wemos webserver for relays (digital out, switch D1,D2,D3,D4)

arduino_d1_mini_relay_server.ino

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>

const char* ssid = "my_SSID";
const char* password = "my_PASSWORD";

/*
usage:
http://device_ip/schalten/k1/state
http://device_ip/schalten/k1/0
http://device_ip/schalten/k1/1
http://device_ip/schalten/k1/toggle
most of the code taken from a arduino example :)
its a quick and dirty solution, i know it would be very easy to optimize - ain't nobody got time for this.
*/

ESP8266WebServer server(80);

char relais;
char state;

void handleRoot() {
  server.send(200, "text/plain", "PST-BKZ-FL: ready");
}

void handleNotFound(){
  String message = "File Not Found\n\n";
  message += "URI: ";
  message += server.uri();
  message += "\nMethod: ";
  message += (server.method() == HTTP_GET)?"GET":"POST";
  message += "\nArguments: ";
  message += server.args();
  message += "\n";
  for (int i=0; i<server.args(); i++){
    message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
  }
  server.send(404, "text/plain", message);

}

void schalten(int thePin, int to_state){
  Serial.println("");
  digitalWrite(thePin, to_state);
  Serial.print(thePin);
  Serial.print(" auf ");
  Serial.print(to_state);
  Serial.print(" schalten");
  Serial.println("");
}

int check_status(int thePin){
return digitalRead(thePin);
}

void setup(void){

  Serial.begin(115200);
  WiFi.begin(ssid, password);
  Serial.println("");
  
  pinMode(D1, OUTPUT);
  pinMode(D2, OUTPUT);
  pinMode(D3, OUTPUT);
  pinMode(D4, OUTPUT);

  Serial.print("OUTPUTS: D1,D2,D3,D4");
  
  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  if (MDNS.begin("esp8266")) {
    Serial.println("MDNS responder started");
  }

  server.on("/", handleRoot);

  server.on("/inline", [](){
    server.send(200, "text/plain", "this works as well");
  });

server.on("/schalten/k1/state", [](){
    if(check_status(D1)) {server.send(200, "text/plain", "1");} else {server.send(200, "text/plain", "0");}
});

server.on("/schalten/k1/1", [](){
    schalten(D1, 1);
    server.send(200, "text/plain", "schalte k1");
});

server.on("/schalten/k1/0", [](){
    schalten(D1, 0);
    server.send(200, "text/plain", "schalte k1");
});

server.on("/schalten/k1/toggle", [](){
    if(check_status(D1)) {schalten(D1, 0);} else {schalten(D1, 1);}
    server.send(200, "text/plain", "schalte k1");
});



server.on("/schalten/k2/state", [](){
    if(check_status(D2)) {server.send(200, "text/plain", "1");} else {server.send(200, "text/plain", "0");}
});

server.on("/schalten/k2/1", [](){
    schalten(D2, 1);
    server.send(200, "text/plain", "schalte k2");
});

server.on("/schalten/k2/0", [](){
    schalten(D2, 0);
    server.send(200, "text/plain", "schalte k2");
});

server.on("/schalten/k2/toggle", [](){
    if(check_status(D2)) {schalten(D2, 0);} else {schalten(D2, 1);}
    server.send(200, "text/plain", "schalte k2");
});



server.on("/schalten/k3/state", [](){
    if(check_status(D3)) {server.send(200, "text/plain", "1");} else {server.send(200, "text/plain", "0");}
});

server.on("/schalten/k3/1", [](){
    schalten(D3, 1);
    server.send(200, "text/plain", "schalte k3");
});

server.on("/schalten/k3/0", [](){
    schalten(D3, 0);
    server.send(200, "text/plain", "schalte k3");
});

server.on("/schalten/k3/toggle", [](){
    if(check_status(D3)) {schalten(D3, 0);} else {schalten(D3, 1);}
    server.send(200, "text/plain", "schalte k3");
});


server.on("/schalten/k4/state", [](){
    if(check_status(D4)) {server.send(200, "text/plain", "1");} else {server.send(200, "text/plain", "0");}
});

server.on("/schalten/k4/1", [](){
    schalten(D4, 1);
    server.send(200, "text/plain", "schalte k4");
});

server.on("/schalten/k4/0", [](){
    schalten(D4, 0);
    server.send(200, "text/plain", "schalte k4");
});

server.on("/schalten/k4/toggle", [](){
    if(check_status(D4)) {schalten(D4, 0);} else {schalten(D4, 1);}
    server.send(200, "text/plain", "schalte k4");
});



  server.onNotFound(handleNotFound);

  server.begin();
  Serial.println("HTTP server started");
}

void loop(void){
  server.handleClient();
}