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Yes, I've noticed that and added for the future version this hw revision too.

We will soon get more RPi4 to make more tests. Hope we get this new revision and not the same as we tested before.

Wow, the meaning of hw revisions is to be checked according to a bitmask: https://www.raspberrypi.org/documentati ... /README.md

We will implement this approach

Hi dears,
I’m on the wave too.
Here, there is a Raspberry Pi4 with Razberry2 (green board) and of course buster OS.
I’ve read your post and tried all that you suggested but with no positive results.

grep Revision /proc/cpuinfo
Revision : c03111

The zway server is correctly up but there is no communication with the chip.
Available to test alternative suggestions

These are the final settings that work for me.
Z-Wave Network Access - Serial port to Z-Wave dongle = /dev/ttyAMA0

sudo nano /boot/config.txt
The only Bluetooth or Uart setting is:-
dtoverlay=pi3-miniuart-bt

Hi,
after other checks, my system still does not work.
I can imagine the problem is between buster and raspberry pi4 but focused on pi4.
Between others, I've made an attempt using buster on a Pi3 modelA+ and everything works perfectly.
I tried to manage overlays in several different ways but with no positive results.
I trust micky1500 because it seems to be obvious what he is doing but strangely on my system doesn't work.
I can disable bt, activate bt on minuart, have both ttyAMA0 and ttyS0 and other but for some strange reason, raspberry can't communicate with razberry.
I'll try to deep investigate more.

This guy has some very good info on why it is so difficult to get the razberry to work on a Pi3 and Pi4: https://www.circuits.dk/setup-raspberry-pi-3-gpio-uart/

It is important to note that according to the author, everything below here is only needed if you both have a razberry z-wave board installed in a raspberry pi 3. Have a Pi2 or Pi1? Stop reading. Have a different z-wave usb stick or other z-wave adapter? Stop reading, this is not for you. Even though I haven't been able to verify this myself, I think the Pi4 also has bluetooth by default enabled, just like the Pi3, so I think it also does need below steps if you have a razberry z-wave adapter installed. Anyway, here are the instructions to get razberry working in a Pi3 and most likely also a Pi4.

I had to do a fresh reinstall to get Buster and latest Domoticz 2020.1. After installing Buster I installed Domoticz, all according instructions. And no problems occurred until I restored my backed up domoticz.db. That very same pi3 with the same razberry that worked well for over 2 years, didn't work at all any more: Domoticz became unstable, my z-wave devices list remained empty, and worst of all I couldn't edit my hardware settings, not even to disable the z-wave hardware. After a long search the above page helped me regain control over Domoticz and my razberry. I went for the "Swapping the Serial Ports on Raspberry Pi 3" option in the bottom leaving bt enabled but on the miniuart, whereas the UART is now once again assigned to the GPIO pins and thus available to razberry.

In short, not only do you need to disable or move(re-wire?) bt to free the UART, you also need to re-assign the UART to the GPIO pins and you need to disable the serial console. The details are in the page linked to above, here are the steps I have executed to get my razberry working in my Pi 3.

Log in via SSH.
Type and press <Enter>.
Check for a line saying , if it doesn't exist, add it to the bottom of the file.
Also check for a line saying or . If neither exists, add one of the both to the end of the file. pi3-miniuart-bt leaves bluetooth enabled but connected to the less capable miniuart, pi3-disable-bt disables bluetooth altogether.
Now press <ctrl->-O (that an o, not a zero),
press <Enter> to accept the original name.
Press <ctrl>-X to exit nano.

Now we I disabled the Serial Console by executing the following commands:
This file has 1 long line in it and it is important that this remains exactly 1 line. Don't change anything in it other than described below. Read this carefully: don't even add a space or a linefeed anywhere in this file. The line consists of multiple pieces formatted as <keyword>=<value(s)>, spearated by a single space. Look for any pieces that start with "console=". Only one such piece should remain: console=tty1, any other piece that starts with "console=" you delete from the line, including any value(s) behind it, up to the next space.

So if the file contains for example: You remove the piece , as that starts with "console=" and you need to remove everything up until the next space. So in this exampe the line would look now like this: Once this is done, press <ctrl-O>
press <Enter>
Press <ctrl>-X

And finally reboot by typing Fpr me it was set to this port already, but in case you've just installed, the serial port to set on the OpenZWave USB hardware in Domoticz is "/dev/ttyAMA0".

And after this my z-wave list got filled automatically with all my devices. I still had to re-include almost all battery powered devices to get the Manufacturer, ID and Type to get read from the devices, but as long as you don't exclude the devices, if you include a device, it will be assigned the same Id it had before, So apart from that it takes a lot of time, this is not a problem.

Thanks for detailed description, I once had problems with a test system, this may help in future.

@rrozema Do you know that Z-Way install script does all you need for you? So you can just install Z-Way and then disable it. It will configure the port for you.

Additionally you can keep Z-Way on your system to run it in future to upgrade the RaZberry firmware.