Question

我正在将本机MQTT与Azure IoT中心一起使用。潜在的问题是，一旦将有效负载路由到Blob存储，它将被编码为Base64。我认为这是由于缺少系统属性“ contentType = UTF-8”。

我尝试使用以下主题没有成功：

devices/test/messages/events/contentEncoding=UTF-8&contentType=application/json
devices/test/messages/events/contentEncoding=UTF-8
devices/test/messages/events/contentEncoding=UTF-8&contentType=applicationjson
devices/test/messages/events/.contentEncoding=UTF-8

这会将这两项放入“属性”巢中，该巢独立于“系统属性”巢（请参阅下文）。

{"EnqueuedTimeUtc":"2019-07-31T19:24:57.4290000Z","Properties":{"contentEncoding":"UTF-8","contentType":"applicationjson"},"SystemProperties":{"connectionDeviceId":"test","connectionAuthMethod":"{\"scope\":\"device\",\"type\":\"sas\",\"issuer\":\"iothub\",\"acceptingIpFilterRule\":null}","connectionDeviceGenerationId":"000","enqueuedTime":"2019-07-31T19:24:57.4290000Z"},"Body":"msginbase64insteadofutf8"}

我尝试根据此处描述的“通用格式”来格式化消息，但也没有成功：https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-routing-query-syntax#message-routing-query-based-on-message-properties

Answer 1

以下是发布者主题和系统属性的示例*：

devices/test/messages/events/$.ct=application%2Fjson&$.ce=utf-8

如何使用本机MQTT设置Azure IoT中心的“系统属性”？

1 个答案: