add watchdog

src/main.cpp

@@ -31,6 +31,7 @@
 #include "Records.hpp"
 #include "EthernetClient.hpp"
 #include "LinUdpGateway.hpp"
+#include "esp_system.h"
 
 constexpr uint8_t rib_id = 7;
 
@@ -39,19 +40,38 @@ Records records{};
 Config config{rib_id, records};
 LinUdpGateway linUdpGateway{Serial1, config, records};
 
+const int wdtTimeout = 5000; //time in ms to trigger the watchdog
+hw_timer_t *timer = NULL;
+
+void resetModule()
+{
+    // if this happens we need to emit 
+    // console.log("some meningful information") once the settings are restored and system is operational gaain
+    // to inform the server that we had an unexpected reboot.
+    // ets_printf("reboot\n");
+    esp_restart();
+}
+
 void setup()
 {
     Serial.begin(115200);
     Serial1.begin(19200);
     ethClient.connect(&config);
 
+    // set up watchdog 
+    timer = timerBegin(0, 80, true);                  //timer 0, div 80
+    timerAttachInterrupt(timer, &resetModule, true);  //attach callback
+    timerAlarmWrite(timer, wdtTimeout * 1000, false); //set time in us
+    timerAlarmEnable(timer);
+
     // Init configuration
     config.init();
 }
 
 void loop()
 {
     // Get configuration from server and send heartbeat
+    timerWrite(timer, 0); //reset timer (feed watchdog)
     config.run();
 
     if (!linUdpGateway.connected())