Remove stuff that came from a different app when this was derived.

Prepare to add DNSServer for captive portal.

Firmware/Utility.h

@@ -3,9 +3,33 @@
 //	Utility.h
 //
 //
+#ifndef UTILITY_H
+#define UTILITY_H
+
 
 #include <ESP8266WiFi.h>
 
 // Returns the MAC Address as a string object
-String GetMacString();
+String GetMacString(char padd = ':');
 
+
+// Dump a block of memory as a hex title-named listing
+//
+void HexDump(const char * title, const uint8_t * p, int count);
+
+
+// A macro to generate a build error on the condition
+//
+// Example:
+// 		BUILD_BUG_ON(sizeof(something) > limit);
+//
+#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
+
+// And the more positive direction
+//
+// Example:
+//		COMPILER_ASSERT(sizeof(something) <= limit);
+//
+#define COMPILER_ASSERT(condition) ((void)sizeof(char[-!(condition)]))
+
+#endif // UTILITY_H