diff --git a/deploy/nginx.conf b/deploy/nginx.conf
index fc09ba6..252c7cd 100644
--- a/deploy/nginx.conf
+++ b/deploy/nginx.conf
@@ -28,6 +28,21 @@ server {
         proxy_set_header Host $host;
     }
 
+    # WebSocket endpoints (ESP32 simulation, etc.)
+    # Must come BEFORE the generic /api/ block so nginx matches it first.
+    location /api/simulation/ws/ {
+        proxy_pass http://127.0.0.1:8001/api/simulation/ws/;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_read_timeout 86400s;
+        proxy_send_timeout 86400s;
+    }
+
     # Proxy /api/* requests to the FastAPI backend.
     # FastAPI Swagger UI is at /api/docs (moved from /docs to avoid
     # conflicting with the frontend /docs/* documentation routes).
diff --git a/frontend/src/data/examples.ts b/frontend/src/data/examples.ts
index b814edb..ed4b270 100644
--- a/frontend/src/data/examples.ts
+++ b/frontend/src/data/examples.ts
@@ -2034,23 +2034,12 @@ void loop() {
 // Blinks the built-in LED (GPIO2) and an external LED (GPIO4)
 // Requires arduino-esp32 2.0.17 (IDF 4.4.x) — see docs/ESP32_EMULATION.md
 
-#include <soc/timer_group_struct.h>
-#include <soc/timer_group_reg.h>
 
 #define LED_BUILTIN_PIN 2   // Built-in blue LED on ESP32 DevKit
 #define LED_EXT_PIN     4   // External red LED
 
-void disableAllWDT() {
-  TIMERG0.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG0.wdt_config0.en = 0;
-  TIMERG0.wdt_wprotect = 0;
-  TIMERG1.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG1.wdt_config0.en = 0;
-  TIMERG1.wdt_wprotect = 0;
-}
 
 void setup() {
-  disableAllWDT();
   Serial.begin(115200);
   pinMode(LED_BUILTIN_PIN, OUTPUT);
   pinMode(LED_EXT_PIN, OUTPUT);
@@ -2058,7 +2047,6 @@ void setup() {
 }
 
 void loop() {
-  disableAllWDT();
   digitalWrite(LED_BUILTIN_PIN, HIGH);
   digitalWrite(LED_EXT_PIN, HIGH);
   Serial.println("LED ON");
@@ -2090,20 +2078,9 @@ void loop() {
 // Echoes anything received on Serial (UART0) back to the sender.
 // Open the Serial Monitor, type something, and see it echoed back.
 
-#include <soc/timer_group_struct.h>
-#include <soc/timer_group_reg.h>
 
-void disableAllWDT() {
-  TIMERG0.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG0.wdt_config0.en = 0;
-  TIMERG0.wdt_wprotect = 0;
-  TIMERG1.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG1.wdt_config0.en = 0;
-  TIMERG1.wdt_wprotect = 0;
-}
 
 void setup() {
-  disableAllWDT();
   Serial.begin(115200);
   delay(500);
   Serial.println("ESP32 Serial Echo ready!");
@@ -2111,7 +2088,6 @@ void setup() {
 }
 
 void loop() {
-  disableAllWDT();
   if (Serial.available()) {
     String input = Serial.readStringUntil('\\n');
     input.trim();
@@ -2933,8 +2909,6 @@ void loop() {
     code: `// ESP32 — 7-Segment Display Counter 0-9
 // Segments: a=12, b=13, c=14, d=25, e=26, f=27, g=32
 
-#include <soc/timer_group_struct.h>
-#include <soc/timer_group_reg.h>
 
 const int SEG[7] = {12, 13, 14, 25, 26, 27, 32};
 
@@ -2951,14 +2925,6 @@ const bool DIGITS[10][7] = {
   {1,1,1,1,0,1,1}, // 9
 };
 
-void disableAllWDT() {
-  TIMERG0.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG0.wdt_config0.en = 0;
-  TIMERG0.wdt_wprotect = 0;
-  TIMERG1.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG1.wdt_config0.en = 0;
-  TIMERG1.wdt_wprotect = 0;
-}
 
 void showDigit(int d) {
   for (int i = 0; i < 7; i++)
@@ -2966,14 +2932,12 @@ void showDigit(int d) {
 }
 
 void setup() {
-  disableAllWDT();
   for (int i = 0; i < 7; i++) pinMode(SEG[i], OUTPUT);
   Serial.begin(115200);
   Serial.println("ESP32 7-Segment Counter");
 }
 
 void loop() {
-  disableAllWDT();
   for (int d = 0; d <= 9; d++) {
     showDigit(d);
     Serial.print("Digit: "); Serial.println(d);
@@ -3751,8 +3715,6 @@ void loop() {
 // Wiring: DATA → GPIO4  |  VCC → 3V3  |  GND → GND
 
