RadioHead rf95.lastRssi() to String

Projects Programming
3

Actually I‘d like to print this RSSI value on an OLED Display. For that I need this value as a String.

Serial.print(rf95.lastRssi(), DEC);  // -20

Int iRssi = (rf95.lastRssi(), DEC);   
String sRssi = String((rf95.lastRssi(), DEC));

Serial.println(iRssi);   // 10
Serial.println(sRssi);   // 10

u8g2.firstPage();
    
do {  
  u8g2.setFont(u8g2_font_7x14_mf);               
  u8g2.drawStr(0, 15, sRssi.c_str());    // 10
} while (u8g2.nextPage());