SSD1306 doesn't work on ESP32?

But, the initial action of SPI and Graphics module must be in the onInit() function. why?
And the RST pin must be connected! The cs option must be defined too.

because connectSPI send some init commands to make the OLED work correct.

....  
setTimeout(function() {
    // configure the OLED
    initCmds.forEach(function(d) {i2c.writeTo(addr, [0,d]);});;
  }, 50);
....