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It is supposed to be a usb serial device. My opinion is that it's not a fault of the USB chip to refuse to talk to a device that could potentially fry the port logic. I want to use Aeon Labs Z-wave stick in FreeBSD 10.2. In this state, the D- line floats up to 3v3 after every packet so it looks like the upstream port 10k pull-down resistor(s) aren't enabled.

I can get it into a state where the device does actually attach, by forcing D- to 0V temporarily. Aeon Labs / Aeotec Z-Wave Z-stick USB Adapter Dongle If you already have a PC that is always. Plugging a different device into the same port results in an attach event, so it appears the behaviour is temporary. If I plug this device into either the Pi 4 or a USB3.0 hub with VIA chipset, the 20ms pull to 5V appears to trigger some sort of protection within the upstream port - both D+ and D- lines end up at >3.3V (SE1) and a device attach does not occur. This is a gross violation of the USB electrical spec. After 20ms, the pull strength drops which results in D+ dropping to about 4.1V.

To set up new gadgets on the network, you will usually find a button to. Figure 2: The Z-Wave slave, in the form of the Aeon Labs DSC06106 network switch, receives commands for switching the consumer on and off wirelessly. On initial connect, it pulls D+ to +5V through a strong pull-up. Figure 1: The Z-Wave DSA02203 USB stick controller by Aeon Labs lets a Linux system send wireless commands to Z-Wave slaves. This device has some very non-compliant behaviours.