How to write to the OLED in WiFi Lora V2 kit from Heltec

mylora_wifi_oled

#include <WiFi.h>
#include <U8x8lib.h>
// #include <LoRa.h>

// the OLED used
U8X8_SSD1306_128X64_NONAME_SW_I2C u8x8(/* clock=*/ 15, /* data=*/ 4, /* reset=*/ 16);

int linecounter = 0;

void myu8x8_print(const char *line) {
      char myline[30];
      sprintf(myline, "%s   ", line);
      u8x8.drawString(0, linecounter, myline);
      linecounter+=1;
      if (linecounter>7)
        linecounter=0;
}

void setup()
{
  Serial.begin(115200);

  // Set WiFi to station mode and disconnect from an AP if it was previously connected
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();
  delay(100);

  Serial.println("Setup done");

  u8x8.begin();
  u8x8.setFont(u8x8_font_chroma48medium8_r);
  myu8x8_print("WiFiScan from Peter Teoh");

}

void loop()
{
  Serial.println("scan start");
  myu8x8_print("Start");

  // WiFi.scanNetworks will return the number of networks found
  int n = WiFi.scanNetworks();
  Serial.println("scan done");
  myu8x8_print("Scan done");

  if (n == 0) {
    Serial.println("no networks found");
    myu8x8_print("No network");

  } else {
    Serial.print(n);
    Serial.println(" networks found");
    for (int i = 0; i < n; ++i) {
      // Print SSID and RSSI for each network found
      Serial.print(i + 1);
      Serial.print(": ");
      Serial.print(WiFi.SSID(i));
      myu8x8_print(WiFi.SSID(i).c_str());
      Serial.print(" (");
      Serial.print(WiFi.RSSI(i));
      Serial.print(")");
      Serial.println((WiFi.encryptionType(i) == WIFI_AUTH_OPEN) ? " " : "*");
      delay(10);
    }
  }
  Serial.println("");

  // Wait a bit before scanning again
  delay(5000);
}