An overview of Join

This is like a messaging app, by the same developer of Tasker. If you want to know more about Tasker click here. PushBullet comes close to what Join does.

Here are some of the things you can do between two join devices:

1. Paste clipboard from one device to another
2. Send text notes from one to the other
3. You can send a URL from one device to the other. If the latter device happens to be a phone/browser, it will open a new tab with the URL
4. Send voice messages. You can write text on one device. It will be played over at the other end.
5. Send files...

It is possible to run custom actions. Join actions are different from Tasker. They are limited to messaging. A good example is doing a broadcast message to all devices.

However, Join also registers as a Tasker plugin. Which means you can do all of the above from Tasker.

For e.g. I use a combination of Tasker & Join to control my music playing experience.

You can also make other devices talk to join devices. Almost all common APIs are exposed over HTTP. So for something running in a raspberry pi device, all it needs is to make a http request (cURL) to the http api to get a message across.