如何解决micropython - ESP32 - MQTT 异常 4 - 谷歌云物联网
我希望使用 micropython 通过 ESP32 板将传感器数据发送到 Google IoT Cloud。
我在这里找到了一个实现示例:https://nihal-pasham.medium.com/you-could-try-freezing-the-pyasn-1-9afd6533cd7a
但它抛出以下错误消息:
Traceback (most recent call last):
File "main.py",line 50,in <module>
File "main.py",line 44,in get_mqtt_client
File "umqtt/simple.py",line 99,in connect
MQTTException: 4
这是我正在使用的板: https://www.amazon.com/gp/product/B0718T232Z/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
这是我使用的 micropython 版本: esp32-idf3-20200902-v1.13.bin
这是我的代码:
from third_party import rsa
import config
from third_party import string
from umqtt.simple import MQTTClient
from ubinascii import b2a_base64
import ujson
import utime
def on_message(topic,message):
print((topic,message))
def b42_urlsafe_encode(payload):
return string.translate(b2a_base64(payload)[:-1].decode('utf-8'),{ ord('+'):'-',ord('/'):'_' })
def create_jwt(project_id,private_key,algorithm,token_ttl):
print("Creating JWT...")
private_key = rsa.PrivateKey(*private_key)
# Epoch_offset is needed because micropython epoch is 2000-1-1 and unix is 1970-1-1. Adding 946684800 (30 years)
epoch_offset = 946684800
claims = {
# The time that the token was issued at
'iat': utime.time() + epoch_offset,# The time the token expires.
'exp': utime.time() + epoch_offset + token_ttl,# The audience field should always be set to the GCP project id.
'aud': project_id
}
#This only supports RS256 at this time.
header = { "alg": algorithm,"typ": "JWT" }
content = b42_urlsafe_encode(ujson.dumps(header).encode('utf-8'))
content = content + '.' + b42_urlsafe_encode(ujson.dumps(claims).encode('utf-8'))
signature = b42_urlsafe_encode(rsa.sign(content,'SHA-256'))
return content+ '.' + signature #signed JWT
def get_mqtt_client(project_id,cloud_region,registry_id,device_id,jwt):
"""Create our MQTT client. The client_id is a unique string that identifies
this device. For Google Cloud IoT Core,it must be in the format below."""
client_id = 'projects/{}/locations/{}/registries/{}/devices/{}'.format(project_id,device_id)
print('Sending message with password {}'.format(jwt))
client = MQTTClient(client_id.encode('utf-8'),server=config.google_cloud_config['mqtt_bridge_hostname'],port=config.google_cloud_config['mqtt_bridge_port'],user=b'ignored',password=jwt.encode('utf-8'),ssl=True)
client.set_callback(on_message)
client.connect()
client.subscribe('/devices/{}/config'.format(device_id),1)
client.subscribe('/devices/{}/commands/#'.format(device_id),1)
return client
jwt = create_jwt(config.google_cloud_config['project_id'],config.jwt_config['private_key'],config.jwt_config['algorithm'],config.jwt_config['token_ttl'])
client = get_mqtt_client(config.google_cloud_config['project_id'],config.google_cloud_config['cloud_region'],config.google_cloud_config['registry_id'],config.google_cloud_config['device_id'],jwt)
我已经通过其他示例检查了我对 Google Cloud 的凭据,并且我能够使用我的计算机发布/接收消息,所以从那一边应该没问题。
有人遇到过类似的问题吗?请问有人可以帮忙吗?
谢谢
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