Home Message Center

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This skill is designed to be used with a home automation to play messages when a door is opened, a motion detected, etc.
In this case, Message Center can be invoked from an Alexa routine, which is equal to saying "Alexa, open home message center".
Here is a typical dialog with the skill:

> Alexa, open home message center
< No messages

> Alexa, ask home message center to record message, I'll will be home by 8 o'clock
< Message: I'll will be home by 8:00. Are you happy with it?
> Yes
< Message saved.

> Alexa, open home message center
< There is a message: I'll will be home by 8:00. Do you want to delete it?
> Replay message
< There is a message: I'll will be home by 8:00. Do you want to delete it?
> Yes