How to integrate rosserial_arduino in an existing sketch?

edit

I made code in just arduino. but i wanna change it to rosserial_arduino code. but i don't know how to do.....

#include <SoftwareSerial.h>

SoftwareSerial hc06(10,11); //Tx, Rx



int total_state = 0;              

int switch_on = 0;             
int switch_rev = 0;          
int switch_on_state = 0;
int switch_rev_state = 0;

int switch_on_pin = 3;            
int switch_rev_pin = 4;           

double emg ;                  
//double temp_max = 27;             
double emg_max = 200;
double pres;                
double pres_max = 150;           

int mydelay = 300;              

int relay_motor_pin = 9;            

int pow_led_pin = 12;
int rev_led_pin = 13;
int baby_mot_pin = 6;
int direct_pin = 7;


unsigned long currentMillis;                
unsigned long previousMillis = 0;          
unsigned long changetime = 0;


//////////////////////



void pumpon(int relay_motor_pin) {
  digitalWrite(relay_motor_pin, HIGH);          
}

void pumpoff(int relay_motor_pin) {
  digitalWrite(relay_motor_pin, LOW);           
}




void pumprev(int LED_REV) {
  digitalWrite(direct_pin,LOW);
  analogWrite(baby_mot_pin,255);
  delay(3000);
  analogWrite(baby_mot_pin,0)
  ;
}


void serial_comu(int MYDELAY, double EMG, double PRES, int TOTAL_STATE, int SWITCH_ON_STATE) {
  currentMillis = millis();
  if (currentMillis - previousMillis > MYDELAY) {
    hc06.print("= EMG = ");
    hc06.print(EMG);
    hc06.print("= PRES = ");
    hc06.print(PRES);
    hc06.print("= total state = ");
    hc06.print(TOTAL_STATE);
    hc06.print("= switch on state=");
    hc06.print(SWITCH_ON_STATE);
    hc06.println(" ");

    previousMillis = currentMillis;
  }
}





////////////////////////////////



void setup() {
  Serial.begin(9600);                 
  pinMode(relay_motor_pin, OUTPUT);
  pinMode(switch_on_pin, INPUT);
  pinMode(switch_rev_pin, INPUT);     
  pinMode(pow_led_pin,OUTPUT);
  pinMode(rev_led_pin,OUTPUT);
  pinMode(baby_mot_pin,OUTPUT);
  pinMode(direct_pin,OUTPUT);
  Serial.println("Enter AT commands:");
  hc06.begin(9600);
}

void loop() {
  if(hc06.available()){
    Serial.write(hc06.read());
  }


  if(Serial.available()){
    hc06.write(Serial.read());
  }

  emg = analogRead(A0);  
  pres = analogRead(A1); 

  switch_on = digitalRead(switch_on_pin);                       
  switch_rev = digitalRead(switch_rev_pin);                    



  if ( (millis() - changetime > 1000) && switch_on_state == LOW && switch_on == HIGH) {
    switch_on_state = HIGH;
    digitalWrite(pow_led_pin,HIGH);                  
    changetime = millis();
  }                                                             
  if ( (millis() - changetime > 1000) && switch_on_state == HIGH && switch_on == HIGH) {
    switch_on_state = LOW;
    digitalWrite(pow_led_pin,LOW);                   //???????????????
    changetime = millis();
  }                                                           
  if ( (millis() - changetime > 1000) && switch_rev_state == LOW && switch_rev == HIGH) {
    switch_rev_state = HIGH;
    digitalWrite(rev_led_pin,HIGH);                  
    changetime = millis();
  }                                                           
  if ( (millis() - changetime > 1000) && switch_rev_state == HIGH && switch_rev == HIGH) {
    switch_rev_state = LOW;
    changetime = millis();
  }                                                           





  if ( (switch_on_state == HIGH) && (emg >= emg_max) && (pres <= pres_max) ) {
    total_state = 1;
  }                                                        

  if (total_state == 1) {
    pumpon(relay_motor_pin);
  }                                                           






  if ( (switch_on_state == LOW) || (pres > pres_max) ) {
    total_state = 0;
  }                                                          
  if (total_state == 0) {
    pumpoff(relay_motor_pin);
  }                                                            



  if (switch_rev_state == HIGH) {
    total_state = 2;                                     
  }
  if (total_state == 2) {
    pumprev(relay_motor_pin);
    digitalWrite(rev_led_pin,LOW);               
    total_state = 0;
    switch_rev_state = LOW;
  }                                                          
  serial_comu(mydelay, emg, pres, total_state, switch_on_state);
}

Edit:

I saw rosserial_arduino tutorials. but i can't understand 100%... i delete bluetooth from code and i made these code

#include <ros.h>
#include <std_msgs/Float32.h>



std_msgs::Float32 EMG_msg;
ros::Publisher pub_EMG("EMG_sensor", &EMG_msg);


ros::NodeHandle  nh;



int total_state = 0;            
int switch_on = 0;            
int switch_rev = 0;            
int switch_on_state = 0;
int switch_rev_state = 0; 

int switch_on_pin = 3;       
int switch_rev_pin = 4;         

double emg ;                
//double temp_max = 27;           
double emg_max =200;
double pres;               
double pres_max = 130;           

int mydelay = 300;              
int led_motor_pin = 9;         

unsigned long currentMillis;             
unsigned long previousMillis = 0;          
unsigned long changetime =0;


//////////////////////



void pumpon(int LED_ON){
digitalWrite(LED_ON,HIGH);
}

void pumpoff(int LED_OFF){
  digitalWrite(LED_OFF,LOW);
}




void pumprev(int LED_REV){

digitalWrite(LED_REV,LOW);
/*  currentMillis=millis();
if(currentMillis-previousMillis>1000){
digitalWrite(LED_REV,HIGH);
previousMillis=currentMillis;
}
currentMillis=millis();*/
delay(500);
digitalWrite(LED_REV,HIGH);
delay(500);
digitalWrite(LED_REV,LOW);
delay(500);
digitalWrite(LED_REV,HIGH);
delay(500);
digitalWrite(LED_REV,LOW);
}                                  


void serial_comu(int MYDELAY, double EMG, double PRES, int TOTAL_STATE, int SWITCH_ON_STATE){
    currentMillis=millis();
if(currentMillis-previousMillis>MYDELAY ...