The problem is that I couldn't stay connected with the bluetooth module with the others screen, which consists of clicking the buttons to send the commands. Then I use the block "open another screen, start value" to send a variable that contain the MAC Address of the android device. But after watching and reading a lot, I couldn't find an answer about why i cannot stay connected after changing screens in the app. In other words, In the main screen I can send data but when i try to send data from another another then the erro of loose connection appears.
The error that shows up when the connection is lost is "Error 507" of app inventor.
PS: sorry about my English, is pretty lame.
for bluetooth I recommend you to use only one screen
to simulate different screens, just use vertical screen arrangements and set them to visible = false or true as needed
Thanks for your response!
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