Before connecting a Huawei smart speaker to an Addo humidifier, check whether the Addo humidifier supports audio input. If yes, you can connect the speaker to the humidifier using an audio cable. Then use the voice control function of the speaker or an APP to remotely control the humidifier.
If the Yadu humidifier does not support audio input, you can consider using a smart socket to connect the humidifier to the smart home system, and then use a speaker or APP to control the socket to switch on and adjust the humidifier. Either way, you need to ensure that the connection between devices is stable and follows security specifications.