Monkeying around with AVS / Echo. Part of the current queue, the JSON seen by the Echo from AVS. Chet Baker in New York.
{"clientId":"Dee-Domain-Music","contentId":"e28e0638-26b8-4737-a2af-69b282e27edc","contentType":"TRACKS","currentState":"PLAYING","imageURL":"
http://ecx.images-amazon.com/images/I/51KaIdx7QmL._SS256_.jpg","isDisliked":false,"isLiked":false,"looping":false,"mediaOwnerCustomerId":"xxxxx","muted":false,"programId":null,"progressSeconds":1,"providerId":"CLOUD_PLAYER","queue":[{"album":"Chet Baker In New York","albumAsin":"B000UBL6X4","artist":"Chet Baker","asin":"B000UBQPVW","cardImageURL":null,"contentId":"41f1a9ce-1075-451f-a0d5-4232a701144c","contentType":"TRACKS","durationSeconds":414,"feedbackDisabled":false,"historicalId":null,"imageURL":"
https://album-art-storage-us.s3.ama...181593&Signature=k/9l5SFzxxxMmZX89YsXPbZjdSM=","index":1,"isAd":false,"isDisliked":false,"isFreeWithPrime":false,"isLiked":false,"programId":null,"programName":null,"providerId":"CLOUD_PLAYER","queueId":null,"radioStationCallSign":null,"radioStationId":null,"radioStationLocation":null,"radioStationName":null,"radioStationSlogan":null,"referenceId":"611e12dc-ba52-49d9-b4b7-6f14bba9c957:1","service":"CLOUD_PLAYER","startTime":null,"title":"Fair Weather","trackId":"41f1a9ce-1075-451f-a0d5-4232a701144c","trackStatus":"AVAILABLE"},...
From an Echo enthusiasts site:
Good news, we can easily retrieve what Amazon Echo is playing by:
https://pitangui.amazon.com/api/media/state?deviceSerialNumber=XXXXX&deviceType=XXXXX
We can find the serial number and device type here:
https://pitangui.amazon.com/api/device-preferences
The whole queue is shown, as well as the current play state and the volume.