Sample scan shows no devices

[martinvieites]

When trying to execute the sample provided scan shows no results.

The following debug log shows when starting the application:

2025/07/15 12:20:46.733 22379 22424 Warn Unity {
2025/07/15 12:20:46.733 22379 22424 Warn Unity     "device": "",
2025/07/15 12:20:46.733 22379 22424 Warn Unity     "name": "",
2025/07/15 12:20:46.733 22379 22424 Warn Unity     "service": "",
2025/07/15 12:20:46.733 22379 22424 Warn Unity     "characteristic": "",
2025/07/15 12:20:46.733 22379 22424 Warn Unity     "command": "Initialized",
2025/07/15 12:20:46.733 22379 22424 Warn Unity     "hasError": false,
2025/07/15 12:20:46.733 22379 22424 Warn Unity     "errorMessage": "",
2025/07/15 12:20:46.733 22379 22424 Warn Unity     "base64Message": ""
2025/07/15 12:20:46.733 22379 22424 Warn Unity }
2025/07/15 12:20:46.733 22379 22424 Warn Unity  #0 0xc7ca8cbf (libunity.so) PlatformStacktrace::GetStacktrace(int) 0x22
2025/07/15 12:20:46.733 22379 22424 Warn Unity  #1 0xc7ce8aa7 (libunity.so) Stacktrace::GetStacktrace(int) 0x2
2025/07/15 12:20:46.733 22379 22424 Warn Unity  #2 0xc8363e51 (libunity.so) DebugStringToFile(DebugStringToFileData const&) 0x194
2025/07/15 12:20:46.733 22379 22424 Warn Unity  #3 0xc78f9963 (libunity.so) DebugLogHandler::Internal_Log(LogType, LogOption, core::basic_string<char, core::StringStorageDefault<char>> const&, Object*) 0x6a
2025/07/15 12:20:46.733 22379 22424 Warn Unity  #4 0xc78f98cb (libunity.so) DebugLogHandler_CUSTOM_Internal_Log(LogType, LogOption, BindingsManagedSpan*, void*) 0x3a
2025/07/15 12:20:46.733 22379 22424 Warn Unity  #5 0xc6d594fc (libil2cpp.so) ? 0x0
2025/07/15 12:20:46.733 22379 22424 Warn Unity  #6 0xc6d5971c (libil2cpp.so) ? 0x0
2025/07/15 12:20:46.733 22379 22424 Warn Unity  #7 0xc6d88c80 (libil2cpp.so) ? 0x0
2025/07/15 12:20:46.733 22379 22424 Warn Unity  #8 0xc714a928 (libil2cpp.so) ? 0x0
2025/07/15 12:20:46.733 22379 22424 Warn Unity  #9 0xc714ac30 (libil2cpp.so) ? 0x0
2025/07/15 12:20:46.733 22379 22424 Warn Unity  #10 0xc7149c60 (libil2cpp.so) ? 0x0
2025/07/15 12:20:46.733 22379 22424 Warn Unity  #11 0xc4cf9ba8 (libil2cpp.so) ? 0x0
2025/07/15 12:20:46.733 22379 22424 Warn Unity  #12 0xc4cf9af4 (libil2cpp.so) ? 0x0
2025/07/15 12:20:46.733 22379 22424 Warn Unity  #13 0xc7bda5c5 (libunity.so) scripting_method_in

When pressing the scan button something similar happens.

