azure iothub直接方法未按预期工作

Question

我能够在iothub消息（从云到设备的消息）上打开一个侦听器，但我无法订阅direct方法。我尝试使用mqtt支持，而不是iothub库

我已经跟踪https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-direct-methods#mqtt但一定有一个小细节我还没有设法做到正确

这是我的代码（python）

from paho.mqtt import client as mqtt
import ssl
import token_generator #a script that exports the token , it is working fine for device messages

path_to_root_cert = "cert.cer"
device_id = "mydevice_id "
endpoint ="myiot_hub_name.azure-devices.net/devices/mydevice_id "
policyKey = 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
sas_token =  token_generator.generate_sas_token(endpoint ,policyKey ,None)
iot_hub_name = "myiot_hub_name"

def on_connect(client, userdata, flags, rc):
  print ("Device connected with result code: " + str(rc))
def on_disconnect(client, userdata, rc):
  print ("Device disconnected with result code: " + str(rc))
def on_publish(client, userdata, mid):
  print ("Device sent message")
def on_message(client, userdata, msg):
    print("Message received at: " + msg.topic+" with payload: "+str(msg.payload))

client = mqtt.Client(client_id=device_id, protocol=mqtt.MQTTv311)

client.on_connect = on_connect
client.on_disconnect = on_disconnect
client.on_publish = on_publish
client.on_message = on_message

client.username_pw_set(username=iot_hub_name+".azure-devices.net/" + device_id, password=sas_token)

client.tls_set(ca_certs=path_to_root_cert, certfile=None, keyfile=None, cert_reqs=ssl.CERT_REQUIRED, tls_version=ssl.PROTOCOL_TLSv1, ciphers=None)
client.tls_insecure_set(False)

client.connect(iot_hub_name+".azure-devices.net", port=8883 )

client.subscribe("iothub/methods/POST/")

client.loop_forever()

Answer 1

我也面临这样的问题。花了一段时间后，我发现实际问题在python示例中。

根据留档，用户名应该是{iothubhost name}/{device_id}/？api-version=2018-06-30但在示例中缺少版本。因此，如果您尝试订阅从$iothub开始的任何主题，它都不起作用。

在修复用户名后，一切对我来说都很好。

Answer 2

客户端应该订阅以下主题：

$iothub/methods/POST/#

以下是订阅的其他主题：

$iothub/twin/res/#
$iothub/twin/PATCH/properties/desired/#
devices/{myDeviceId}/messages/devicebound/#
devices/{myDeviceId}/modules/{myModuleId}/messages/devicebound/#

和设备流（当前在预览中）

$iothub/streams/POST/#