MicroPython WebREPL with IP address on OLED and screen saver function

boot.py

# Enable MicroPython WebREPL (Console over Websockets)
from machine import Pin, SoftI2C
from ssd1306 import SSD1306_I2C
from network import WLAN, STA_IF
from webrepl import start
from netcfg import AP_NAME, AP_PASS, WEBREPL_PASS
from ubinascii import a2b_base64
from time import sleep

i2c = SoftI2C(scl=Pin(4), sda=Pin(5))  # Wemos board with built-in OLED uses pins 4 (clock) & 5 (data)
oled = SSD1306_I2C(128, 64, i2c)
oled.fill(0)
oled.show()

wlan = WLAN(STA_IF)
wlan.active(True)
print("Connecting to wifi...")
oled.text('Connecting...', 0, 0)
oled.show()

if not wlan.isconnected():
    wlan.connect(AP_NAME, a2b_base64(AP_PASS).decode('utf8'))
    while not wlan.isconnected():
        pass

start(password=a2b_base64(WEBREPL_PASS).decode('utf8'))
oled.text(wlan.ifconfig()[0], 0, 12)
oled.show()

main.py

# Blank the OLED screen after a bit of time to save battery and avoid burn-in.
from machine import Timer

screen_timeout = 30000  # In milliseconds

def clearScreen(screen_timer):
    oled.fill(0)  # oled was created in boot.py
    oled.show()

screen_timer = Timer(0)
screen_timer.init(period=screen_timeout, mode=Timer.ONE_SHOT, callback=clearScreen)

netcfg.py

# Passwords are base64 encoded.
# *** Encoding is not the same as encryption! ***
# Encoding is used here to avoid casual, over the shoulder password leaks.
# Encode password values with:
# >>> from ubinascii import b2a_base64
# >>> print(b2a_base64('PlainTextPassword').decode('utf8'))
AP_NAME = 'RickRoll'
AP_PASS = 'TmV2ZXJHb25uYUdpdmVZb3VVcA=='
WEBREPL_PASS = 'TmV2ZXI='