I'm building a wireless photoframe. The one thing I haven't been able to figure out is how to get my wifi connection back up using a recommended method.

Right now I edited /etc/network/interfaces so wlan0 is started at boot:

auto wlan0

iface wlan0 inet dhcp

        wireless-essid ourssid

This method works fine for booting. But I found that if I do not check the connection for a long time (could be a week) it might be down. So I should reconnect.

What I do now to verify the connection is working is downloading a file from the server that can't be cached (http://server.ext/ping.php?randomize=123456)
If I fail to retrieve the file I assume that the connection is no longer working and I run a shell script like

#!/bin/bash

ifconfig wlan0 up

iwconfig wlan0 essid "ourssid"

dhclient wlan0

And the connection comes back. But I can't find anything if this is in any way a good method.

Can this be improved upon, or is this already right?