It looks like you can get them with waybackmachine:
https://web.archive.org/web/20211014141 ... n/DSM_7.0/

https://www.domoticz.com/wiki/Synology

only it looks like http://www.jadahl.com/iperf-arp-scan/DSM_7.0/ is down right now, but maybe you can find the files somewhere else also.

@jumbotroll Thanks for this!
I had myself learning some terminal commands. But I figured it out and it works! thanks!
I did use your files and uploaded them with ftp to the homes/user folder.
Than in terminal I used the mv command to move the files to /lib/modules/

Than I did your final step ...

Thank you for your great guide! I have Domoticz now running for my smart meter p1.
I have added your guide with this part for the USB drivers:
Login to DSM via SSH and do/check the following:

Confirm that the kernel sees the P1 cable after plugging in/out:
$ sudo dmesg

Confirm that there is no ...