-install react-native-debugger vai hoomebrew:
brew update && brew cask install react-native-debugger

-install redux-devtools-extension
npm install --save redux-devtools-extension

-in package.json => object "scripts", by replacing PORT with your react native runnning port. by default it's 8081
"scripts":{
....
"debug" : "open 'rndebugger://set-debugger-loc?host=localhost&port=PORT'"
}

-in the JS class where "STORE" is set up, in my example : App.js
#import section
import { createStore, applyMiddleware} from 'redux';
import { composeWithDevTools } from 'redux-devtools-extension';

#in createStore function
const store = createStore(reducers, composeWithDevTools(applyMiddleware()));

#### in Action
-start react native app:
react-native run-ios
Or
react-native run-android

-Enable Debug Remote debuggin
In running application, in My example - simulator
with ⌘D in IOS, Or ⌘M in Android
Click "Debug Js Remotely"

-Rux "debug"
in terminal, natigate to the project root.
run:
npm run debug

The React native debugger should appear and connected to port 8081, and Redux State should also be connected.
DONE