WFH messaging system code for Particle Photon

wfhmessaging.ino

// WFH Messaging system.
// Modified version of code provided by particle.io documentation.
// Use at your own risk.

int led0 = D0;
int led1 = D1;
int led2 = D2;
int led3 = D3;
int led4 = D4;
int buzzer = D5;

void setup()
{
   // set pins connected to LEDs and buzzer as outputs
   pinMode(led0, OUTPUT);
   pinMode(led1, OUTPUT);
   pinMode(led2, OUTPUT);
   pinMode(led3, OUTPUT);
   pinMode(led4, OUTPUT);
   pinMode(buzzer, OUTPUT);

   // We are also going to declare a Particle.function so that we can turn the LEDs on and off from the cloud.
   Particle.function("led",ledToggle);
   // This is saying that when we ask the cloud for the function "led", it will employ the function ledToggle() from this app.

   // Turn off LEDs upon reset
   digitalWrite(led0, LOW);
   digitalWrite(led1, LOW);
   digitalWrite(led2, LOW);
   digitalWrite(led3, LOW);
   digitalWrite(led4, LOW);
   digitalWrite(buzzer, LOW);
}

void loop()
{
   // Nothing to do here as waiting for text from control webpage
}

void soundAlert()
{
    digitalWrite(buzzer, HIGH);
    delay(1000);
    digitalWrite(buzzer, LOW);
}

void coffeeAlert()
{
    for (int i=0; i<5; i++)
    {
        digitalWrite(buzzer, HIGH);
        delay(100);
        digitalWrite(buzzer, LOW);
        delay(100);
    }
}

void waterAlert()
{
    for (int i=0; i<2; i++)
    {
        digitalWrite(buzzer, HIGH);
        delay(500);
        digitalWrite(buzzer, LOW);
        delay(100);
    }
}


int ledToggle(String command) {
// function receives a string from control webpage (the commands such as D0On) and acts on them

    if (command=="D0On") {
        digitalWrite(led0,HIGH); // in a meeting - DND
        digitalWrite(led1,LOW); // turn off working alone LED
        digitalWrite(led4,LOW); // turn off finished for the day LED
        soundAlert();
        return 1;
    }
    else if (command=="D1On") {
        digitalWrite(led1,HIGH); // working alone
        digitalWrite(led0,LOW);  // turn off DND LED
        digitalWrite(led4,LOW); // turn off finished for the day LED        
        soundAlert();        
        return 0;
    }
     else if (command=="D2On") {
        digitalWrite(led2,HIGH); // coffee request
        coffeeAlert();        
        delay(2000); 
        digitalWrite(led2,LOW); 
        return 0;
    }
     else if (command=="D3On") {
        digitalWrite(led3,HIGH); // water request
        waterAlert();        
        delay(2000); 
        digitalWrite(led3,LOW); 
        return 0;
    }    
     else if (command=="D4On") {
        digitalWrite(led4,HIGH); // finished for the day
        digitalWrite(led0,LOW);  // cancel DND LED if on
        digitalWrite(led1,LOW);  // cancel working alone LED if on
        soundAlert();
        return 0;
    }      
    
    else {
        return -1;
    }
}