This APP is for IPPower 98series product only, IPPower 98s support MQTT protocol. If your IPPower 98s connected an MQTT server, you can use the APP to control it.
IPPower 98s firmware version must be Ver 1.18_652 or above
There are several free MQTT servers on the internet.
Ex. tcp://mqtt.eclipse.org:1883
or you can download and build it by your self.