meterbusclient is working, SND_NKE will be answered

fatal.cpp

@@ -1,10 +1,11 @@
-#include <avr/interrupt.h>
 #include"fatal.h"
 
+#include <Arduino.h>
 
 void fatal(uint8_t code) {
   // cli();
   // do something with the code and somehow show that there is a problem
+  Serial.print("Fatal: "); Serial.println(code);
   while (1);
 }