Can you explain the logic in “request_location?”  method of device object.

There are two conditions: gateway_device and gateway_device.respond_to?(‘submit_location_request’).
What’s the ‘submit_location_request’ is a hard code value?
In what scenario, the gateway_device will be ‘submit_location_request’ ?

This basically checks that the method “submit_location_request” exists. If it does then the location request will be submitted. I hope that makes sense.