Reduce stack

README.md

@@ -186,12 +186,12 @@ ESP32 devices have a limited amount of free RAM available.<br>
 <br>
 On version >=9.10 of Nuki Hub with only a Nuki Lock connected the expected free amount of RAM/Heap available is around:
 
-- ESP32: 40.000 bytes
-- ESP32 with PSRAM: 90.000 bytes + PSRAM
-- ESP32-C3: 45.000 bytes
-- ESP32-C6: 170.000 bytes
-- ESP32-S3 90.000 bytes
-- ESP32-S3 with PSRAM: 130.000 bytes + PSRAM
+- ESP32: 70.000 bytes
+- ESP32 with PSRAM: 110.000 bytes + PSRAM
+- ESP32-C3: 90.000 bytes
+- ESP32-C6: 200.000 bytes
+- ESP32-S3 130.000 bytes
+- ESP32-S3 with PSRAM: 180.000 bytes + PSRAM
 
 This free amount of RAM can be reduced (temporarily) by certain actions (such as changing Nuki device config) or continuously when enabling the following:
 - Connecting both a Nuki opener and a Nuki lock to Nuki Hub
@@ -709,7 +709,7 @@ Please follow the instructions for the [First time installation](#first-time-ins
 ## MQTT Encryption (optional)
 
 The communication via MQTT can be SSL encrypted.<br>
-Note: MQTT SSL requires a significant amount of RAM and will not work in most cases on low RAM devices (ESP32 without PSRAM or ESP32-C3)
+Note: MQTT SSL requires a significant amount of RAM and might not work on low RAM devices (ESP32 without PSRAM or ESP32-C3)
 
 To enable SSL encryption, supply the necessary information in the MQTT Configuration page.<br>
 <br>

platformio.ini

@@ -44,13 +44,6 @@ build_flags =
     -DNUKI_MUTEX_RECURSIVE
     -DNUKI_64BIT_TIME
     -DETH_SPI_SUPPORTS_NO_IRQ   
-    -DEMC_RX_BUFFER_SIZE=1440
-    -DEMC_TX_BUFFER_SIZE=1440
-    -DEMC_MIN_FREE_MEMORY=8192
-    -DEMC_TASK_STACK_SIZE=10240
-    -DEMC_USE_MEMPOOL=1
-    -DEMC_NUM_POOL_ELEMENTS=64
-    -DEMC_SIZE_POOL_ELEMENTS=256    
     -Wno-ignored-qualifiers
     -Wno-missing-field-initializers
     -Wno-type-limits

sdkconfig.defaults

@@ -6,6 +6,17 @@ CONFIG_ESPTOOLPY_HEADER_FLASHSIZE_UPDATE=y
 CONFIG_SPIFFS_GC_MAX_RUNS=512
 CONFIG_FREERTOS_IDLE_TASK_STACKSIZE=3072
 
+# REDUCE RAM USAGE
+CONFIG_FREERTOS_PLACE_FUNCTIONS_INTO_FLASH=y
+CONFIG_RINGBUF_PLACE_FUNCTIONS_INTO_FLASH=y
+CONFIG_SPI_FLASH_ROM_DRIVER_PATCH=n
+CONFIG_ESP32_REV_MIN=3
+CONFIG_ESP_EVENT_POST_FROM_IRAM_ISR=n
+CONFIG_SPI_MASTER_ISR_IN_IRAM=n
+CONFIG_SPI_SLAVE_ISR_IN_IRAM=n
+CONFIG_HAL_DEFAULT_ASSERTION_LEVEL=0
+CONFIG_HEAP_PLACE_FUNCTION_INTO_FLASH=y
+
 # ARDUINO
 CONFIG_AUTOSTART_ARDUINO=y
 CONFIG_FREERTOS_HZ=1000

src/Config.h

@@ -5,7 +5,7 @@
 #define NUKI_HUB_VERSION "9.10"
 #define NUKI_HUB_VERSION_INT (uint32_t)910
 #define NUKI_HUB_BUILD "unknownbuildnr"
-#define NUKI_HUB_DATE "2025-04-01"
+#define NUKI_HUB_DATE "2025-04-02"
 
 #define GITHUB_LATEST_RELEASE_URL (char*)"https://github.com/technyon/nuki_hub/releases/latest"
 #define GITHUB_OTA_MANIFEST_URL (char*)"https://raw.githubusercontent.com/technyon/nuki_hub/binary/ota/manifest.json"

src/main.cpp

@@ -14,7 +14,7 @@
 #include "esp_core_dump.h"
 #include "FS.h"
 #include "SPIFFS.h"
-#include <ESPmDNS.h>
+//#include <ESPmDNS.h>
 #ifdef CONFIG_SOC_SPIRAM_SUPPORTED
 #include "esp_psram.h"
 #endif

src/networkDevices/NetworkDevice.cpp

@@ -16,7 +16,8 @@ void NetworkDevice::init()
     #ifdef CONFIG_SOC_SPIRAM_SUPPORTED
     if(esp_psram_get_size() > 0)
     {
-        _mqttInternal = true;
+        //_mqttInternal = true;
+        _mqttInternal = false;
     }
     #endif
     

src/networkDevices/WifiDevice.h

@@ -5,7 +5,6 @@
 #include "IPConfiguration.h"
 #include "esp_wifi.h"
 #include <WiFi.h>
-#include <ESPmDNS.h>
 
 class WifiDevice : public NetworkDevice
 {