I’m using a lot the MyApp.Endpoint.broadcas/3 method for a phoenix project and I would like to know if there is a way to know if the client receives the message?
That function broadcasts to a process, and it is done async, which tends to be most useful since there can be a lot of processes listening. If you want to know if they receive it then just have them send a message back, same as with any other process on the EVM. 
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