Initial commit

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch
+settings-my-ignore.h

.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"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

README.md

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+# ESP8266 Ventilation Recomondation
+
+Ein Projekt zur Visualisierung von **Lüftungsempfelungen** mit einem **ESP8266**.  
+Das Script fragt periodisch eine Systemvariable von einer Homematic Zentrale ab.
+Wenn die Variable wahr ist wird das mittels einer grünen LED angezeigt. 
+
+<img src="https://git.gofel.net/Thorsten/esp8266_ventilation_recommendation/raw/branch/master/images/image_1.jpg" alt="Projektbild" width="300">
+
+
+## Funktionen
+- **LED leuchtet grün** Lüften empfohlen
+- **LED leuchtet rot**  Lüften nicht empfohlen
+- **LED blinkt cyan**   WLAN wird verbunden
+
+
+## Konfiguration
+
+Passe die `settings.h` auf deine Bedürfnisse an
+```cpp
+// ######################## WLAN-Daten ########################
+
+const char* hostname = "ESP6288_Keller_Lueften";
+
+const char* ssidList[] = {
+  "SSID_1",     // Netzwerk 1
+  "SSID_2",     // Netzwerk 2
+  "SSID_3"      // Netzwerk 3
+  // Weitere SSID hier hinzufügen
+};
+
+const char* passwordList[] = {
+  "Passwort_1",  // Passwort für SSID 1
+  "Passwort_2",  // Passwort für SSID 2
+  "Passwort_3"   // Passwort für SSID 3
+  // Weitere Passwörter hier hinzufügen
+};
+
+// ################# Homematic Systemvariable #################
+
+const char* hm_sysvar_url = "http://192.168.178.50/addons/xmlapi/sysvar.cgi?sid=kYvzkyRPluLBsfLL&ise_id=20746";
+
+// ############################################################
+```
+
+## Verdrahtung
+
+| ESP8266 | LED |
+|---------|-----|
+| D1      | R   |
+| D2      | G   |
+| D3      | B   |
+| G       | I   |
+
+
+<img src="https://git.gofel.net/Thorsten/esp8266_ventilation_recommendation/raw/branch/master/images/image_2.jpg" alt="Verdrahtung" width="600">

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

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
+; https://docs.platformio.org/page/projectconf.html
+
+[env:nodemcuv2]
+platform = espressif8266
+board = nodemcuv2
+framework = arduino
+upload_speed = 115200
+monitor_speed = 115200
+;lib_deps =
+;  LiquidCrystal_I2C

