Attachments: Up to 2 attachments (including images) can be used with a maximum of 512.0 KiB each and 1.0 MiB total.
Yo can configure your device on aws iot and then write control logic in smart home skill adaptor lambda code.
Yup. Valve isn't supported per se, but we do support 'on' and 'off' commands which you could apply to the valve.
No one has followed this question yet.
Reset device list in the Alexa app on iOS / Android
Does the Home Skills API support ad-hoc queries / commands?
Device Name Length
ISSUES of 'proactivelyReported' does not work && 'there was a problem'
Does "implicit targeting" only work with the latest Smart Home Skill API?