CPU temp and compile options for size

Author: martin-ger

CMakeLists.txt

@@ -2,7 +2,7 @@
 # in this exact order for cmake to work correctly
 cmake_minimum_required(VERSION 3.16)
 
-set(PROJECT_VER "2.4.9")
+set(PROJECT_VER "2.4.10")
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 project(esp32_nat_router)
 

README.md

@@ -39,7 +39,7 @@ Starting from this code base I started several spin-off projects with slightly d
 - **OLED Display**: Status display on 72x40 I2C SSD1306 OLEDs (as found on some ESP32-C3 mini boards)
 - **MQTT Home Assistant**: Publish telemetry and per-client stats to MQTT with HA auto-discovery
 - **MCP Bridge (AI-Ready)**: BETA - Control the router from AI assistants (Claude, etc.) via the Model Context Protocol
-- **mDNS**: The router is reachable as `esp32-nat-router.local` via mDNS/Bonjour — no need to look up the IP address (not available on ESP32-C5 due to flash size constraints)
+- **mDNS**: The router is reachable as `esp32-nat-router.local` via mDNS/Bonjour — no need to look up the IP address.
 - **OTA Updates**: Flash new firmware directly from the Web UI
 
 The maximum number of simultaniously connected WiFi clients is 8 (5 on the ESP32c3) due to RAM limitations (uses about 5KB per client). Each of the features: Web Interface, PCAP Capture, Wireguard VPN, Remote Console, WPA Enterprise and MQTT Home Assistant require several KB of additional RAM. So using all of them at once will probably burst the ESP32's ressources. Unused/disabled features are optimized for minimal to no RAM usage. Have a look at remaining heap size if in doubt.

components/acl/CMakeLists.txt

@@ -8,3 +8,4 @@ idf_component_register(
     REQUIRES lwip esp_netif esp_timer
     PRIV_REQUIRES nvs_flash cmd_router
 )
+target_compile_options(${COMPONENT_LIB} PRIVATE -O2)

components/cmd_router/CMakeLists.txt

@@ -1,3 +1,4 @@
 idf_component_register(SRCS "cmd_router.c"
                     INCLUDE_DIRS . "${CMAKE_SOURCE_DIR}/include"
                     REQUIRES console nvs_flash esp_wifi driver spi_flash pcap_capture acl remote_console syslog oled_display mbedtls app_update)
+target_compile_options(${COMPONENT_LIB} PRIVATE -Os)

components/cmd_router/cmd_router.c

@@ -36,6 +36,10 @@
 #include "esp_random.h"
 
 #include "driver/gpio.h"
+#include "soc/soc_caps.h"
+#if SOC_TEMP_SENSOR_SUPPORTED
+#include "driver/temperature_sensor.h"
+#endif
 #include "router_globals.h"
 #include "cmd_router.h"
 #include "pcap_capture.h"
@@ -1360,18 +1364,39 @@ static int show(int argc, char **argv)
             printf("Uplink IP: none\n");
         }
 
-        // Byte counts
-        printf("Bytes sent/received: %" PRIu64 " / %" PRIu64 " bytes\n", get_sta_bytes_sent(), get_sta_bytes_received());
-
-        // Free heap
-        printf("Free heap: %lu bytes\n", (unsigned long)esp_get_free_heap_size());
-
         // AP interface state
         printf("AP interface: %s\n", ap_disabled ? "disabled" : "enabled");
 