 #include <DHT.h>
-#include <soc/timer_group_struct.h>
-#include <soc/timer_group_reg.h>
 
 #define DHT_PIN  4    // GPIO 4
 #define DHT_TYPE DHT22
@@ -3760,17 +3722,8 @@ void loop() {
 DHT dht(DHT_PIN, DHT_TYPE);
 
 // Disable hardware Timer Group WDTs (QEMU emulation is slower than real time)
-void disableAllWDT() {
-  TIMERG0.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG0.wdt_config0.en = 0;
-  TIMERG0.wdt_wprotect = 0;
-  TIMERG1.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG1.wdt_config0.en = 0;
-  TIMERG1.wdt_wprotect = 0;
-}
 
 void setup() {
-  disableAllWDT();
   Serial.begin(115200);
   dht.begin();
   delay(2000);
@@ -3778,7 +3731,6 @@ void setup() {
 }
 
 void loop() {
-  disableAllWDT();
   delay(2000);
 
   float h = dht.readHumidity();
@@ -3810,23 +3762,12 @@ void loop() {
     code: `// ESP32 — HC-SR04 Ultrasonic Distance Sensor
 // Wiring: TRIG → D18  |  ECHO → D19  |  VCC → 3V3  |  GND → GND
 
-#include <soc/timer_group_struct.h>
-#include <soc/timer_group_reg.h>
 
 #define TRIG_PIN 18
 #define ECHO_PIN 19
 
-void disableAllWDT() {
-  TIMERG0.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG0.wdt_config0.en = 0;
-  TIMERG0.wdt_wprotect = 0;
-  TIMERG1.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG1.wdt_config0.en = 0;
-  TIMERG1.wdt_wprotect = 0;
-}
 
 void setup() {
-  disableAllWDT();
   Serial.begin(115200);
   pinMode(TRIG_PIN, OUTPUT);
   pinMode(ECHO_PIN, INPUT);
@@ -3844,7 +3785,6 @@ long measureCm() {
 }
 
 void loop() {
-  disableAllWDT();
   long cm = measureCm();
   if (cm < 0) Serial.println("Out of range");
   else        Serial.printf("Distance: %ld cm\\n", cm);
@@ -3872,25 +3812,14 @@ void loop() {
 // Requires: Adafruit MPU6050, Adafruit Unified Sensor libraries
 // Wiring: SDA → D21  |  SCL → D22  |  VCC → 3V3  |  GND → GND
 
-#include <soc/timer_group_struct.h>
-#include <soc/timer_group_reg.h>
 #include <Adafruit_MPU6050.h>
 #include <Adafruit_Sensor.h>
 #include <Wire.h>
 
 Adafruit_MPU6050 mpu;
 
-void disableAllWDT() {
-  TIMERG0.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG0.wdt_config0.en = 0;
-  TIMERG0.wdt_wprotect = 0;
-  TIMERG1.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG1.wdt_config0.en = 0;
-  TIMERG1.wdt_wprotect = 0;
-}
 
 void setup() {
-  disableAllWDT();
   Serial.begin(115200);
   Wire.begin(21, 22); // SDA=21, SCL=22
   if (!mpu.begin()) {
@@ -3904,7 +3833,6 @@ void setup() {
 }
 
 void loop() {
-  disableAllWDT();
   sensors_event_t a, g, temp;
   mpu.getEvent(&a, &g, &temp);
 
@@ -3936,8 +3864,6 @@ void loop() {
     code: `// ESP32 — PIR Motion Sensor
 // Wiring: OUT → D5  |  VCC → 3V3  |  GND → GND
 
-#include <soc/timer_group_struct.h>
-#include <soc/timer_group_reg.h>
 
 #define PIR_PIN 5
 #define LED_PIN 2   // built-in blue LED on ESP32 DevKit
@@ -3945,17 +3871,8 @@ void loop() {
 bool prevMotion = false;
 unsigned long detections = 0;
 
