17:08:41: Debugging  ...
I libc    : SetHeapTaggingLevel: tag level set to 0
I t.example.Exis: Not late-enabling -Xcheck:jni (already on)
I t.example.Exis: Unquickening 12 vdex files!
W ActivityThread: Application org.qtproject.example.Exist is waiting for the debugger on port 8100...
I System.out: Sending WAIT chunk
Could not load shared library symbols for 261 libraries, e.g. /system/lib64/libandroid_runtime.so.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?Could not load shared library symbols for /apex/com.android.art/lib64/libopenjdkjvmti.so.
Do you need "set solib-search-path" or "set sysroot"?Could not load shared library symbols for /apex/com.android.art/lib64/libart-dexlayout.so.
Do you need "set solib-search-path" or "set sysroot"?Could not load shared library symbols for /apex/com.android.art/lib64/libjdwp.so.
Do you need "set solib-search-path" or "set sysroot"?Could not load shared library symbols for /apex/com.android.art/lib64/libnpt.so.
Do you need "set solib-search-path" or "set sysroot"?Could not load shared library symbols for /apex/com.android.art/lib64/libdt_fd_forward.so.
Do you need "set solib-search-path" or "set sysroot"?I System.out: Debugger has connected
I System.out: waiting for debugger to settle...
I chatty  : uid=10152(org.qtproject.example.Exist) identical 6 lines
I System.out: waiting for debugger to settle...
Could not load shared library symbols for /vendor/lib64/egl/libEGL_emulation.so.
Do you need "set solib-search-path" or "set sysroot"?Could not load shared library symbols for /vendor/lib64/egl/libGLESv1_CM_emulation.so.
Do you need "set solib-search-path" or "set sysroot"?Could not load shared library symbols for /vendor/lib64/egl/libGLESv2_emulation.so.
Do you need "set solib-search-path" or "set sysroot"?Could not load shared library symbols for /data/app/~~0uZaOP_dNdgEZsPBaa9pkA==/org.qtproject.example.Exist-Dp07YsNnbhlqyleJv1jocA==/lib/arm64/libc++_shared.so.
Do you need "set solib-search-path" or "set sysroot"?I System.out: debugger has settled (1431)
D ApplicationLoaders: Returning zygote-cached class loader: /system/framework/android.test.base.jar
D NetworkSecurityConfig: No Network Security Config specified, using platform default
D NetworkSecurityConfig: No Network Security Config specified, using platform default
D libEGL  : loaded /vendor/lib64/egl/libEGL_emulation.so
D libEGL  : loaded /vendor/lib64/egl/libGLESv1_CM_emulation.so
D libEGL  : loaded /vendor/lib64/egl/libGLESv2_emulation.so
W System  : ClassLoader referenced unknown path:
I QtCore  : Start
I Qt      : qt started
D HostConnection: HostConnection::get() New Host Connection established 0x7ce7f3d2d0, tid 7278
D HostConnection: HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_native_sync_v4 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_vulkan ANDROID_EMU_deferred_vulkan_commands ANDROID_EMU_vulkan_null_optional_strings ANDROID_EMU_vulkan_create_resources_with_requirements ANDROID_EMU_YUV_Cache ANDROID_EMU_async_unmap_buffer ANDROID_EMU_vulkan_ignored_handles ANDROID_EMU_vulkan_free_memory_sync ANDROID_EMU_vulkan_shader_float16_int8 ANDROID_EMU_vulkan_async_queue_submit GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_host_side_tracing ANDROID_EMU_async_frame_commands ANDROID_EMU_gles_max_version_3_0
W OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
D EGL_emulation: eglCreateContext: 0x7cd7f5fac0: maj 3 min 0 rcv 3
D EGL_emulation: eglMakeCurrent: 0x7cd7f5fac0: ver 3 0 (tinfo 0x7c78113310) (first time)
I Gralloc4: mapper 4.x is not supported
D HostConnection: createUnique: call
D HostConnection: HostConnection::get() New Host Connection established 0x7ce7f3c0d0, tid 7278
D goldfish-address-space: allocate: Ask for block of size 0x100

D goldfish-address-space: allocate: ioctl allocate returned offset 0x1feb54000 size 0x8000
D HostConnection: HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_native_sync_v4 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_vulkan ANDROID_EMU_deferred_vulkan_commands ANDROID_EMU_vulkan_null_optional_strings ANDROID_EMU_vulkan_create_resources_with_requirements ANDROID_EMU_YUV_Cache ANDROID_EMU_async_unmap_buffer ANDROID_EMU_vulkan_ignored_handles ANDROID_EMU_vulkan_free_memory_sync ANDROID_EMU_vulkan_shader_float16_int8 ANDROID_EMU_vulkan_async_queue_submit GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_host_side_tracing ANDROID_EMU_async_frame_commands ANDROID_EMU_gles_max_version_3_0
D Exist   : true in file ../frontend/mainwindow.cpp line 29 function MainWindow::MainWindow(QWidget *)
D Exist   : true in file ../frontend/mainwindow.cpp line 31 function MainWindow::MainWindow(QWidget *)
D Exist   : true in file ../frontend/mainwindow.cpp line 33 function MainWindow::MainWindow(QWidget *)
17:09:17: Debugging of  has finished with exit code 0.
17:09:17: 

«org.qtproject.example.Exist» аварийно завершился.

void callback_1(...){
  ...
}

void callback_2(...){
  ...
}

void test(){

 mosq_1 = mosquitto_new(null, 1, null);
 mosq_2 = mosquito_new(null,1, null);
 mosquitto_connect(mosq_1, localhost, 1883, 60);
 mosquitto_connect(mosq_2, localhost, 1883,60);
 mosquitto_subscribe(mosq_1,...);
 mosquitto_subscribe(mosq_2,...);
 mosquitto_message_callback_set(mosq_1,callback_1);
 mosquitto_message_callback_set(mosq_2, callback_2);
}