react-native Chrome debug from device is broken? ( Runtime not ready for debugging )
You're close, one more step and works for me at the moment after facing exact situation:
"To debug on a real device:
On iOS - open the file RCTWebSocketExecutor.m and change localhost to the IP address of your computer. Shake the device to open the development menu with the option to start debugging. [1]"
[1] https://facebook.github.io/react-native/docs/debugging.html