ESP32 - MQTT to AWS IoT using MicroPython

Question

我已经在AWS物联网上注册了我的ESP32，并下载了相应的证书和公共证书;私有密钥。还通过我的终端中的以下命令验证了这些连接是否正确:

openssl s_client -connect host.iot.region.amazonaws.com:8443 -CAfile AmazonRootCA1.pem -cert certificate.pem.crt -key private.pem.key

这是我的(main.py)简单的代码连接到AWS物联网使用MicroPython

import machine
from network import WLAN
import network
from umqtt.simple import MQTTClient
# AWS endpoint parameters.
HOST = b'HOST'    # ex: b'abcdefg1234567'
REGION = b'REGION'  # ex: b'us-east-1'
CLIENT_ID = "CLIENT_ID"  # Should be unique for each device connected.
AWS_ENDPOINT = b'%s.iot.%s.amazonaws.com' % (HOST, REGION)
keyfile = '/certs/private.pem.key'
with open(keyfile, 'r') as f:
key = f.read()
certfile = "/certs/certificate.pem.crt"
with open(certfile, 'r') as f:
cert = f.read()
# SSL certificates.
SSL_PARAMS = {'key': key,'cert': cert, 'server_side': False}

# Setup WiFi connection.
wlan = network.WLAN( network.STA_IF )
wlan.active( True )
wlan.connect( "SSID", "PASSWORD" )
while not wlan.isconnected():
machine.idle()
# Connect to MQTT broker.
mqtt = MQTTClient( CLIENT_ID, AWS_ENDPOINT, port = 8883, keepalive = 10000, ssl = True, ssl_params = SSL_PARAMS )
mqtt.connect()
# Publish a test MQTT message.
mqtt.publish( topic = 'test', msg = 'hello world', qos = 0 )

但是当我尝试连接时，我得到这个错误:

(-17168, 'MBEDTLS_ERR_RSA_PRIVATE_FAILED+MBEDTLS_ERR_MPI_ALLOC_FAILED')

Answer 1

经过一番努力，我得到了这个工作。我必须使用idf3 MicroPython二进制文件

esp32-idf3-20191220-v1.12.bin

idf4二进制文件和v1.12之后的idf3不工作。堆和内存分配不足的问题。

----------- EDIT -----------

新闻更新!基于idf4的MicroPython的新v1.15版本与AWS MQTT for IoT兼容。