Use the API on your Google Home to view things like alarms, music playing, volume,...

I'm not sure if this is common knowledge but I've never came across anything while searching Google.

Basically, you can call the API on your Google Home to get info about things like alarms in JSON format. For example, I'll use this to display current alarms and timers on a screen in the same room as the Google Home.

How to do it: First you'll need to find the IP address of your Google Home. You can use something like Fling (Android app) for this or just log in to your router. Then make a simple GET call like this: http://192.168.X.XX:8008/setup/assistant/alarms. Change 192.168.X.XX to your IP.

This will give a response like this:

{"alarm":[{"date_pattern":{"day":15,"month":1,"year":2018},"fire_time":1515995400000.0,"id":"alarm/5a77ecee-0000-24fd-9251-001a114cb4cc","status":1,"time_pattern":{"hour":6,"minute":50,"second":0}}],"timer":[]}

I'm not sure what other calls you can make but I'm pretty sure you should be able to call everything that the Google Home App is able to display (i.e. current music). You can use an app like Packet Capture and hook it into the Google Home app to find out about other API calls it makes.

Hope this was useful to someone!

Edit: While looking a bit more into the API, I found the following values:

{"ble_supported":true,"bluetooth_audio_sink_supported":true,"bluetooth_audio_source_supported":false,"bluetooth_supported":true}

Could this mean using the Google Home as bluetooth source instead of bluetooth sink is or will be possible?