Disable custom MQTT Outbox. This also moves the MQTT Publishing memory usage back to the internal RAM!

code/sdkconfig.defaults

@@ -123,7 +123,7 @@ CONFIG_MQTT_TASK_CORE_SELECTION_ENABLED=y
 CONFIG_MQTT_USE_CORE_0=y
 CONFIG_MQTT_USE_CUSTOM_CONFIG=y
 #CONFIG_MQTT_OUTBOX_EXPIRED_TIMEOUT_MS=5000
-CONFIG_MQTT_CUSTOM_OUTBOX=y
+#CONFIG_MQTT_CUSTOM_OUTBOX=y # -> Use custom outbox in components/jomjol_mqtt/mqtt_outbox.h/cpp. If USE_PSRAM is enabled in there, it will save 10 kBytes of internal RAM.
 
 CONFIG_FREERTOS_TASK_FUNCTION_WRAPPER=n