Thank you Tim for your reply,
Talking about bugs in the WiFi shield, I have noticed two things: sometimes, the Arduino outputs: "WiFi Shield not present", and I have to reset the unit again. After that, the WiFi transfer is not very reliable, it crashes inexplicably after 10 or 20 minutes, which is not good especially if you want to develop something more serious and sell it.
I think the Arduno is very good when developing some lab/teaching systems, but for industrial/professional use I will need something else more reliable. Do you have any suggestions?
Best regards,
Jean