help on communication through usb host shield

Hello all,

I want to commicate with a device by sending and receiving some strings through usb host shield.

I want to follow the same protocole below and replace serial3 by "usb host", but I don't know how can I do this:

void setup() {
  Serial.begin(9600);
  Serial3.begin(9600,SERIAL_8N1);
}

void loop() {
  if(Serial.available()){
    Serial3.write(Serial.read());
  }
  if(Serial3.available()){
    Serial.print(Serial3.read());
  }

}

Thanks in advance.

I want to commicate with a device by sending and receiving some strings through usb host shield.

What makes you think that that is appropriate?