-void disableAllWDT() {
-  TIMERG0.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG0.wdt_config0.en = 0;
-  TIMERG0.wdt_wprotect = 0;
-  TIMERG1.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG1.wdt_config0.en = 0;
-  TIMERG1.wdt_wprotect = 0;
-}
 
 void setup() {
-  disableAllWDT();
   Serial.begin(115200);
   pinMode(PIR_PIN, INPUT);
   pinMode(LED_PIN, OUTPUT);
@@ -3965,7 +3882,6 @@ void setup() {
 }
 
 void loop() {
-  disableAllWDT();
   bool motion = (digitalRead(PIR_PIN) == HIGH);
   if (motion && !prevMotion) {
     detections++;
@@ -4001,8 +3917,6 @@ void loop() {
 // Pot  : SIG → D34  |  VCC → 3V3  |  GND → GND
 
 #include <ESP32Servo.h>
-#include <soc/timer_group_struct.h>
-#include <soc/timer_group_reg.h>
 
 #define SERVO_PIN 13
 #define POT_PIN   34  // input-only GPIO (ADC)
@@ -4010,24 +3924,14 @@ void loop() {
 Servo myServo;
 
 // Disable hardware Timer Group WDTs (QEMU emulation is slower than real time)
-void disableAllWDT() {
-  TIMERG0.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG0.wdt_config0.en = 0;
-  TIMERG0.wdt_wprotect = 0;
-  TIMERG1.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG1.wdt_config0.en = 0;
-  TIMERG1.wdt_wprotect = 0;
-}
 
 void setup() {
-  disableAllWDT();
   Serial.begin(115200);
   myServo.attach(SERVO_PIN, 500, 2400); // standard servo pulse range
   Serial.println("ESP32 Servo + Pot control");
 }
 
 void loop() {
-  disableAllWDT();  // keep WDTs disabled (FreeRTOS may re-enable)
   int raw   = analogRead(POT_PIN);         // 0–4095 (12-bit ADC)
   int angle = map(raw, 0, 4095, 0, 180);
   myServo.write(angle);
@@ -4059,31 +3963,19 @@ void loop() {
 // Wiring: HORZ → D35 | VERT → D34 | SEL → D15
 //         VCC → 3V3  | GND → GND
 
-#include <soc/timer_group_struct.h>
-#include <soc/timer_group_reg.h>
 
 #define JOY_HORZ 35  // input-only ADC pin
 #define JOY_VERT 34  // input-only ADC pin
 #define JOY_BTN  15  // GPIO with pull-up
 
-void disableAllWDT() {
-  TIMERG0.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG0.wdt_config0.en = 0;
-  TIMERG0.wdt_wprotect = 0;
-  TIMERG1.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG1.wdt_config0.en = 0;
-  TIMERG1.wdt_wprotect = 0;
-}
 
 void setup() {
-  disableAllWDT();
   Serial.begin(115200);
   pinMode(JOY_BTN, INPUT_PULLUP);
   Serial.println("ESP32 Joystick ready");
 }
 
 void loop() {
-  disableAllWDT();
   int x    = analogRead(JOY_HORZ); // 0–4095
   int y    = analogRead(JOY_VERT); // 0–4095
   bool btn = (digitalRead(JOY_BTN) == LOW);
@@ -4121,8 +4013,6 @@ void loop() {
 // Wiring: DATA → GPIO3  |  VCC → 3V3  |  GND → GND
 
 #include <DHT.h>
-#include <soc/timer_group_struct.h>
-#include <soc/timer_group_reg.h>
 
 #define DHT_PIN  3    // GPIO 3
 #define DHT_TYPE DHT22
@@ -4130,17 +4020,8 @@ void loop() {
 DHT dht(DHT_PIN, DHT_TYPE);
 
 // Disable hardware Timer Group WDTs (QEMU emulation is slower than real time)
-void disableAllWDT() {
-  TIMERG0.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG0.wdt_config0.en = 0;
-  TIMERG0.wdt_wprotect = 0;
-  TIMERG1.wdt_wprotect = TIMG_WDT_WKEY_VALUE;
-  TIMERG1.wdt_config0.en = 0;
-  TIMERG1.wdt_wprotect = 0;
-}
 
 void setup() {
-  disableAllWDT();
   Serial.begin(115200);
   dht.begin();
   delay(2000);
@@ -4148,7 +4029,6 @@ void setup() {
 }
 
 void loop() {
-  disableAllWDT();
   delay(2000);
 
   float h = dht.readHumidity();