I would like to know if the homebridge plugin is bidrectional, ie if, thorugh iHost, I can manage all the devices that are mapped in homebridge (ie, the tuya wifi that I can see in homebridge).

It won’t work the other way around I think. You can actually try out HomeBridge on other devices like your old PC or Raspberry Pi.

What you are looking for should be something like this GitHub - hobbyquaker/homekit2mqtt: HomeKit to MQTT bridge 🏡📱

Or maybe Node Red with virtual appliances between tuya and ihost. Let’s see when I will receive the ihost I ordered

yes you can create Virtual Devices in iHost to control devices in Node-red