Write an Android application for Huawei watch

Create an app that is installed on Huawei Watch, 1-this watch/app is connected to a local wifi network. 2-A mobile is connected to the same local wifi network 3-when I click on a button on the watch, it sends a notification to this mobile, 4-on the mobile when I click on the notification, it sends back a notification to the watch and a countdown (sound) starts on the watch