Two ways to do that.
First, use this module to do that, https://github.com/ktonon/react-native-port-patcher
Second, change all the 8081 to 8088 from your app module which located in go to <your app> ode_modules eact-native
Two ways to do that.
First, use this module to do that, https://github.com/ktonon/react-native-port-patcher
Second, change all the 8081 to 8088 from your app module which located in go to <your app> ode_modules eact-native