Clarification on which Gateways receive SendDataToWirelessDevice downlink messages

Question

Our AWS account supports multiple private LoRaWAN networks (multi tenant- for different customers).

When sending a downlink to a Class A Device using [SendDataToWirelessDevice](https://docs.aws.amazon.com/iot-wireless/2020-11-22/apireference/API_SendDataToWirelessDevice.html) Device ID is provided.  Which Gateway(s) is this message dispatched to?  Is it sent only to the Device's "Last connected gateway", or?

I want to ensure downlinks destined for CustomerA do not broadcast to CustomerB's Gateways.

Accepted Answer

AWS IoT Core for LoRaWAN tracks which gateway a device is adjacent to, based on last known uplink RSSI. Downlink messages are sent to only that adjacent gateway.

Clarification on which Gateways receive SendDataToWirelessDevice downlink messages

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