ESP32 - 使用MicroPython将MQTT传输到AWS IoT

Question

我已经在AWS IoT上将我的ESP32注册为一个物体，并下载了相应的证书和公/私钥。并通过终端中的以下命令验证了它们可以正确连接：

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）简单代码，使用MicroPython连接到AWS IoT：

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，出现了这个错误：

(-17168, 'MBEDTLS_ERR_RSA_PRIVATE_FAILED+MBEDTLS_ERR_MPI_ALLOC_FAILED')

- zegulas

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你搞定了吗？我也遇到了同样的问题，但一直找不到解决方案。 - stanely

Answer 1

经过很多努力，我终于让它工作了。我不得不使用idf3 MicroPython二进制文件。

esp32-idf3-20191220-v1.12.bin

idf4二进制文件和idf3 v1.12之后的版本无法正常工作。存在堆内存不足和内存分配问题。

----------- 编辑 -----------

最新消息！基于idf4的MicroPython新版本v1.15可以与AWS MQTT for IoT一起使用。

- stanely