import network
from umqtt.simple import MQTTClient
import time
import sys
import os
import json

# configure your wifi credentials
WIFI_SSID = "<YOUR_WIFI_SSID_GOES_HERE>"
WIFI_PASS = "<YOUR_WIFI_PASSWORD_GOES_HERE>"

# configure your iot credentials
MQTT_ENDPOINT = "XXXXXX.iot.XXXXX.amazonaws.com"
MQTT_PORT = 8883
MQTT_QOS = 0
# thing-id
MQTT_CLIENT = "mycore2"

THING_CLIENT_CERT = "/flash/res/core2-certificate.pem.crt"
THING_PRIVATE_KEY = "/flash/res/core2-private.pem.key"

# topic
MQTT_TOPIC = "mycore2/env"
MQTT_SUB_TOPIC = "mycore2/command"

info = os.uname()

def connect_to_wifi(ssid, password):
    sta_if = network.WLAN(network.STA_IF)
    if not sta_if.isconnected():
        sta_if.active(True)
        sta_if.connect(ssid, password)
        while not sta_if.isconnected():
            pass
    ip_address = sta_if.ifconfig()[0]
    return ip_address

def get_key(key_path):
    with open(key_path, "r") as f:
        key = f.read()
    return key

def connect_to_mqtt():
    print("CONNECTING TO MQTT BROKER...")
    global client
    client = MQTTClient(
        client_id=MQTT_CLIENT,
        server=MQTT_ENDPOINT,
        port=MQTT_PORT,
        keepalive=0,
        ssl=True,
        ssl_params={
            "cert": get_key(THING_CLIENT_CERT),
            "key": get_key(THING_PRIVATE_KEY),
            "server_side": False
        }
    )
    client.set_callback(subscription_call_back)
    try:
        client.connect()
        print("MQTT BROKER CONNECTION SUCCESSFUL")
    except Exception as e:
        print("MQTT CONNECTION FAILED: {}".format(e))
        sys.exit()
    client.subscribe(MQTT_SUB_TOPIC)
    print("SUBSCRIBED TO TOPIC: {}".format(MQTT_SUB_TOPIC))
    return

def subscription_call_back(topic, msg):
    # confirm state update
    print("RECEIVING MESSAGE: {} FROM TOPIC: {}".format(
        msg.decode("utf-8"), topic.decode("utf-8")))
    return

def publish_message(topic, msg, qos=MQTT_QOS):
    client.publish(
        topic=topic,
        msg=msg,
        qos=qos)
    print("PUBLISHING MESSAGE: {} TO TOPIC: {}".format(msg, topic))
    return

# connect to wifi
print("CONNECTING TO WIFI NETWORK")
ip_address = connect_to_wifi(WIFI_SSID, WIFI_PASS)
print("CONNECTED SUCCESSFULLY")
print("YOUR IP ADDRESS IS: {}".format(ip_address))

# connect to mqtt
print("CONNECTING TO MQTT BROKER")
connect_to_mqtt()
print("SUBSCRIBED TO TOPIC")
while True:
    client.check_msg()

    tf = power.getTempInAXP192()
    msg = str(json.dumps({
        "client": MQTT_CLIENT,
        "device": {
            "uptime": time.ticks_ms(),
            "hardware": info[0],
            "firmware": info[2]
        },
        "sensors": {
            "TempInAXP192": tf
        },
        "status": "online",
    }))
    publish_message(MQTT_TOPIC, msg)
    time.sleep(5)

Adafruit Crypto library

waiting for that MicroPython package specific for the Core2 for AWS... When?

The crypto module isn't supported. However, you can use the Adafruit Crypto library for the secure element.

M5Stack and AWS are working together to explore an option to deliver a MicroPython package specifically for the Core2 for AWS IoT EduKit.