
+  @override
+  String toString() {
+    return message;
+  }
+}

pubspec.yaml

@@ -11,6 +11,8 @@ dependencies:
   flutter:
     sdk: flutter
   plugin_platform_interface: ^2.0.2
+  permission_handler: ^11.3.1
+  flutter_blue_plus: ^1.34.5
 
 dev_dependencies:
   flutter_test:

test/flutter_zsdk_method_channel_test.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:flutter_zsdk/flutter_zsdk_method_channel.dart';
+import 'package:flutter_zsdk/src/flutter_zsdk_method_channel.dart';
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();

test/flutter_zsdk_test.dart

@@ -1,7 +1,8 @@
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter_zsdk/flutter_zsdk.dart';
-import 'package:flutter_zsdk/flutter_zsdk_platform_interface.dart';
-import 'package:flutter_zsdk/flutter_zsdk_method_channel.dart';
+import 'package:flutter_zsdk/src/flutter_zsdk_platform_interface.dart';
+import 'package:flutter_zsdk/src/flutter_zsdk_method_channel.dart';
+import 'package:flutter_zsdk/src/models/bluetooth_printer.dart';
 import 'package:plugin_platform_interface/plugin_platform_interface.dart';
 
 class MockFlutterZsdkPlatform
@@ -10,6 +11,9 @@ class MockFlutterZsdkPlatform
 
   @override
   Future<String?> getPlatformVersion() => Future.value('42');
+
+  @override
+  Future<List<BluetoothPrinter>> findBluetoothPrinters() => Future.value([]);
 }
 
 void main() {