yes the file in Sd card,
the file will be very very long,and i don't want to spend a lot of time to read byte after byte
i'm writing every 10 s the temperature on the file
this file will be passed to an java sript evry time that there is some web request,when i recieve the request i need write in the end of the file ' ]' to close the function,
but once the web request finish ,i need to cancel the ']',and write th temperture