// Load Wi-Fi library
#include <ESP8266WiFi.h>

// Replace with your network credentials
const char* ssid     = "mySSID";
const char* password = "VerySecret";

// Set web server port number to 80
WiFiServer server(80);

// Variable to store the HTTP request
String header;

// Auxiliary variables to store the current output state
String relayState = "OFF";
// we will have the relay on 5
const int relay = 5;


void setup() {
  Serial.begin(115200);
  // Initialize the output variables as outputs
  pinMode(relay, OUTPUT);
  // set the relay off by default
  digitalWrite(relay, LOW);
  pinMode(LED_BUILTIN, OUTPUT);     // Initialize the LED_BUILTIN pin as an output
  // we match the LED state to the relay state
  digitalWrite(LED_BUILTIN, HIGH);  // High is off, low is on

  // Connect to Wi-Fi network with SSID and password
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  // Print local IP address and start web server
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  server.begin();
}
void loop(){
  WiFiClient client = server.available();   // Listen for incoming clients

  if (client) {                             // If a new client connects,
    Serial.println("New Client.");          // print a message out in the serial port
    String currentLine = "";                // make a String to hold incoming data from the client
    while (client.connected()) {            // loop while the client's connected
      if (client.available()) {             // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
        Serial.write(c);                    // print it out the serial monitor
        header += c;
        if (c == '\n') {                    // if the byte is a newline character
          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/plain");
            client.println("Connection: close");


            // turns the GPIOs on and off
            if (header.indexOf("GET /relay/on") >= 0) {
              Serial.println("Relay on");
              relayState = "ON";
              digitalWrite(LED_BUILTIN, LOW);  // High is off, low is on
              digitalWrite(relay, HIGH);
            } else if (header.indexOf("GET /relay/off") >= 0) {
              Serial.println("Relay off");
              relayState = "OFF";
              digitalWrite(relay, LOW);
              digitalWrite(LED_BUILTIN, HIGH);  // High is off, low is on
            }
            else if (header.indexOf("GET /relay/status") >= 0) {
              Serial.print("Sending status: ");
              Serial.println(relayState);
              
              client.println();
              client.print(relayState);
              client.println();
              
            }
            client.println();
            break;
          } else { // if you got a newline, then clear currentLine
            currentLine = "";
          }
        } else if (c != '\r') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }
      }
    }
    // Clear the header variable
    header = "";
    // Close the connection
    delay(1);
    client.stop();
    Serial.println("Client disconnected.");
    Serial.println("");
  }
}        
  

Switch MyRelay "MyRelay" <switch> ( gSwitches, gRelay ) { http=">[ON:GET:http://<IP Address>/relay/on] >[OFF:GET:http://<IP Address>/relay/off] <[http://<IP Address>/relay/status:10000:REGEX((.*))]"}