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It's here! Check out "deviceid" here: https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/alexa-skills-kit-interface-reference#request-body-syntax
If you want to find the mac address of your own device you can find it in the Settings, Devices area of your Amazon Alexa mobile app. If you know the mac address of your device you can use network tools such as arp-scan to find the ip address of the device. This will only work if you are on the same network as the device. This is useful if you are deploying devices to different rooms in a home or office.
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