facing connecting ESP32 with my adafruit IO using umqtt

[vgtronics23012004]

i am using micropython for ESP32
using umqtt for subscribing a feed on Adafruit IO
but i am getting an error :

this is my code :

`from machine import Pin
import network
import time
from umqtt.robust import MQTTClient
import sys

led=Pin(2,Pin.OUT) # Onboard LED on Pin 2 of ESP32

WIFI_SSID = 'DLINK214_1'
WIFI_PASSWORD = 'vishal@270898'

mqtt_client_id = bytes('client_'+'1233', 'utf-8') # Just a random client ID

ADAFRUIT_IO_URL = 'io.adafruit.com'
ADAFRUIT_USERNAME = 'vgtronics2301xxxx'
ADAFRUIT_IO_KEY = 'aio_YLRt18bsCnXXXXXXXXXXXXXXX' # hide for security reason

TOGGLE_FEED_ID = 'homeautomation'

def connect_wifi():
wifi = network.WLAN(network.STA_IF)
wifi.active(True)
wifi.disconnect()
wifi.connect(WIFI_SSID,WIFI_PASSWORD)
if not wifi.isconnected():
print('connecting..')
timeout = 0
while (not wifi.isconnected() and timeout < 5):
print(5 - timeout)
timeout = timeout + 1
time.sleep(1)
if(wifi.isconnected()):
print('connected')
else:
print('not connected')
sys.exit()

connect_wifi() # Connecting to WiFi Router

client = MQTTClient(client_id=mqtt_client_id,
server=ADAFRUIT_IO_URL,
user=ADAFRUIT_USERNAME,
password=ADAFRUIT_IO_KEY,
ssl=False)

def cb(topic, msg): # Callback function
print('Received Data: Topic = {}, Msg = {}'.format(topic, msg))
recieved_data = str(msg,'utf-8') # Recieving Data
if recieved_data=="1":
led.value(1)
if recieved_data=="0":
led.value(0)

client.connect()
toggle_feed = bytes('{:s}/feeds/{:s}'.format(ADAFRUIT_USERNAME, TOGGLE_FEED_ID), 'utf-8') # format - techiesms/feeds/relay1
client.set_callback(cb) # Callback function
client.subscribe(toggle_feed) # Subscribing to particular topic

while True:
try:
client.check_msg() # non blocking function
except :
client.disconnect()
sys.exit()`

And my error is :

sometimes this -

>>> %Run -c $EDITOR_CONTENT connected Traceback (most recent call last): File "<stdin>", line 63, in <module> File "umqtt/simple.py", line 108, in connect IndexError: bytes index out of range

and sometimes -

>>> %Run -c $EDITOR_CONTENT connected Traceback (most recent call last): File "<stdin>", line 54, in <module> File "umqtt/simple.py", line 68, in connect OSError: [Errno 118] EHOSTUNREACH

when i am runnign this same code with nodemcu it is working fine
but showing error with esp32
dont know why...
😞

https://github.com/micropython/micropython-lib/blob/6d2c0019e7d109e8ca18d9eab7133f2a49f2144f/umqtt.simple/umqtt/simple.py#L108