Enable the Watts Up Pro device. The Watts Up Pro contains a generic FTDI USB device without a specific vendor and product ID. When we probe for WUP devices, we can cause the user to get a perplexing “Device or resource busy” error when attempting to use their non-WUP device. The generic FTDI device is known to also be used on: Sparkfun FT232 breakout board Parallax Propeller

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