diff --git a/cmake/cortex-a53-clang.cmake b/cmake/cortex-a53-clang.cmake
new file mode 100644
index 0000000..e2da7b0
--- /dev/null
+++ b/cmake/cortex-a53-clang.cmake
@@ -0,0 +1,20 @@
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR arm)
+
+set(BUILDROOT_VARIANT "buildroot")
+
+set(CMAKE_SYSROOT $ENV{BUILDROOT_SDK_PATH}/aarch64-${BUILDROOT_VARIANT}-linux-gnu/sysroot)
+
+set(CMAKE_C_COMPILER clang)
+set(CMAKE_CXX_COMPILER clang++)
+
+set(CMAKE_C_FLAGS "--target=aarch64-linux-gnueabihf -mcpu=cortex-a53")
+set(CMAKE_CXX_FLAGS "--target=aarch64-linux-gnueabihf -mcpu=cortex-a53")
+set(CMAKE_EXE_LINKER_FLAGS "-fuse-ld=lld")
+
+set(CMAKE_TRY_COMPILE_TARGET_TYPE "STATIC_LIBRARY")
+
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
\ No newline at end of file
diff --git a/aarch64-buildroot.cmake b/cmake/cortex-a53.cmake
similarity index 100%
rename from aarch64-buildroot.cmake
rename to cmake/cortex-a53.cmake
diff --git a/arm-buildroot.cmake b/cmake/cortex-a7.cmake
similarity index 100%
rename from arm-buildroot.cmake
rename to cmake/cortex-a7.cmake
diff --git a/cmake/cortex-a72-clang.cmake b/cmake/cortex-a72-clang.cmake
new file mode 100644
index 0000000..4e7af54
--- /dev/null
+++ b/cmake/cortex-a72-clang.cmake
@@ -0,0 +1,20 @@
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR arm)
+
+set(BUILDROOT_VARIANT "buildroot")
+
+set(CMAKE_SYSROOT $ENV{BUILDROOT_SDK_PATH}/aarch64-${BUILDROOT_VARIANT}-linux-gnu/sysroot)
+
+set(CMAKE_C_COMPILER clang)
+set(CMAKE_CXX_COMPILER clang++)
+
+set(CMAKE_C_FLAGS "--target=aarch64-linux-gnueabihf -mcpu=cortex-a72")
+set(CMAKE_CXX_FLAGS "--target=aarch64-linux-gnueabihf -mcpu=cortex-a72")
+set(CMAKE_EXE_LINKER_FLAGS "-fuse-ld=lld")
+
+set(CMAKE_TRY_COMPILE_TARGET_TYPE "STATIC_LIBRARY")
+
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
\ No newline at end of file
diff --git a/include/impl/user_mqtt_impl.h b/include/impl/user_mqtt_impl.h
index cadc829..67933de 100644
--- a/include/impl/user_mqtt_impl.h
+++ b/include/impl/user_mqtt_impl.h
@@ -8,6 +8,7 @@
 
 typedef struct {
     struct mosquitto *mosq;
+    char topic[32];
 } user_mqtt_impl_t;
 
 int user_mqtt_impl_init(user_mqtt_impl_t *handle);
diff --git a/include/user_common.h b/include/user_common.h
new file mode 100644
index 0000000..3d24212
--- /dev/null
+++ b/include/user_common.h
@@ -0,0 +1,6 @@
+#ifndef USER_COMMON_H
+#define USER_COMMON_H
+
+#define UNUSED(x) (void)(x)
+
+#endif
\ No newline at end of file
diff --git a/lib/st7789_lcd b/lib/st7789_lcd
index e4ea256..34da074 160000
--- a/lib/st7789_lcd
+++ b/lib/st7789_lcd
@@ -1 +1 @@
-Subproject commit e4ea2560c14255e1525068419fd1206fe395fa5c
+Subproject commit 34da07424c1a6da262cf4e711850c6cfe1b592a1
diff --git a/src/impl/user_bme280_impl.c b/src/impl/user_bme280_impl.c
index e3e53c3..ca18bbe 100644
--- a/src/impl/user_bme280_impl.c
+++ b/src/impl/user_bme280_impl.c
@@ -5,10 +5,9 @@
 #include <errno.h>
 #include <string.h>
 
