Subscribe to Phoenix.PubSub from another application

Questions & Help Questions
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5

I figured it out without the Phoenix.PubSub. I think it’s all I need.

Create pg2 group in A

defmodule A.Application do
  def start(_type, _args) do
    :pg2.create :some_group
    # ...
  end

Connect to group in B

defmodule B.Application do
  def start(_type, _args) do
    children = [
      # ...
      {B.Worker, []},
    ]
    # ...
  end

defmodule B.Worker do
  use GenServer

  def start_link(opts) do
    {:ok, pid} = GenServer.start_link(__MODULE__, :ok, opts)

    true = Node.connect(:"a@MacBook-Pro")
    :ok = :pg2.join(:some_group, pid)

    {:ok, pid}
  end
end

Send message in A

iex(a@MacBook-Pro)1> [pid] = :pg2.get_members :some_group
iex(a@MacBook-Pro)2> send(pid, :hello)

Handle messages from A in B

defmodule B.Worker do
  def handle_info(msg, state) do
    IO.inspect msg

    {:noreply, state}
  end
end