PropertyChange events exported from IoT Central always go in the same partition in Azure Event Hub for the same device

Question

I've configured an export of propertyChange events from IoT Central to Azure Event Hub. The event hub has 2 partitions. According to the documentation I saw I expect to see a round-robin strategy on the Event Hub side. But when I check the Event Hub with Service Bus Explorer I see that all property change events from one of my devices (device1) always go in the first partition while all such events from device2 go to the second partition. I see that no PartitionKey is set in the message.
So, the questions are:

1. Why round-robin strategy doesn't work?
2. Is it guaranteed that propertyChange events from a device will always go in the same partition?

Answer 1

My understanding from the other thread is that:

• It's not possible to explicitly set the partition key from IoT Central.
• How messages from IoT Central are assigned to Event Hubs partitions is opaque. You may see all messages from a specific device end up on one partition, but you can't rely on this (as seen by one of the contributors to the other thread).
• If it's important to you that messages are assigned a partition key, you can use one of the strategies outlined in the other thread.