ERROR 515 Bluetooth not conected

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Why appears that error i want to have an automatic mode and clicking 'Cambio_Manual' i want to change to my other screen

The list is to see temperature and humdity

2

BlueTooth connections are lost when you switch screens.

Instead, stack multiple Arrangements, only one visible at a time.

3

Here examples:
https://community.appinventor.mit.edu/t/bluetooth-hc-06-arduino-send-receive-send-text-file-multitouch-image/9518/12

https://community.appinventor.mit.edu/t/ble-esp32-bluetooth-send-receive-arduino-ide-multitouch/1980