USBSerial in the Portenta Machine control

Mbed OS
1

Hi, new here. I am trying to establish a Serial communication over USB-A port in the Portenta Machine Control. I came across this and this link like more or less what i am looking for. But which one i can use to make the communication/connection work. I have USB-TTL module with me, so i can test with this module whether some dummy data is transmitting(TX) or receiving(RX) with the help of noticing the led indication in the module. Also i tried to do establish the communication, did not work out.
arduino code

#include <mbed.h>
#include <USBSerial.h>
#include "greentea-client/test_env.h"

#define MSG_VALUE_DUMMY "0"
#define CDC_LOOPBACK_REPS 1200
#define SERIAL_LOOPBACK_REPS 100
#define MSG_KEY_PORT_OPEN_WAIT "port_open_wait"
#define USB_DEV_SN_LEN (32)
char usb_dev_sn[USB_DEV_SN_LEN + 1];

USBSerial cdc(true, 0x10c4, 0xea60, 0x0001);

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

}

void loop() {
  cdc.configured();
  cdc.ready();

  cdc.connect();
  while(!cdc.configured()){
    Serial.println("cdc not configured");
    delay(1);
  }

  greentea_send_kv(MSG_KEY_PORT_OPEN_WAIT, MSG_VALUE_DUMMY);

  cdc.wait_ready();
  uint8_t rx_buff, tx_buff;
  for(int i = 0; i < CDC_LOOPBACK_REPS; i++){
    tx_buff = static_cast<uint8_t>(rand() % 0x100);
    rx_buff = static_cast<uint8_t>(tx_buff + 1);
    cdc.send(&tx_buff, 1);
    Serial.println("Sending: %02X\n");
    if (tx_buff < 0x10) Serial.print("0"); 
      Serial.println(tx_buff, HEX);
    cdc.receive(&rx_buff, 1, NULL);
    assert(tx_buff== rx_buff);
    Serial.print("Received: 0x");
    if (rx_buff < 0x10) Serial.print("0");
    Serial.println(rx_buff, HEX); 
   
  }
  cdc.disconnect();

  Serial.println("Hello world");
  delay(1000);
}

Nothing happening, and nothing in the serial monitor. I am kinda lost. If someone help me with this, it will be so helpful. Thanks in Advance