mml_server.rb

require 'sinatra'

set :port, 8000

post '/mml' do
    File.open('mml.txt', "w") do |f|
        f.write("#mml\n");
        f.write(params[:mml]);
    end
    params[:mml]
end

get '/mml' do
    if File.exist?('mml.txt') then
        content = File.read('mml.txt')
        File.delete('mml.txt')
        content
    else
        ""
    end
end

play_mml.py

import time
import serial
import sys
import httplib, urllib

tmp_msg = "/dev/ttyACM0"
ser = serial.Serial(tmp_msg)
ser.baudrate = 115200
ser.timeout = 1
print ser.portstr

_SEVER_ = "youchan.org:8000"
_ADDR_ = "/mml"

friquency = {
        "f": 369.99,
        "g": 391.99,
        "a": 440,
        "b": 493.88,
        "C": 554.36,
        "D": 587.32,
        "E": 659.25,
        "F": 739.98,
        "G": 783.99,
        "A": 880,
        "B": 987.76,
}

cnt = 0
while 1 :
        headers = {"Content-type": "application/x-www-form-urlencoded","Accept": "text/plain"}
        conn = httplib.HTTPConnection( _SEVER_ )
        conn.request("GET",  _ADDR_ , "", headers)
        response = conn.getresponse()
        data = response.read().split('\n')
        conn.close()

        if data[0] == "#mml" :
                time.sleep(3)

                mml = data[1]
                print(mml)
                for i in range(0, len(mml)/2):
                        if mml[i*2] == "r":
                                time.sleep(.3 * int(mml[i*2+1]))
                                continue

                        ser.write("13,%d,%d\n" % (friquency[mml[i*2]], 240*int(mml[i*2+1])))
                        time.sleep(.3 * int(mml[i*2+1]))
        time.sleep(1)
        data = []

ser.close()