I'm so fed up with Internet of Shit stuff that these days if I need some random thing like a cradle rocker I'll first check to see if there's a DIY Arduino-based solution out there. In this case, sure enough, there is:
I made a DIY rocker for my son in 2 minutes at home when he was born... I took a breast milk pump that has an oscillatory vacuum, hooked it to a large syringe used for marine epoxy, and taped the syringe to one end of a removable car seat that had a curved rocking bottom.
A simple rocker or swing isn't as effective as a snoo, however.
https://www.instructables.com/Arduino-Cradle-Rocker/
https://www.instructables.com/INTELLIGENT-BABY-ROCKER/