Does such a thing exist ?
Looking at the same question.
First one I found was this: GitHub - mhaid/zigbee_fishfeeder: ZigBee automatic feeder for fish
It allows modifying an existing feeder (for example: JUWEL Product nr. 89000) to use zigbee.
Also saw this: Best WiFi Fish Feeder Pellet Dispenser | Henrac Tech | Australia Itβs Tuya-based, hopefully the older firmware as the new one sucks for local control.
There are various ones on Alibaba, some that claim Wifi control. I guess some of those may have a local API, but not sure which:
https://www.aliexpress.com/w/wholesale-fish-feeder-automatic-zigbee.html
Some discussion of replacing a Tuya board with ESPhome here:
https://www.reddit.com/r/homeassistant/comments/1c6gfmy/adding_fish_feeder_to_ha/
Which also led me to this:
That last one actually looks really cool, thinking I may go that direction myself.