src/main.cpp

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+#include <Arduino.h>
+#include <ESP8266WiFi.h>
+#include <ESP8266HTTPClient.h>
+#include <settings.h>
+
+
+int numNetworks = sizeof(ssidList) / sizeof(ssidList[0]);  // Anzahl der Netzwerke
+int current_ap = 0;  // Start mit der ersten SSID
+bool reconnecting = false;  // Flag für den Reconnect-Status
+
+// Pin-Definitionen
+int PinRED = 5;
+int PinGREEN = 4;
+int PinBLUE = 0;
+
+// Funktion, um die LED-Farbe zu setzen
+void led_set_color(String color) {
+  if (color == "red") {
+    digitalWrite(PinRED, HIGH);
+    digitalWrite(PinGREEN, LOW);
+    digitalWrite(PinBLUE, LOW);
+  } else if (color == "green") {
+    digitalWrite(PinRED, LOW);
+    digitalWrite(PinGREEN, HIGH);
+    digitalWrite(PinBLUE, LOW);
+  } else if (color == "blue") {
+    digitalWrite(PinRED, LOW);
+    digitalWrite(PinGREEN, LOW);
+    digitalWrite(PinBLUE, HIGH);
+  } else if (color == "yellow") { // Rot + Grün
+    digitalWrite(PinRED, HIGH);
+    digitalWrite(PinGREEN, HIGH);
+    digitalWrite(PinBLUE, LOW);
+  } else if (color == "cyan") { // Grün + Blau
+    digitalWrite(PinRED, LOW);
+    digitalWrite(PinGREEN, HIGH);
+    digitalWrite(PinBLUE, HIGH);
+  } else if (color == "pink") { // Rot + Blau (auch Magenta)
+    digitalWrite(PinRED, HIGH);
+    digitalWrite(PinGREEN, LOW);
+    digitalWrite(PinBLUE, HIGH);
+  } else if (color == "white") { // Alle Farben
+    digitalWrite(PinRED, HIGH);
+    digitalWrite(PinGREEN, HIGH);
+    digitalWrite(PinBLUE, HIGH);
+  } else if (color == "off") { // LED aus
+    digitalWrite(PinRED, LOW);
+    digitalWrite(PinGREEN, LOW);
+    digitalWrite(PinBLUE, LOW);
+  } else {
+    Serial.println("Unbekannte Farbe: " + color);
+  }
+}
+
+
+// Funktion, um zu einem der Netzwerke zu verbinden
+void connectToWiFi() {
+
+  Serial.println("WLAN Verbindungsaufbau zu: " + String(ssidList[current_ap]));
+
+
+  // Verbinde mit dem aktuellen AP (SSID und Passwort aus den Arrays)
+  WiFi.begin(ssidList[current_ap], passwordList[current_ap]);
+
+  // Warte auf die Verbindung
+  int attempt = 0;
+  while (WiFi.status() != WL_CONNECTED && attempt < 10) {
+    led_set_color("cyan");
+    Serial.print(".");  // Punkt ausgeben, um anzuzeigen, dass es versucht, sich zu verbinden
+    delay(500);
+    led_set_color("off");
+    Serial.print(".");  // Punkt ausgeben, um anzuzeigen, dass es versucht, sich zu verbinden
+    delay(500);
+    attempt++;
+  }
+
+  // Wenn keine Verbindung hergestellt werden konnte, wechsle zum nächsten Netzwerk
+  if (WiFi.status() != WL_CONNECTED) {
+    WiFi.disconnect();
+    delay(500);
+    Serial.println("");
+    Serial.println("Verbindung fehlgeschlagen.");
+    current_ap = (current_ap + 1) % numNetworks;  // Wechsel zur nächsten SSID, nach der letzten wieder zur ersten
+    reconnecting = false;  // Zurücksetzen des Flags, falls alle Netzwerke fehlgeschlagen sind
+  }
+  else {
+    Serial.print("\nWLAN verbunden: ");
+    Serial.print(WiFi.SSID());
+    Serial.print(" ");
+    Serial.println(WiFi.RSSI());
+
+    reconnecting = false;  // Verbindung erfolgreich, setze reconnecting zurück
+
+  }
+
+}
+
+// Funktion zum Extrahieren des Wertes aus der XML-Antwort
+String extractValue(const String& url) {
+  WiFiClient client; // WiFiClient-Objekt erstellen
+  HTTPClient http;
+  
+  http.begin(client, url); // WiFiClient und URL übergeben
+
+  int httpResponseCode = http.GET();
+  if (httpResponseCode > 0) {
+    String response = http.getString();
+    Serial.println("Antwort: " + response);
+
+    int startIndex = response.indexOf("value='");
+    if (startIndex == -1) {
+      http.end(); // Verbindung schließen
+      return "";
+    }
+
+    startIndex += 7; // Länge von "value='"
+    int endIndex = response.indexOf("'", startIndex);
+    if (endIndex == -1) {
+      http.end(); // Verbindung schließen
+      return "";
+    }
+
+    http.end(); // Verbindung schließen
+    return response.substring(startIndex, endIndex);
+  } else {
+    Serial.println("HTTP-Fehler: " + String(httpResponseCode));
+  }
+
+  http.end(); // Verbindung schließen
+  return "";
+}
+
+
+
+void setup() {
+  Serial.begin(115200);
+  delay(200);
+  
+  Serial.println("Setze Pins als Ausgänge");
+  pinMode(PinRED, OUTPUT);
+  pinMode(PinGREEN, OUTPUT);
+  pinMode(PinBLUE, OUTPUT);
+}
+
+void loop() {
+
+  // Prüfe, ob die Verbindung verloren wurde
+  if (WiFi.status() != WL_CONNECTED && !reconnecting) {
+    Serial.println("WLAN Verbindung verloren. Versuche erneut zu verbinden...");
+    reconnecting = true;  // Setze Flag, dass ein Reconnectversuch läuft
+    connectToWiFi();  // Versuche eine neue Verbindung
+  }
+
+  // Wenn alle Netzwerke durchlaufen wurden und noch keine Verbindung besteht, setze das reconnecting-Flag zurück
+  if (WiFi.status() != WL_CONNECTED && current_ap == 0) {
+    reconnecting = false;
+  }
+
+
+  if (WiFi.status() == WL_CONNECTED && !reconnecting) {
+
+
+    String value = extractValue(hm_sysvar_url);
+    Serial.println("Extrahierter Wert (Lüften sinnvoll?): " + value);
+
+    if (value) {
+      led_set_color("green");
+      Serial.println("Grüne LED einschalten");
+
+    } else {
+      led_set_color("red");
+      Serial.println("Rote LED einschalten");
+    }
+
+  }
+
+  delay(60000);
+}

src/settings.h

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+#ifndef SETTINGS_H
+#define SETTINGS_H
+
+// ######################## WLAN-Daten ########################
+
+const char* hostname = "ESP6288_Keller_Lueften";
+
+const char* ssidList[] = {
+  "SSID_1",     // Netzwerk 1
+  "SSID_2",     // Netzwerk 2
+  "SSID_3"      // Netzwerk 3
+  // Weitere SSID hier hinzufügen
+};
+
+const char* passwordList[] = {
+  "Passwort_1",  // Passwort für SSID 1
+  "Passwort_2",  // Passwort für SSID 2
+  "Passwort_3"   // Passwort für SSID 3
+  // Weitere Passwörter hier hinzufügen
+};
+
+// ################# Homematic Systemvariable #################
+
+const char* hm_sysvar_url = "http://192.168.178.50/addons/xmlapi/sysvar.cgi?sid=kYvzkyRPluLBsfLL&ise_id=20746";
+
+// ############################################################
+
+
+#endif // SETTINGS_H

test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html