2025/07/15 12:23:43.985 22379 22424 Warn Unity Queueing Command: DiscoverDevices
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #0 0xc7ca8cbf (libunity.so) PlatformStacktrace::GetStacktrace(int) 0x22
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #1 0xc7ce8aa7 (libunity.so) Stacktrace::GetStacktrace(int) 0x2
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #2 0xc8363e51 (libunity.so) DebugStringToFile(DebugStringToFileData const&) 0x194
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #3 0xc78f9963 (libunity.so) DebugLogHandler::Internal_Log(LogType, LogOption, core::basic_string<char, core::StringStorageDefault<char>> const&, Object*) 0x6a
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #4 0xc78f98cb (libunity.so) DebugLogHandler_CUSTOM_Internal_Log(LogType, LogOption, BindingsManagedSpan*, void*) 0x3a
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #5 0xc6d594fc (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #6 0xc6d5971c (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #7 0xc6d88c80 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #8 0xc714a928 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #9 0xc714af54 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #10 0xc6db9eb4 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #11 0xc71496f0 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #12 0xc6d9f98c (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #13 0xc4cf9ba8 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #14 0xc4cf9af4 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.985 22379 22424 Warn Unity  #15 0xc7bda5c5 (libunity.so) scripting_method_invoke(ScriptingMethodPtr, ScriptingObjectPtr, ScriptingArguments&, ScriptingE
2025/07/15 12:23:43.986 22379 22424 Warn Unity Calling Command: scanBleDevices
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #0 0xc7ca8cbf (libunity.so) PlatformStacktrace::GetStacktrace(int) 0x22
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #1 0xc7ce8aa7 (libunity.so) Stacktrace::GetStacktrace(int) 0x2
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #2 0xc8363e51 (libunity.so) DebugStringToFile(DebugStringToFileData const&) 0x194
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #3 0xc78f9963 (libunity.so) DebugLogHandler::Internal_Log(LogType, LogOption, core::basic_string<char, core::StringStorageDefault<char>> const&, Object*) 0x6a
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #4 0xc78f98cb (libunity.so) DebugLogHandler_CUSTOM_Internal_Log(LogType, LogOption, BindingsManagedSpan*, void*) 0x3a
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #5 0xc6d594fc (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #6 0xc6d5971c (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #7 0xc6d88c80 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #8 0xc714a928 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #9 0xc714b250 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #10 0xc714c754 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #11 0xc6db9eb4 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #12 0xc71496f0 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #13 0xc6d9f98c (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #14 0xc4cf9ba8 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #15 0xc4cf9af4 (libil2cpp.so) ? 0x0
2025/07/15 12:23:43.986 22379 22424 Warn Unity  #16 0xc7bda5c5 (libunity.so) scripting_method_invoke(ScriptingMethodPtr, ScriptingObjectP
2025/07/15 12:23:54.042 22379 22424 Warn Unity {
2025/07/15 12:23:54.042 22379 22424 Warn Unity     "device": "",
2025/07/15 12:23:54.042 22379 22424 Warn Unity     "name": "",
2025/07/15 12:23:54.042 22379 22424 Warn Unity     "service": "",
2025/07/15 12:23:54.042 22379 22424 Warn Unity     "characteristic": "",
2025/07/15 12:23:54.042 22379 22424 Warn Unity     "command": "FinishedDiscovering",
2025/07/15 12:23:54.042 22379 22424 Warn Unity     "hasError": false,
2025/07/15 12:23:54.042 22379 22424 Warn Unity     "errorMessage": "",
2025/07/15 12:23:54.042 22379 22424 Warn Unity     "base64Message": ""
2025/07/15 12:23:54.042 22379 22424 Warn Unity }
2025/07/15 12:23:54.042 22379 22424 Warn Unity  #0 0xc7ca8cbf (libunity.so) PlatformStacktrace::GetStacktrace(int) 0x22
2025/07/15 12:23:54.042 22379 22424 Warn Unity  #1 0xc7ce8aa7 (libunity.so) Stacktrace::GetStacktrace(int) 0x2
2025/07/15 12:23:54.042 22379 22424 Warn Unity  #2 0xc8363e51 (libunity.so) DebugStringToFile(DebugStringToFileData const&) 0x194
2025/07/15 12:23:54.042 22379 22424 Warn Unity  #3 0xc78f9963 (libunity.so) DebugLogHandler::Internal_Log(LogType, LogOption, core::basic_string<char, core::StringStorageDefault<char>> const&, Object*) 0x6a
2025/07/15 12:23:54.042 22379 22424 Warn Unity  #4 0xc78f98cb (libunity.so) DebugLogHandler_CUSTOM_Internal_Log(LogType, LogOption, BindingsManagedSpan*, void*) 0x3a
2025/07/15 12:23:54.042 22379 22424 Warn Unity  #5 0xc6d594fc (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.042 22379 22424 Warn Unity  #6 0xc6d5971c (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.042 22379 22424 Warn Unity  #7 0xc6d88c80 (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.042 22379 22424 Warn Unity  #8 0xc714a928 (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.042 22379 22424 Warn Unity  #9 0xc714ac30 (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.042 22379 22424 Warn Unity  #10 0xc7149c60 (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.042 22379 22424 Warn Unity  #11 0xc4cf9ba8 (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.042 22379 22424 Warn Unity  #12 0xc4cf9af4 (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.042 22379 22424 Warn Unity  #13 0xc7bda5c5 (libunity.so) scripting_m
2025/07/15 12:23:54.043 22379 22424 Warn Unity Calling Command: stopScanBleDevices
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #0 0xc7ca8cbf (libunity.so) PlatformStacktrace::GetStacktrace(int) 0x22
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #1 0xc7ce8aa7 (libunity.so) Stacktrace::GetStacktrace(int) 0x2
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #2 0xc8363e51 (libunity.so) DebugStringToFile(DebugStringToFileData const&) 0x194
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #3 0xc78f9963 (libunity.so) DebugLogHandler::Internal_Log(LogType, LogOption, core::basic_string<char, core::StringStorageDefault<char>> const&, Object*) 0x6a
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #4 0xc78f98cb (libunity.so) DebugLogHandler_CUSTOM_Internal_Log(LogType, LogOption, BindingsManagedSpan*, void*) 0x3a
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #5 0xc6d594fc (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #6 0xc6d5971c (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #7 0xc6d88c80 (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #8 0xc714a928 (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #9 0xc714b250 (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #10 0xc714ae40 (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #11 0xc7149c60 (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #12 0xc4cf9ba8 (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #13 0xc4cf9af4 (libil2cpp.so) ? 0x0
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #14 0xc7bda5c5 (libunity.so) scripting_method_invoke(ScriptingMethodPtr, ScriptingObjectPtr, ScriptingArguments&, ScriptingExceptionPtr*, bool) 0x54
2025/07/15 12:23:54.043 22379 22424 Warn Unity  #15 0xc7b

I tested on two devices, one running Android 16 and one running Android 13, same problem on both.

[paulhayes]

There could be a few causes of this

• Have you used the wizard to check the permissions in your Android Manifest?
• Make sure you haven't paired with the device already, and that the device is advertising.

[martinvieites]

Wizard shows everything check

<?xml version="1.0" encoding="utf-8"?>
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.unity3d.player"
    xmlns:tools="http://schemas.android.com/tools">
    <application>
        <activity android:name="com.unity3d.player.UnityPlayerActivity"
                  android:theme="@style/UnityThemeSelector">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

    <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" />
</manifest>

The devices is advertising, at least it show like that on nRF Connect.

[paulhayes]

A damn, this looks unfamiliar to me.

I suggest you use android logcat but don't filter for Unity, and look for OS level messages concerning BLE.

Are you getting the runtime prompt the first time you start the app, or when you press scan, asking you for app permissions?