Add a simple manual replacement controller for the heating.

Network/ManualHeatingController/ManualHeatingController.ino

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+// Manual replacement for the YaHMS controller used on the
+// heating in DoES Liverpool
+//
+// Use it when the network is down and the existing controller
+// can't receive its instructions
+//
+// Circuit:
+// Needs a pushbutton connected to 5V on one side and kSwitchPin
+// on the other, with kSwitchPin also connected to ground through
+// a pull-down resistor
+// And an LED connected to pin kIndicatorPin will illuminate
+// whenever the heating is on
+//
+// Usage:
+// Heating is turned on when the LED is lit
+// Pressing the pushbutton will toggle the heating between
+// on and off
+
+const int kHeatingPin = 14;
+const int kSwitchPin = 2;
+const int kIndicatorPin = 13;
+const int kDebounceDelay = 500;
+
+int gLastButtonState = LOW;
+unsigned long gLastSwitchTime = 0UL;
+bool gHeatingState = false;
+
+void setup() {
+  // put your setup code here, to run once:
+  pinMode(kHeatingPin, OUTPUT);
+  pinMode(kSwitchPin, INPUT);
+  pinMode(kIndicatorPin, OUTPUT);
+
+  digitalWrite(kIndicatorPin, HIGH);
+  delay(300);
+  digitalWrite(kIndicatorPin, LOW);  
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  int buttonState = digitalRead(kSwitchPin);
+//Serial.print("buttonState: ");
+//Serial.println(buttonState);
+  if (buttonState != gLastButtonState) {
+    //Serial.println("Setting gLastSwitchTime");
+    gLastSwitchTime = millis();
+    gLastButtonState = buttonState;
+  }
+
+  if ((millis() - gLastSwitchTime) > kDebounceDelay) {
+    // We've got a button press
+//Serial.println("Switching...");
+
+    if (buttonState == HIGH) {
+      // It's a press
+//Serial.print("Changing heating state to ");
+      gHeatingState = !gHeatingState;
+//Serial.println(gHeatingState);
+    }
+  }
+
+  digitalWrite(kHeatingPin, gHeatingState);
+  digitalWrite(kIndicatorPin, gHeatingState);
+
+  delay(10);
+}