-module(test_erlport).
-export([hello/1]).
-define(LOG(Name, Value), io:format("DEBUG: ~s: ~p~n", [Name, Value])).

hello(Name) ->
  % Spawn test_erlport.py script and open communication channels
  Port = open_port({spawn, "python -u test_erlport.py"},
      [{packet, 1}, binary, use_stdio]),  
  ReqData = term_to_binary({hello, Name}),
  % Send binary data to hello.py script
  % ?LOG("ReqData", Port),
  port_command(Port, ReqData),  
  % Wait for reply from hello.py script
  receive
      {Port, {data, RespData}} ->
          % Convert binary data to term
          {ok, binary_to_term(RespData)}
  after
      5000 ->
          {error, timeout}
  end.