+#include "user_common.h"
 #include "drivers/user_config_driver.h"
-
 #include "utils/user_log_util.h"
-
 #include "impl/user_bme280_impl.h"
 
 extern user_config_t g_config;
@@ -79,6 +78,7 @@ bme280_ret_t user_bme280_impl_write_register_cb(user_bme280_impl_t *impl,
 }
 
 bme280_ret_t user_bme280_impl_delay_cb(user_bme280_impl_t *impl, uint32_t delay_ms) {
+    UNUSED(impl);
     usleep(delay_ms * 1000);
     return BME_OK;
 }
\ No newline at end of file
diff --git a/src/impl/user_ccs811_impl.c b/src/impl/user_ccs811_impl.c
index bf41e11..031d815 100644
--- a/src/impl/user_ccs811_impl.c
+++ b/src/impl/user_ccs811_impl.c
@@ -6,10 +6,9 @@
 #include <errno.h>
 #include <string.h>
 
+#include "user_common.h"
 #include "drivers/user_config_driver.h"
-
 #include "utils/user_log_util.h"
-
 #include "impl/user_ccs811_impl.h"
 
 extern user_config_t g_config;
@@ -83,6 +82,7 @@ int user_ccs811_impl_deinit(user_ccs811_impl_t *impl) {
 }
 
 ccs811_ret_t user_ccs811_impl_delay_ms_cb(user_ccs811_impl_t *impl, uint32_t delay_ms) {
+    UNUSED(impl);
     usleep(delay_ms * 1000);
     return CCS_OK;
 }
diff --git a/src/impl/user_lvgl_impl.c b/src/impl/user_lvgl_impl.c
index b19ff92..2804a4c 100644
--- a/src/impl/user_lvgl_impl.c
+++ b/src/impl/user_lvgl_impl.c
@@ -2,12 +2,11 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
+#include "user_common.h"
 #include "drivers/user_config_driver.h"
-
 #include "impl/user_lvgl_impl.h"
 #include "impl/user_st7789_impl.h"
 #include "impl/user_stick_impl.h"
-
 #include "utils/user_log_util.h"
 
 extern user_config_t g_config;
@@ -68,6 +67,8 @@ void user_lvgl_impl_flush_cb(lv_disp_drv_t *disp_drv, const lv_area_t *area,
 }
 
 void user_lvgl_impl_indev_read_cb(lv_indev_drv_t *drv, lv_indev_data_t *data) {
+    UNUSED(drv);
+
     user_stick_key_t key = user_stick_impl_read(&g_stick_impl);
     user_stick_key_t key_to_determine = USER_STICK_NONE;
     if(key != s_previous_key) {                 // Key state changed
@@ -110,6 +111,8 @@ void user_lvgl_impl_log_cb(const char *buf) {
 
 void *user_lvgl_impl_fs_open_cb(lv_fs_drv_t *drv, const char *path,
                                 lv_fs_mode_t mode) {
+    UNUSED(drv);
+
     char canonical_path[256];
     char *fs_base_dir =
         user_config_lookup_string(&g_config, "agent.libraries.lvgl.fs_base");
@@ -136,6 +139,8 @@ void *user_lvgl_impl_fs_open_cb(lv_fs_drv_t *drv, const char *path,
 }
 
 lv_fs_res_t user_lvgl_impl_fs_close_cb(lv_fs_drv_t *drv, void *file_p) {
+    UNUSED(drv);
+
     int fd = *(int *)file_p;
 
     if(fd > 0) {
@@ -154,6 +159,8 @@ lv_fs_res_t user_lvgl_impl_fs_close_cb(lv_fs_drv_t *drv, void *file_p) {
 
 lv_fs_res_t user_lvgl_impl_fs_read_cb(lv_fs_drv_t *drv, void *file_p, void *buf,
                                       uint32_t btr, uint32_t *br) {
+    UNUSED(drv);
+
     int fd = *(int *)file_p;
 
     if(fd > 0) {
@@ -172,6 +179,8 @@ lv_fs_res_t user_lvgl_impl_fs_read_cb(lv_fs_drv_t *drv, void *file_p, void *buf,
 lv_fs_res_t user_lvgl_impl_fs_write_cb(lv_fs_drv_t *drv, void *file_p,
                                        const void *buf, uint32_t btw,
                                        uint32_t *bw) {
+    UNUSED(drv);
+
     int fd = *(int *)file_p;
 
     if(fd > 0) {
@@ -185,6 +194,8 @@ lv_fs_res_t user_lvgl_impl_fs_write_cb(lv_fs_drv_t *drv, void *file_p,
 
