How to transfer a chunk data from a device to the other one?

Questions / Help
1

I am learning and I did examples of Node interface to communicate messages between multi-devices.

There are a Nerves target and the other device of Phoenix for watching image through ethernet.
What means can I use to transfer an image data in the Nerves to the Phoenix watching the data?

Thanks!

2

I am sorry that I found a way. I thought that sending data should be “text/character” data but binary data.

defmodule Server do
  def server_start do
    pid = spawn(__MODULE__, :loop, [])
    :global.register_name(:server, pid)
  end
     
  def loop() do
    receive do
      {sender, msg} ->
        data = File.read!(msg)
        send sender, {:ok, data}
    end
    loop()
  end
end
 
defmodule Client do
  def start do
    send :global.whereis_name(:server), {self(), "racoondog.jpg"}
     
    receive do
      {:ok, message} ->
        File.write("getimg.jpg", message)
    end
  end
end

Then

---- server
iex(server@HOST)>Node.connect(:"client@HOST")
true
iex(server@HOST)>Server.server.start
---- client
iex(client@HOST)>Client.start

iex(client@HOST)>ls
xxx      getimg.jpg  xxx
$ open getimg.jpg   ---> it shows up correctly.