Thank you ! you are so kind !!!
I can understand that !
about Bluetooth, I can get a RS232 to Bluetooth module (10m) about 50 Euros
if buy up 10 once is 30Euros
100m : 60Euros
100m : 35Euros(up to 10)
you can see here : http://www.jinoux.com:8080/web/product/index.jsp?id=2
if it is helpful , I can help you to contact.