 lv_fs_res_t user_lvgl_impl_fs_seek_cb(lv_fs_drv_t *drv, void *file_p,
                                       uint32_t pos, lv_fs_whence_t whence) {
+    UNUSED(drv);
+
     int fd = *(int *)file_p;
 
     int l_whence = SEEK_SET;
@@ -215,6 +226,8 @@ lv_fs_res_t user_lvgl_impl_fs_seek_cb(lv_fs_drv_t *drv, void *file_p,
 
 lv_fs_res_t user_lvgl_impl_fs_tell_cb(lv_fs_drv_t *drv, void *file_p,
                                       uint32_t *pos_p) {
+    UNUSED(drv);
+
     int fd = *(int *)file_p;
 
     if(fd > 0) {
diff --git a/src/impl/user_mqtt_impl.c b/src/impl/user_mqtt_impl.c
index 98d23c7..66cea44 100644
--- a/src/impl/user_mqtt_impl.c
+++ b/src/impl/user_mqtt_impl.c
@@ -1,9 +1,10 @@
 #include <stdio.h>
 #include <string.h>
 #include <time.h>
+#include <errno.h>
 
+#include "user_common.h"
 #include "impl/user_mqtt_impl.h"
-
 #include "utils/user_log_util.h"
 
 // TODO: Add callbacks here as static functions.
@@ -16,12 +17,21 @@ int user_mqtt_impl_init(user_mqtt_impl_t *handle) {
     USER_LOG(USER_LOG_INFO, "libmosquitto library version %d.%d rev. %d.", mosq_major, mosq_minor, mosq_revision);
 
     // Init mosquitto instance.
-    //handle->mosq = mosquitto_new();
+    handle->mosq = mosquitto_new("ID", false, handle);
+    if(handle->mosq == NULL) {
+        int err = errno;
+        USER_LOG(USER_LOG_ERROR, "mosquitto client creation failed, reason: (%s).", strerror(err));
+        return -1;
+    }
+
+    // Enable multi-thread support.
+    mosquitto_threaded_set(handle->mosq, true);
 
     return 0;
 }
 
 int user_mqtt_impl_deinit(user_mqtt_impl_t *handle) {
+    mosquitto_destroy(handle->mosq);
     mosquitto_lib_cleanup();
 
     return 0;
@@ -32,6 +42,7 @@ int user_mqtt_network_loop(user_mqtt_impl_t *handle) {
 }
 
 mqtt_influx_ret_t user_mqtt_get_nsec_timestamp_cb(user_mqtt_impl_t *handle, char *timestamp_string) {
+    UNUSED(handle);
     struct timespec ts;
     clock_gettime(CLOCK_REALTIME, &ts);
     uint64_t ts_int = ts.tv_sec * 1e9 + ts.tv_nsec;
@@ -42,5 +53,8 @@ mqtt_influx_ret_t user_mqtt_get_nsec_timestamp_cb(user_mqtt_impl_t *handle, char
 mqtt_influx_ret_t user_mqtt_publish_message_cb(user_mqtt_impl_t *handle, char *data) {
     USER_LOG(USER_LOG_DEBUG, "MQTT message: %s", data);
 
+    // TODO: Exception handling required.
+    mosquitto_publish(handle->mosq, NULL, handle->topic, strlen(data), data, 1, false);
+
     return MQTT_INFLUX_OK;
 }
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index 79c9ae9..e9de1e8 100644
--- a/src/main.c
+++ b/src/main.c
@@ -6,6 +6,7 @@
 #include <signal.h>
 #include <string.h>
 
+#include "user_common.h"
 #include "drivers/user_config_driver.h"
 #include "drivers/user_spi_driver.h"
 #include "utils/user_log_util.h"
@@ -25,6 +26,9 @@ static void signal_handler(int signo) {
 }
 
 int main(int argc, const char *argv[]) {
+    UNUSED(argc);
+    UNUSED(argv);
+
     USER_LOG(USER_LOG_INFO, "Application started.");
 
     int signal_arr[] = { SIGINT, SIGTERM };
diff --git a/src/tasks/user_base_task.c b/src/tasks/user_base_task.c
index 9c74c90..c5d5c35 100644
--- a/src/tasks/user_base_task.c
+++ b/src/tasks/user_base_task.c
@@ -1,3 +1,4 @@
+#include "user_common.h"
 #include "tasks/user_task_lvgl_common.h"
 
 pthread_t user_base_task_thread;
@@ -40,6 +41,8 @@ static void event_handler(lv_event_t * e)
 }
 
 void *user_base_task(void *arguments) {
+    UNUSED(arguments);
+
     while(g_running && !g_lvgl_ready) {
         sleep(1);
     }
diff --git a/src/tasks/user_clock_task.c b/src/tasks/user_clock_task.c
index 00408a9..066c020 100644
--- a/src/tasks/user_clock_task.c
+++ b/src/tasks/user_clock_task.c
@@ -1,5 +1,6 @@
 #include <stdint.h>
 
