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For example, you could use the Network Scan Request to obtain a response that would include RSSI information about any available network that is formed within range of the dongle you're using. Depending on what you want to doNote that the dongle must be in the "Network Down" state. If this is not convenient (for example, if you'd like to query RSSI from a RapidConnect-based coordinator that is currently participating in a network), the Latency Request frame could also can be usefulused.
If you want RSSI information for networks, you can also use the Site Survey Tool.