Couldn't connect to PH04 humidifier/purifier from three different devices. Two Samsung phones and an iPad. Wifi and Bluetooth on with all devices. Followed instructions to ensure wifi turned on with the PH04. Tried turning off the PH04 for 10 minutes. Tried restarting the phones/iPad. Never connected. Error "We're having trouble detecting your machine". Gave up after an hour of trying. Machine works fine. App is terrible.