+#include "user_common.h"
 #include "tasks/user_task_lvgl_common.h"
 
 pthread_t user_clock_task_thread;
@@ -32,6 +33,8 @@ int user_clock_task_deinit(void) {
 }
 
 void *user_clock_task(void *arguments) {
+    UNUSED(arguments);
+
     while(g_running && !g_lvgl_ready) {
         sleep(1);
     }
diff --git a/src/tasks/user_dht_task.c b/src/tasks/user_dht_task.c
index c6bf0e3..62c0814 100644
--- a/src/tasks/user_dht_task.c
+++ b/src/tasks/user_dht_task.c
@@ -1,5 +1,6 @@
 #include <stdint.h>
 
+#include "user_common.h"
 #include "impl/user_bme280_impl.h"
 #include "tasks/user_task_lvgl_common.h"
 #include "tasks/user_task_mqtt_common.h"
@@ -25,6 +26,8 @@ int user_dht_task_deinit(void) {
 }
 
 void *user_dht_task(void *arguments) {
+    UNUSED(arguments);
+
     while(g_running && !g_lvgl_ready) {
         sleep(1);
     }
diff --git a/src/tasks/user_lvgl_task.c b/src/tasks/user_lvgl_task.c
index ad7b97f..5f04fac 100644
--- a/src/tasks/user_lvgl_task.c
+++ b/src/tasks/user_lvgl_task.c
@@ -1,5 +1,5 @@
+#include "user_common.h"
 #include "tasks/user_task_lvgl_common.h"
-
 #include "impl/user_lvgl_impl.h"
 
 #define PIXBUF_SIZE 320 * 20
@@ -92,6 +92,7 @@ int user_lvgl_task_deinit(void) {
 }
 
 void *user_lv_task(void *arguments) {
+    UNUSED(arguments);
 
     while(g_running) {
         usleep(30 * 1000);
@@ -104,6 +105,8 @@ void *user_lv_task(void *arguments) {
 }
 
 void *user_lv_tick(void *arguments) {
+    UNUSED(arguments);
+
     while(g_running) {
         usleep(30 * 1000);
         pthread_mutex_lock(&g_lvgl_mutex);
diff --git a/src/tasks/user_mqtt_task.c b/src/tasks/user_mqtt_task.c
index 018a8ea..8a50e74 100644
--- a/src/tasks/user_mqtt_task.c
+++ b/src/tasks/user_mqtt_task.c
@@ -1,5 +1,5 @@
+#include "user_common.h"
 #include "tasks/user_task_lvgl_common.h"
-
 #include "impl/user_mqtt_impl.h"
 
 static user_mqtt_impl_t s_mqtt_impl;
@@ -41,6 +41,8 @@ int user_mqtt_task_deinit(void) {
 }
 
 void *user_mqtt_task(void *arguments) {
+    UNUSED(arguments);
+
     user_mqtt_impl_init(&s_mqtt_impl);
     mqtt_influx_init(&g_mqtt_influx);
 
diff --git a/src/tasks/user_tvoc_task.c b/src/tasks/user_tvoc_task.c
index 3123747..9bf84c2 100644
--- a/src/tasks/user_tvoc_task.c
+++ b/src/tasks/user_tvoc_task.c
@@ -1,7 +1,7 @@
 #include <stdint.h>
 
+#include "user_common.h"
 #include "impl/user_ccs811_impl.h"
-
 #include "tasks/user_task_lvgl_common.h"
 
 void *user_tvoc_task(void *arguments);
@@ -25,6 +25,7 @@ int user_tvoc_task_deinit(void) {
 }
 
 void *user_tvoc_task(void *arguments) {
+    UNUSED(arguments);
 
     user_ccs811_impl_t impl;
 
diff --git a/src/utils/user_system_util.c b/src/utils/user_system_util.c
index cd9f72a..d461a86 100644
--- a/src/utils/user_system_util.c
+++ b/src/utils/user_system_util.c
@@ -15,4 +15,4 @@ int user_system_get_systemd_unique_id(char *uuid) {
     close(machid_fd);
 
     return 0;
-}
\ No newline at end of file
+}