Major update/rewrite/recombine to get SSDP, and GrowController UI and application shell.

Firmware/Utility.cpp

@@ -0,0 +1,29 @@
+//
+//
+//	Utility functions
+//
+//
+#include <ESP8266WiFi.h>
+
+#include "Utility.h"
+
+static String macToStr(const uint8_t * mac);
+
+String GetMacString() {
+  unsigned char mac[6];
+  WiFi.macAddress(mac);
+  String clientMac(macToStr(mac));
+  return clientMac;
+}
+
+String macToStr(const uint8_t * mac) {
+  String result;
+
+  for (int i = 0; i < 6; ++i) {
+    result += String(mac[i], 16);
+    if (i < 5)
+      result += ':';
+  }
+  return result;
+}
+