MQTT messages. Button anleren, Wifi frontend

src/helper.h

@@ -0,0 +1,10 @@
+#pragma once
+#include <Arduino.h>
+#include "master.h"
+
+std::array<uint8_t, 6> macStringToBytes(const char* macStr) {
+    std::array<uint8_t, 6> bytes;
+    sscanf(macStr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", 
+           &bytes[0], &bytes[1], &bytes[2], &bytes[3], &bytes[4], &bytes[5]);
+    return bytes;
+}