Add WiFi-on/off build presets and binary size compare workflow

platformio_override.sample.ini

@@ -191,6 +191,50 @@ build_flags = ${common.build_flags} ${esp8266.build_flags}
 ;   -D HW_PIN_MISOSPI=9
 
 
+
+# ------------------------------------------------------------------------------
+# SLWF-09 example: build two variants side-by-side for binary size comparison
+# ------------------------------------------------------------------------------
+# Usage:
+#   1) copy this file to platformio_override.ini
+#   2) set [platformio] default_envs to one or both envs below, OR call pio with -e
+#   3) build both and compare with: ./tools/compare_wifioff_size.sh slwf09_eth_wifi_on slwf09_eth_wifi_off
+
+[env:slwf09_eth_wifi_on]
+extends = env:esp32dev_16M
+build_flags =
+  ${env:esp32dev_16M.build_flags}
+  -D SERVERNAME="\"A1-SLWF-09\""
+  -D WLED_BRAND="\"A1-SLWF-09\""
+  -D MDNS_NAME="\"A1-SLWF-09\""
+  -D BTNPIN=39,34,36,38
+  -D BTNTYPE=BTN_TYPE_PUSH,BTN_TYPE_PUSH,BTN_TYPE_PUSH_ACT_HIGH,BTN_TYPE_PUSH
+  -D ABL_MILLIAMPS_DEFAULT=3000
+  -D DEFAULT_LED_PIN=4
+  -D DATA_PINS=4
+  -D DEFAULT_LED_EFFECT=157
+  -D DEFAULT_LED_COUNT=300
+  -D DEFAULT_LED_TYPE=TYPE_WS2812_RGB
+  -D RLYPIN=33
+  -D RLYMDE=0
+  -D WLED_USE_ETHERNET
+  -D WLED_ETH_DEFAULT=WLED_ETH_WT32_ETH01
+  -D UM_AUDIOREACTIVE_ENABLE
+  -D I2S_SDPIN=32
+  -D I2S_WSPIN=15
+  -D I2S_CKPIN=14
+  -D SR_SQUELCH=10
+  -D SR_GAIN=60
+  -D SR_DMTYPE=1
+  -D USERMOD_AUTO_SAVE
+  -D AUTOSAVE_AFTER_SEC=10
+  -D AUTOSAVE_PRESET_NUM=100
+  -D USERMOD_AUTO_SAVE_ON_BOOT=true
+
+[env:slwf09_eth_wifi_off]
+extends = env:slwf09_eth_wifi_on
+build_flags = ${env:slwf09_eth_wifi_on.build_flags} -D WLED_FORCE_WIFI_OFF
+
 # ------------------------------------------------------------------------------
 # Optional: build flags for speed, instead of optimising for size.
 # Example of usage: see [env:esp32S3_PSRAM_HUB75]

tools/compare_wifioff_size.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ENV_ON="${1:-slwf09_eth_wifi_on}"
+ENV_OFF="${2:-slwf09_eth_wifi_off}"
+
+echo "==> Building $ENV_ON"
+pio run -e "$ENV_ON"
+echo "==> Building $ENV_OFF"
+pio run -e "$ENV_OFF"
+
+BIN_ON=".pio/build/${ENV_ON}/firmware.bin"
+BIN_OFF=".pio/build/${ENV_OFF}/firmware.bin"
+
+if [[ ! -f "$BIN_ON" || ! -f "$BIN_OFF" ]]; then
+  echo "Binary missing. Expected:"
+  echo "  $BIN_ON"
+  echo "  $BIN_OFF"
+  exit 2
+fi
+
+SIZE_ON=$(stat -c '%s' "$BIN_ON")
+SIZE_OFF=$(stat -c '%s' "$BIN_OFF")
+DELTA=$((SIZE_OFF - SIZE_ON))
+
+echo
+echo "Firmware binaries:"
+echo "  WiFi ON : $BIN_ON"
+echo "  WiFi OFF: $BIN_OFF"
+echo
+echo "Sizes (bytes):"
+printf '  %-10s %12d\n' "WiFi ON" "$SIZE_ON"
+printf '  %-10s %12d\n' "WiFi OFF" "$SIZE_OFF"
+printf '  %-10s %12d\n' "Delta" "$DELTA"
+echo
+
+echo "SHA256:"
+sha256sum "$BIN_ON" "$BIN_OFF"

wled00/my_config_sample.h

@@ -22,5 +22,6 @@
 #define CLIENT_PASS "Your_Password"
 */
 
+//#define WLED_FORCE_WIFI_OFF // Hard disable WiFi radio (WIFI_OFF): no STA and no AP.
 //#define MAX_LEDS 1500       // Maximum total LEDs. More than 1500 might create a low memory situation on ESP8266.
 //#define MDNS_NAME "wled"    // mDNS hostname, ie: *.local

wled00/wled.cpp

@@ -511,8 +511,13 @@ void WLED::setup()
   WiFi.persistent(false); // on ES8266 using NVM for wifi config has no benefit of faster connection
   #endif
   WiFi.onEvent(WiFiEvent);
+#ifdef WLED_FORCE_WIFI_OFF
+  DEBUG_PRINTLN(F("WLED_FORCE_WIFI_OFF: forcing WiFi OFF."));
+  WiFi.mode(WIFI_OFF);
+#else
   WiFi.mode(WIFI_STA); // enable scanning
   findWiFi(true);      // start scanning for available WiFi-s
+#endif
 
   // all GPIOs are allocated at this point
   serialCanRX = !PinManager::isPinAllocated(hardwareRX); // Serial RX pin (GPIO 3 on ESP32 and ESP8266)
@@ -633,6 +638,10 @@ void WLED::beginStrip()
 
 void WLED::initAP(bool resetAP)
 {
+#ifdef WLED_FORCE_WIFI_OFF
+  return;
+#endif
+
   if (apBehavior == AP_BEHAVIOR_BUTTON_ONLY && !resetAP)
     return;
 
@@ -673,6 +682,14 @@ void WLED::initAP(bool resetAP)
 void WLED::initConnection()
 {
   DEBUG_PRINTF_P(PSTR("initConnection() called @ %lus.\n"), millis()/1000);
+#ifdef WLED_FORCE_WIFI_OFF
+  DEBUG_PRINTLN(F("WLED_FORCE_WIFI_OFF active. Skipping WiFi/AP init."));
+  lastReconnectAttempt = millis();
+  WiFi.disconnect(true);
+  WiFi.mode(WIFI_OFF);
+  return;
+#endif
+
   #ifdef WLED_ENABLE_WEBSOCKETS
   ws.onEvent(wsEvent);
   #endif

wled00/wled.h

@@ -21,6 +21,8 @@
 
 // You are required to disable over-the-air updates:
 //#define WLED_DISABLE_OTA         // saves 14kb
+// hard-disable WiFi radio entirely (WIFI_OFF). AP/STA will not start.
+//#define WLED_FORCE_WIFI_OFF
 #ifdef WLED_ENABLE_AOTA
   #if defined(WLED_DISABLE_OTA)
     #warning WLED_DISABLE_OTA was defined but it will be ignored due to WLED_ENABLE_AOTA.