Sending data specific location in MIT apps using arduino and Bluetooth

MIT App Inventor Help
,
1

Hi
I revised my MIT apps from one screen to two screens, and it worked as expected, but now my concern is how I can send data to a specific location in MIT apps.

Here's the expected location :
image

i upload my arduino complete code here :
https://codeshare.io/lonMJj

i'm not sure if this is possible.

Smart_Locker_v1.2.aia (1.3 MB)