Asking for help to send a byte using Bluetooth every 20 millis

MIT App Inventor Help
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23

Here are two blocks you can drag into your Blocks Workspace to address errors ...
when BlueToothClient1 BluetoothError

when Screen1 ErrorOccurred
when Screen1 ErrorOccurred854×170 15.8 KB

I left them empty (blithe) to ignore errors.

A more scrupulous approach would be to have them log errors.
Sample logging procedures:

https://groups.google.com/d/msg/mitappinventortest/II_RlElGddU/J0q_E-2rAwAJ