Initialize basic watchdog

firmware/esp32/source/main.cpp

@@ -1,3 +1,27 @@
+#include <iostream>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_system.h"
+#include "esp_log.h"
+#include "esp_pm.h"
+
+volatile bool critical_error_flag = false;
+
+static void watchdogTask(void pvParameters*) {
+    const TickType_t keepAlivePeriod = pdMS_TO_TICKS(30000);
+
+    for(;;) {
+        if (critical_error_flag) {
+            ESPLOGE("Critical error flag raised. Rebooting.");
+            esp_restart();
+        }
+        esp_task_wdt_reset();
+
+        vTaskDelay(keepAlivePeriod);
+    }
+}
+
 extern "C" void app_main(void)
 {
+    xTaskCreate(watchdogTask, "wdt", 256, NULL, configMAX_PRIORITIES-1, NULL);
 }