changes for generial input/output via mqtt

lib/gpio2go/main.cpp

@@ -0,0 +1,38 @@
+#include "Arduino.h"
+#include "Gpio2Go.h"
+
+#define INPUT_PIN 21
+
+bool hasMessage = false;
+String message;
+
+void inputCb(const int & pin)
+{
+    message = "";
+    message.concat("Input, Pin ");
+    message.concat(pin);
+    message.concat(" ");
+    message.concat(", state ");
+    message.concat(digitalRead(INPUT_PIN) ? "High" : "Low");
+    hasMessage = true;
+}
+
+void setup()
+{
+    Serial.begin(115200);
+
+    delay(1100);
+    Serial.println(F("Started"));
+    Gpio2Go::configurePin(INPUT_PIN, PinMode::InputPullup, InterruptMode::Change, 200);
+    Gpio2Go::subscribe(inputCb);
+}
+
+void loop()
+{
+    delay(100);
+    if(hasMessage)
+    {
+        hasMessage = false;
+        Serial.println(message);
+    }
+}