It was noticed that the recent official add-on for the Midea AC also partially recognized Midea Dehumidifiers. Long story short, a working draft jar was created for dehumidifier support and can be found here. Release Midea AC binding in OH5.1 + Dehumidifier · apella12/openhab-addons. (Use the official mideaac binding available from the OH5.1 store for ACs).
As is the case for Midea ACs, Midea is an OEM for many brands. The best way to tell if your device may be supported for LAN control with the OH Midea binding is if you can control the device via an internet app, like NetHome Plus, MSmartHome, or Midea Air. For instance, my Midea AC is a Cooper&Hunter brand.
It would be helpful to test other dehumidifiers before submitting a PR. Each brand with Midea OEM tends to implement a bit of customization that needs to get captured. One note; with the one dehumidifier tested, Scan did not work. Don’t know if this was a local issue or common to all dehumidifiers. The alternative is to use the manual dehumidifier option with the device IP.