We have two access points on the shop floor. One of the AP's is not performing correctly with erratic signal strength and connectivity. Are there any open source tools available to measure performance of a wireless access point or router?
I'm fond of inSIDDer from metageek.
NetStumbler is a good free tool for measuring the performance of wireless connections.
I think kermit will tell you a range of stats about the wireless network itself that you might not normally see. netperf can be used to test the network performance.
Be aware the single strengh is only one measure, you care about the single/noise ratio, dropped packets, whether there are other SSID's transmitting on the same channel.