I saw somebody suggest “a block which can broadcast messages between projects”, and of course remembered the old Scratch 1.4 feature called Mesh. I thought, could this be done in Scratch 3.0? And it turns out: yes, definitely yes!

I'll spare the technical details (but you can look here if you're curious). Basically, I made an extension with these two blocks:

when I receive [hello] from another tab :: #0FBD8C hat

broadcast [hello] to other tabs :: #0FBD8C

I definitely have plans to add more blocks – specifically to broadcast data alongside a message.

Ideas for more blocks and general input are welcome!

I added two new blocks:

broadcast [message] with data [data] :: #0FBD8C
(received data :: #0FBD8C)

They're pretty self-explanatory. Here's a demo! In one project:



..then in another project:

Nice! Is it in a project? Or Scratch X?

nightuser wrote:

Nice! Is it in a project? Or Scratch X?

Thanks! It's sort of like ScratchX, but it's a Scratch 3.0 extension, meaning it's written with code that only works with 3.0, not ScratchX. You have to run and modify Scratch's source code locally (downloaded to your own computer) to run it; it's a bit of a hassle, unfortunately.

Oh! Thanks– Is the code on Stack Overflow?

Also- Thanks for being so kind about it!

nightuser wrote:

Oh! Thanks– Is the code on Stack Overflow?

Also- Thanks for being so kind about it!

Nah, it's exclusively in a local repository on my computer.

Of course!

Oh!

Thanks! U Lit!

add [_nix is cool] to [notes]

is there a version that can send brodcast between devices, istead of just tabs?

Also is there any where to download this extension?

pobloecat wrote:

is there a version that can send brodcast between devices, istead of just tabs?

Also is there any where to download this extension?

That would be really cool.

pobloecat wrote:

is there a version that can send brodcast between devices, istead of just tabs?

Also is there any where to download this extension?

This could be made with webRTC.

You should put it on GitHub so other people can use it