// #include <HardwareSerial.h>


void setup() 
{ 
  Serial.begin(115200);
   delay(500); 
   
    // Serial.begin(115200, SERIAL_8N1, 18, 17);
    delay(500);
      Serial.println("ATI"); 
      delay(100); 
      update_serial();
       Serial.println("AT+CSQ"); 
       delay(100); update_serial();
        Serial.println("AT+CIMI"); 
        delay(100); update_serial(); 
        pinMode(2,OUTPUT);digitalWrite(2,HIGH);
         sent_sms(); 
         } 

void loop() 
{
   if (Serial.available())
   { char c = Serial.read();
    Serial.write(c); 
    }
     update_serial(); } 
     void update_serial()
      { 
        if (Serial.available()) 
        { Serial.write(Serial.read());
         }
          }
           void sent_sms() 
           { Serial.println("AT+CMGF=1");
           delay(500);
            Serial.println("AT+CMGS=\"+40730002825\"");
            delay(500); 
            Serial.print("test sent sms SIM7600");
            delay(500);
             Serial.write(26);
             delay(500); 
             }