WeMos D1 mini with relais-shield as garage-door opener

control the motor-driven garage-door with voicecontrol over amazon echo
and smarthome yourself.
More Info at:
https://smarthomeyourself.de/garagentor

d1_mini_garagentor_controller.ino

@@ -0,0 +1,288 @@
+#include <ESP8266WiFi.h>
+
+/* ******************************** */
+/*   CONFIGURATION START            */
+/* ******************************** */
+
+/* USED PINS */
+#define RELAIS_PIN    4   // D2  Relais
+
+/* WLAN SETTINGS */
+const char* WIFI_SSID = "YOUR_WLAN_SSID";
+const char* WIFI_PASSWORD = "YOUR_WLAN_PASSWORD";
+
+IPAddress ip(192, 168, 1, 31);
+IPAddress gateway(192, 168, 1, 1);
+IPAddress subnet(255, 255, 255, 0);
+
+/* ******************************** */
+/*   CONFIGURATION END              */
+/* ******************************** */
+
+String sGetstart = "GET ";
+WiFiServer server(80);
+WiFiClient client;
+
+/**
+ * default initialization
+ */
+void setup() {
+  pinMode(RELAIS_PIN, OUTPUT);
+  digitalWrite(RELAIS_PIN, HIGH);
+
+  Serial.begin(9600);
+  delay(1);
+
+  WiFi.mode(WIFI_STA);
+  WiFiStart();
+}
+
+
+/**
+ * Main-Loop
+ */
+void loop() {
+  if (WiFi.status() != WL_CONNECTED) {
+    Serial.println("WiFi restart");
+    WiFiStart();
+  }
+
+  if (waitForClient()) {
+    String request = client.readStringUntil('\r');
+    client.flush();
+
+    if (request != "") {
+      Serial.print("Request: ");
+      Serial.println(request);
+
+      if(validateUrl(getUrlPath(request))) {
+        showWebsite(handleWebRequest(getUrlParams(request)));
+      }
+    }
+
+    client.stop();
+  }
+  delay(1);
+}
+
+
+/**
+ * Shift relais for 1 second
+ */
+void shiftRelais(){
+  digitalWrite(RELAIS_PIN, LOW);
+  delay(1000);
+  digitalWrite(RELAIS_PIN, HIGH);
+}
+
+/**
+ * handle single url-parameter
+ */
+boolean handleUrlParameter(String paramString){
+  int splitIndex = paramString.indexOf("=");
+  String pName = paramString.substring(0,splitIndex);
+  String pValue = paramString.substring(splitIndex+1);
+
+  Serial.print(pName);
+  Serial.print(" = ");
+  Serial.println(pValue);
+
+  if(pName=="shift"){
+    Serial.println("Schalte-Relais");
+    shiftRelais();
+    return true;
+  }
+  return false;
+}
+
+/**
+ * split url and handle the parameter
+ */
+boolean handleWebRequest(String request){
+  int startIndex = request.indexOf("?")>=0?request.indexOf("?")+1:(request.indexOf("/")>=0?request.indexOf("/")+1:0);
+  boolean handled = false;
+
+  int i = 0;
+  while(startIndex>=0 && request.length()>0){ // && request.indexOf("=")>=0
+    request = request.substring(startIndex);
+    int endIndex = request.indexOf("&")>=0?request.indexOf("&"):(request.indexOf(" ")>=0?request.indexOf(" "):request.length());
+    String splitString = request.substring(0, endIndex);
+    Serial.println(splitString);
+
+    if(handleUrlParameter(splitString)){
+      handled = true;
+    }
+
+    startIndex = request.indexOf("&")>=0?request.indexOf("&")+1:-1;
+    i++;
+  }
+  return handled;
+}
+
+/**
+ * get Paramss from Request-URL
+ */
+String getUrlParams(String request){
+  String sParam = "";
+
+  int iStart, iEndSpace, iEndQuest;
+  iStart = request.indexOf(sGetstart);
+  if (iStart >= 0) {
+    iStart += +sGetstart.length();
+    iEndSpace = request.indexOf(" ", iStart);
+    iEndQuest = request.indexOf("?", iStart);
+
+    if (iEndSpace > 0) {
+      if (iEndQuest > 0) {
+        sParam = request.substring(iEndQuest, iEndSpace);
+      }  
+    }        
+  }
+  return sParam;
+}
+
+/**
+ * get Path from Request-URL
+ */
+String getUrlPath(String request){
+  String sPath = "";
+  int iStart, iEndSpace, iEndQuest;
+  iStart = request.indexOf(sGetstart);
