'Does IotHub>EventHub>FA store the sequence of the message sent

Here is the scenario:

Device1 sends two iothub D2C Messages at one time:

  1. That sets the flag to true
  2. That sets the flag to false

The Iot Messge Routing routs the message to eventhub which will trigger the EventHubTriggered Function App: In this case, is it guaranteed that the flag value will be false as the 2 was sent after 1?

azureazure-functionsazure-iot-hubazure-eventhub


Solution 1:[1]

Azure IoT Hub guarantees that messages are sent in order for that unique device. It does not guarantee ordering between devices:

example : device a sends [a1,a2,a3] and then device b sends [b1,b2,b3] . IoT Hub will guarantee that a3 is always received after a1 and a2, though it can happen that [b1,b2,b3] are all received before [a1,a2,a3].

The Iot Messge Routing routs the message to eventhub which will trigger the EventHubTriggered Function App: In this case, is it guaranteed that the flag value will be false as the 2 was sent after 1?

Yes! Because this is sent by the same device and IoT Hub only expects one connection per device.

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Source: Stack Overflow

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Solution 1 asergaz

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