Communications.transmit information

Hi all,

I'm looking for information about Communications.transmit.

On toybox api docs I cannot find any information about what type of content is expected, how convert this message on a push notification, it is possible? what can I do with this content? What format it must be?

My focus is to send a notification to the phone in order to notificate something happens after you save the activity (watch app), but I'm a little bit lost with this...

Any help would be appreciated.

Thanks in advanced,