cannot connect to aws iot using umqtt.simple

simple1.py の 92 行目にある connect と、MQTT バイトの送信後に空のレスポンスを示しているデバッグ出力から始めます。提供されている AWS IoT 設定で接続試行を再現し、その後レスポンス処理を追跡して失敗の原因を特定します。原因が確認され、接続の成功が実証されるか、必要なセットアップが文書化されれば完了です。

My code

import time
import machine
import network
import ujson
from simple1 import MQTTClient

SSID = b'Exxxye'
PASS = b'8xxx766'
CLIENT_ID = b'ixxxxxxxxxxxx6eb63'
AWS_ENDPOINT = b'xxxxx-1.amazonaws.com'

PUB_TOPIC = b'temperature'
SUB_TOPIC = b'temperature'
with open('/pri.der', 'rb') as f:
    DEV_KEY = f.read()

with open('/cert.der', 'rb') as f:
    DEV_CRT = f.read()

light = machine.Pin("LED", machine.Pin.OUT)
light.off()


def wifi_connect():
    print('Connecting to wifi...')
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(SSID, PASS)
    while wlan.isconnected() == False:
        light.on()
        print('Waiting for connection...')
        time.sleep(0.5)
        light.off()
        time.sleep(0.5)
    print('Connection details: %s' % str(wlan.ifconfig()))

def mqtt_subscribe_callback(topic, msg):
    print("Received topic: %s message: %s" % (topic, msg))
    if topic == SUB_TOPIC:
        mesg = ujson.loads(msg)
        if 'state' in mesg.keys():
            if mesg['state'] == 'on' or mesg['state'] == 'ON' or mesg['state'] == 'On':
                light.on()
                print('Light is ON')
            else:
                light.off()
                print('Light is OFF')

def get_rpi_temperature():
    sensor = machine.ADC(4)
    voltage = sensor.read_u16() * (3.3 / 65535)
    temperature = 27 - (voltage - 0.706) / 0.001721
    return temperature


wifi_connect()


mqtt = MQTTClient(
    client_id=CLIENT_ID,
    server=AWS_ENDPOINT,
    port=8883,
    keepalive=120,
    ssl=True,
    ssl_params={'key':DEV_KEY, 'cert':DEV_CRT, 'server_side':False})

mqtt.connect()

mqtt.set_callback(mqtt_subscribe_callback)


mqtt.subscribe(SUB_TOPIC)

while True:
message = b'{"temperature":%s, "temperature_unit":"Degrees Celsius"}' % get_rpi_temperature()
    print('Publishing topic %s message %s' % (PUB_TOPIC, message))

    mqtt.publish(topic=PUB_TOPIC, msg=message, qos=1)

    # Check subscriptions for message
    mqtt.check_msg()
    time.sleep(5)

My error code:

Connecting to wifi...
Connection details: ('192.168.x.xx', '255.255.255.0', '192.168.xx.xx', '192.168.xx.xx')
dbug-msg: 0x9 b'04:4d:51:54:54:04:02:00:78'
dbug-resp: b''
Traceback (most recent call last):
File "", line 81, in
File "simple1.py", line 92, in connect
IndexError: bytes index out of range

please someone help me on this..i tried everything