def handle_client(client) do
        msg = IO.gets("> ") |> String.trim
        :gen_tcp.send(client, buffering(msg))
        :gen_tcp.send(client, msg)
end

When I replace the function that takes input(I tried IO.gets/1 and IO.read/2) with a normal string, the message is sent normally.

Here is the function that listens and accepts connections(irrelevant, I think ?)

def listen_and_accept(ip_addr) do
        case :gen_tcp.listen(8000, [:binary, active: false, reuseaddr: true, ip: ip_addr]) do
            {:ok, server} ->
                IO.puts "Listening..."
                case :gen_tcp.accept(server) do
                    {:ok, client} ->
                        IO.puts "Client accepted"
                        spawn fn -> handle_client(client) end
                    {:error, reason} ->
                        IO.puts "Error in :gen_server.accept: #{reason}"
                end
            {:error, reason} -> IO.puts "Error in :gen_tcp.listen: #{reason}"
        end
end

Thanks in advance guys.