+
+  if (iStart >= 0) {
+    iStart += +sGetstart.length();
+    iEndSpace = request.indexOf(" ", iStart);
+    iEndQuest = request.indexOf("?", iStart);
+
+    if (iEndSpace > 0) {
+      sPath = request.substring(iStart, iEndQuest>0?iEndQuest:iEndSpace);
+    }        
+  }
+  return sPath;
+}
+
+
+/**
+ * Wait for Webclient connection
+ */
+boolean waitForClient() {
+  client = server.available();
+  if (!client) {
+    return false;
+  }
+
+  Serial.println("new client");
+  unsigned long timeout = millis() + 250;
+  while (!client.available() && (millis() < timeout) ) {
+    delay(1);
+  }
+
+  if (millis() > timeout) {
+    Serial.println("client timed out!");
+    return false;
+  }
+
+  return true;
+}
+
+/**
+ * Check for valid URL 
+ * else show 404 error page
+ */
+boolean validateUrl(String urlPath){
+  if (urlPath != "/" && urlPath != "/rawCmd") {
+    String httpResponse, httpHeader;
+    httpResponse = "<html><head><title>404 Not Found</title></head><body><h1>Requested URL  not found.</h1>";
+    httpResponse += "Dieses Gerät unterstützt keine Unterseiten in der URL. <br/>";
+    httpResponse += "Zum schalten des Relais muss der Parameter 'shift' in der URL angegeben sein.<br/><br/>";
+    httpResponse += "<b>Beispiel:</b><br/>http://";  
+    httpResponse += ip[0];
+    httpResponse += ".";  
+    httpResponse += ip[1];
+    httpResponse += ".";  
+    httpResponse += ip[2];
+    httpResponse += ".";  
+    httpResponse += ip[3];
+    httpResponse += "/?shift";  
+
+    httpResponse += "</body></html>";
+
+    httpHeader  = "HTTP/1.1 404 Not found\r\n";
+    httpHeader += "Content-Length: ";
+    httpHeader += httpResponse.length();
+    httpHeader += "\r\n";
+    httpHeader += "Content-Type: text/html\r\n";
+    httpHeader += "Connection: close\r\n";
+    httpHeader += "\r\n";
+
+    client.print(httpHeader);
+    client.print(httpResponse);
+
+    return false;
+  }
+
+  return true;
+}
+
+/**
+ * Show default website
+ */
+void showWebsite(boolean handledParameter){
+  String httpResponse, httpHeader;
+
+  httpResponse  = "<html><head><title>Demo f&uumlr ESP8266 Steuerung</title></head><body>";
+  httpResponse += "<font color=\"#ffffff\"><body bgcolor=\"#000000\">";
+  httpResponse += "<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0, user-scalable=yes\">";
+  httpResponse += "<h1>SmartHome yourself - Garagentor-Controller</h1><br/><br/>";
+  if(handledParameter){
+    httpResponse += "Der Schaltbefehl wurde ausgef&uuml;hrt.";
+  } else {
+    httpResponse += "Zum schalten des Relais muss der Parameter 'shift' in der URL angegeben sein.<br/><br/>";
+    httpResponse += "<b>Beispiel:</b><br/>http://";  
+    httpResponse += ip[0];
+    httpResponse += ".";  
+    httpResponse += ip[1];
+    httpResponse += ".";  
+    httpResponse += ip[2];
+    httpResponse += ".";  
+    httpResponse += ip[3];
+    httpResponse += "/?shift";  
+  }
+  httpResponse += "</body></html>";
+
+  httpHeader  = "HTTP/1.1 200 OK\r\n";
+  httpHeader += "Content-Length: ";
+  httpHeader += httpResponse.length();
+  httpHeader += "\r\n";
+  httpHeader += "Content-Type: text/html\r\n";
+  httpHeader += "Connection: close\r\n";
+  httpHeader += "\r\n";
+
+  client.print(httpHeader);
+  client.print(httpResponse);
+}
+
+/**
+ * Initialize WiFi
+ */
+void WiFiStart() {
+  Serial.println();
+  Serial.print("Connecting to ");
+  Serial.println(WIFI_SSID);
+
+  WiFi.mode(WIFI_STA);
+  WiFi.config(ip, gateway, subnet);
+  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  Serial.println("");
+  Serial.println("WiFi connected");
+
+  server.begin();
+
+  Serial.println(WiFi.localIP());
+}
+