AEOTEC USB Zwave module not creating /dev/ttyACM0

When i connect one of these:

https://www.amazon.co.uk/Aeotec-Z-Stick-Z-Wave-create-gateway/dp/B00YETCNOE

I normally get this device:

/dev/ttyACM0

which is used for serial comms to zwave home automation via home assistant.

Connecting it to the Pi4 + Buster i see no such device, infact when i connect via lsusb i see no change before / after connecting.

Any ideas?

[pelwell]

Do you get the same lack of results in the USB2 and USB3 ports?

Yes. I tried both usb2 and usb3 and I'm using a genuine pi 4 for power supply.

[pelwell]

Are there any relevant messages in the kernel log? Unplug the device, sudo dmesg -C (to clear out the old messages), plug it in, wait a moment, then dmesg > usb.txt.

Hmm - i tried a fresh install of buster and got this:

[ 398.804524] usb 1-1.1: new full-speed USB device number 4 using xhci_hcd
[ 398.941260] usb 1-1.1: New USB device found, idVendor=0658, idProduct=0200, bcdDevice= 0.00
[ 398.941278] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 399.010369] cdc_acm 1-1.1:1.0: ttyACM0: USB ACM device
[ 399.012948] usbcore: registered new interface driver cdc_acm
[ 399.012958] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters

and i see /dev/ttyACM0

something is odd about my original install, when i try it on that install i get nothing appearing.

Let me reinstall HA over the weekend and i'll report back.

Thanks!

[pelwell]

"HA"?

HA - Home Assistant. It uses zwave via the serial port /dev/ttyACM0

ok so.... i tried my "fresh" install and i can't recreate that message above. Seems very temperamental. I wonder if its power related.

[pelwell]

Hmm - it could be power related, but I would expect some kind of response to a device insertion, not nothing.

Hmm - I tried the MicroSD card which wouldnt work on the Pi4 on my Pi3B+ and works flawlessly, plugged in + out + in + out....

81.081896] usb 1-1.3: new full-speed USB device number 6 using dwc_otg
[ 81.215187] usb 1-1.3: New USB device found, idVendor=0658, idProduct=0200, bcdDevice= 0.00
[ 81.215205] usb 1-1.3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 81.289184] cdc_acm 1-1.3:1.0: ttyACM0: USB ACM device
[ 81.290193] usbcore: registered new interface driver cdc_acm
[ 81.290201] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
[ 95.383586] usb 1-1.3: USB disconnect, device number 6
[ 102.641555] usb 1-1.3: new full-speed USB device number 7 using dwc_otg
[ 102.774812] usb 1-1.3: New USB device found, idVendor=0658, idProduct=0200, bcdDevice= 0.00
[ 102.774830] usb 1-1.3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 102.775964] cdc_acm 1-1.3:1.0: ttyACM0: USB ACM device
[ 110.231628] usb 1-1.3: USB disconnect, device number 7
[ 115.331396] usb 1-1.3: new full-speed USB device number 8 using dwc_otg
[ 115.464944] usb 1-1.3: New USB device found, idVendor=0658, idProduct=0200, bcdDevice= 0.00
[ 115.464962] usb 1-1.3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 115.466096] cdc_acm 1-1.3:1.0: ttyACM0: USB ACM device

I thought I would check with aeotec as to the certification of the pi4 am I mentioned to check if a module is loaded, they said:

---

​We have tested using RPi V3 in this case, but we have not yet tested RPi 4. One item to absolutely make sure is that the cdc acm module is installed from the Linux kernel which is required to actuate as a ttyACM0 device. I'll look into acquiring a RPi V4 to see if i can find any issues here.

Cheers,
Chris Cheng
Field Application Engineer
Aeotec Inc.
www.Aeotec.com

I'm going to test more over the weekend, any ideas about the module they mentioned?

[pelwell]

The module is in Raspbian images - see your kernel logs above.

Can you try connecting via a powered hub?

I currently only have the official raspberry pi 4 power supply, can you recommend a powered hub? I'll buy one. Thanks!

[pelwell]

I wasn't expecting you to buy one, especially since I don't know if power is the cause of the problem, but the general rule of thumb round here is that Amazon Basics cables and adapters are safe bets.

[bieniu]

I had exactly same issue on RPi 3B after upgrade kernel to version raspberrypi-kernel_1.20181112-1 (November 4). Downgrade kernel fixed the issue. I haven't updated the kernel since then.

I had exactly same issue on RPi 3B after upgrade kernel to version raspberrypi-kernel_1.20181112-1 (November 4). Downgrade kernel fixed the issue. I haven't updated the kernel since then.

interesting but but i am guessing i can't do that with the PI4?