         // Connected clients
         resync_connect_count();
         printf("Connected clients: %u\n", connect_count);
+
+        // Byte counts
+        char _sent_buf[16], _recv_buf[16];
+        format_bytes_human(get_sta_bytes_sent(), _sent_buf, sizeof(_sent_buf));
+        format_bytes_human(get_sta_bytes_received(), _recv_buf, sizeof(_recv_buf));
+        printf("Bytes sent/received: %s / %s\n", _sent_buf, _recv_buf);
+
+
+#if SOC_TEMP_SENSOR_SUPPORTED
+        // CPU temperature
+        {
+            temperature_sensor_handle_t tsens;
+            temperature_sensor_config_t tsens_cfg = TEMPERATURE_SENSOR_CONFIG_DEFAULT(-10, 80);
+            if (temperature_sensor_install(&tsens_cfg, &tsens) == ESP_OK) {
+                float celsius = 0.0f;
+                temperature_sensor_enable(tsens);
+                if (temperature_sensor_get_celsius(tsens, &celsius) == ESP_OK) {
+                    printf("CPU temperature: %.1f °C\n", celsius);
+                }
+                temperature_sensor_disable(tsens);
+                temperature_sensor_uninstall(tsens);
+            }
+        }
+#endif
+        // Free heap
+        printf("Free heap: %lu bytes\n", (unsigned long)esp_get_free_heap_size());
+
         if (connect_count > 0) {
             connected_client_t clients[8];
             int count = get_connected_clients(clients, 8);

components/cmd_system/CMakeLists.txt

@@ -1,3 +1,4 @@
 idf_component_register(SRCS "cmd_system.c"
                     INCLUDE_DIRS .
-                    REQUIRES console spi_flash driver nvs_flash cmd_router lwip)
+                    REQUIRES console spi_flash driver nvs_flash cmd_router lwip)
+target_compile_options(${COMPONENT_LIB} PRIVATE -Os)

components/dhcpserver/CMakeLists.txt

@@ -17,7 +17,7 @@ idf_component_register(
 
 # Suppress address comparison warnings (same as upstream lwip component)
 # Suppress unused-but-set-variable for ESP_LOG macros that may be compiled out
-target_compile_options(${COMPONENT_LIB} PRIVATE -Wno-address -Wno-unused-but-set-variable)
+target_compile_options(${COMPONENT_LIB} PRIVATE -Wno-address -Wno-unused-but-set-variable -O2)
 
 # List of all public dhcpserver functions to wrap
 set(DHCPS_WRAP_FUNCTIONS

components/http_server/CMakeLists.txt

@@ -6,4 +6,4 @@ idf_component_register(
                   remote_console dhcpserver wpa_supplicant
                   app_update esp_app_format mbedtls
 )
-target_compile_options(${COMPONENT_LIB} PRIVATE -Wno-unused-function)
+target_compile_options(${COMPONENT_LIB} PRIVATE -Wno-unused-function -Os)

components/http_server/http_server.c

@@ -1229,9 +1229,10 @@ static esp_err_t index_get_handler(httpd_req_t *req)
     /* Stream Bytes row (sent/received combined) */
     uint64_t bytes_sent = get_sta_bytes_sent();
     uint64_t bytes_received = get_sta_bytes_received();
-    float sent_mb = bytes_sent / (1024.0 * 1024.0);
-    float received_mb = bytes_received / (1024.0 * 1024.0);
-    snprintf(row, sizeof(row), "<tr><td>Bytes:</td><td>%.1f MB sent / %.1f MB received</td></tr>", sent_mb, received_mb);
+    char sent_buf[16], recv_buf[16];
+    format_bytes_human(bytes_sent, sent_buf, sizeof(sent_buf));
+    format_bytes_human(bytes_received, recv_buf, sizeof(recv_buf));
+    snprintf(row, sizeof(row), "<tr><td>Bytes:</td><td>%s sent / %s received</td></tr>", sent_buf, recv_buf);
     httpd_resp_send_chunk(req, row, HTTPD_RESP_USE_STRLEN);
 
     /* Stream Monitoring row */

components/mqtt_ha/CMakeLists.txt

@@ -9,3 +9,4 @@ idf_component_register(
     INCLUDE_DIRS "include"
     PRIV_REQUIRES mqtt esp_event esp_wifi esp_netif esp_timer nvs_flash console cmd_router remote_console
 )
+target_compile_options(${COMPONENT_LIB} PRIVATE -Os)