Software part

software/.gitignore

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+.pio
+.pioenvs
+.piolibdeps
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json

software/.vscode/extensions.json

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+{
+	// See http://go.microsoft.com/fwlink/?LinkId=827846
+	// for the documentation about the extensions.json format
+	"recommendations": [
+		"platformio.platformio-ide"
+	]
+}

software/.vscode/settings.json

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+{
+    "terminal.integrated.env.osx": {
+        "PATH": "/Users/monster/.platformio/penv/bin:/Users/monster/.platformio/penv:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/go/bin",
+        "PLATFORMIO_CALLER": "vscode"
+    }
+}

software/lib/readme.txt

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+
+This directory is intended for the project specific (private) libraries.
+PlatformIO will compile them to static libraries and link to executable file.
+
+The source code of each library should be placed in separate directory, like
+"lib/private_lib/[here are source files]".
+
+For example, see how can be organized `Foo` and `Bar` libraries:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) http://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- readme.txt --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+Then in `src/main.c` you should use:
+
+#include <Foo.h>
+#include <Bar.h>
+
+// rest H/C/CPP code
+
+PlatformIO will find your libraries automatically, configure preprocessor's
+include paths and build them.
+
+More information about PlatformIO Library Dependency Finder
+- http://docs.platformio.org/page/librarymanager/ldf.html

software/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; http://docs.platformio.org/page/projectconf.html
+
+[env:d1_mini]
+platform = espressif8266
+board = nodemcuv2
+framework = arduino
+lib_deps =
+  # Using a library name
+  ArduinoJSON@5.10.0
+  Homie@1.5.0,
+  Bounce2
+
+monitor_speed = 115200
+#upload_speed = 921600
+
+#build_flags = -Wl,-Tesp8266.flash.4m1m.ld

software/src/main.ino

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+#include <Arduino.h>
+#include <Homie.h>
+
+#define NEST_Y1 D5 //#
+#define NEST_Y2 D6 //#
+#define NEST_G D7 //D3
+#define NEST_S D2
+#define NEST_W1 D1 //#
+#define NEST_W2 D0
+
+
+int lastState_W1 = -1;
+int lastState_W2 = -1;
+int lastState_Y1 = -1;
+int lastState_Y2 = -1;
+int lastState_S = -1;
+int lastState_G = -1;
+
+bool state_w1 = false;
+bool state_w2 = false;
+bool state_y1 = false;
+bool state_y2 = false;
+bool state_s = false;
+bool state_g = false;
+
+HomieNode nestNode("nest", "node");
+
+bool resetHandler(String value) {
+  //remove config =)
+  SPIFFS.remove("/homie/config.json");
+
+  Homie.setNodeProperty(nestNode, "reset", value, false);
+  return true;
+}
+
+void setupHandler() {
+  pinMode(NEST_W1, INPUT_PULLUP);
+  pinMode(NEST_W2, INPUT_PULLUP);
+  pinMode(NEST_Y1, INPUT_PULLUP);
+  pinMode(NEST_Y2, INPUT_PULLUP);
+  pinMode(NEST_S, INPUT_PULLUP);
+  pinMode(NEST_G, INPUT_PULLUP);
+
+  nestNode.subscribe("reset", resetHandler);
+}
+
+void loopHandler() {
+}
+
+void setup() {
+  SPIFFS.begin();
+  Homie.disableResetTrigger();
+
+  Homie.setFirmware("nest-firmware", "1.0.0");
+  Homie.setSetupFunction(setupHandler);
+  Homie.setLoopFunction(loopHandler);
+  Homie.registerNode(nestNode);
+  Homie.setup();
+}
+
+void read_pin(int pin, bool &pin_state) {
+  int state = digitalRead(pin);
+  // Serial.print(pin);
+  // Serial.print("=");
+  // Serial.println(state);
+  if (state == 0) {
+    pin_state = true;
+  }
+}
+
+void send_state(int state, int& lastState, const String name) {  
+  if (state != lastState) {
+    Serial.print(name);
+    Serial.print(" state changed from ");
+    Serial.print(lastState);
+    Serial.print(" to ");
+    Serial.println(state);
+
+    Homie.setNodeProperty(nestNode, name, String(state), true);
+    lastState = state;
+  }
+}
+
+void measure_pins() {
+  state_w1 = false;
+  state_w2 = false;
+  state_y1 = false;
+  state_y2 = false;
+  state_s = false;
+  state_g = false;
+  for(int i = 0; i<250; i++) {
+    read_pin(NEST_W1, state_w1);
+    read_pin(NEST_W2, state_w2);
+    read_pin(NEST_Y1, state_y1);
+    read_pin(NEST_Y2, state_y2);
+    read_pin(NEST_S, state_s);
+    read_pin(NEST_G, state_g);
+    Homie.loop();
+    delay(1);
+  }
+  send_state(state_w1, lastState_W1, "w1");
+  send_state(state_w2, lastState_W2, "w2");
+  send_state(state_y1, lastState_Y1, "y1");
+  send_state(state_y2, lastState_Y2, "y2");
+  send_state(state_s, lastState_S, "s");
+  send_state(state_g, lastState_G, "g");
+}
+
+void loop() {
+    measure_pins();
+}