[Bug] Ignore stdin when no program is running

[laurensvalk]

At the moment, programs downloads and user input/output happen on the same Bluetooth characteristic.

So when no program is running and you type something (anything) in the terminal, the hub interprets it as a program, which usually gives:

ValueError: incompatible .mpy file

As a workaround, perhaps Pybricks Code could ignore user input when no program is running.

Example: stopped a program and then press UP or DOWN button, shows:

SystemExit: stop button pressed
ValueError: incompatible .mpy file
ValueError: incompatible .mpy file
ValueError: incompatible .mpy file
ValueError: incompatible .mpy file
ValueError: incompatible .mpy file

No idea why I would want to press UP or DOWN though 😃
And do not know what the cursor keys are supposed to do.
Most browsing keys act the same.

Originally posted by @BertLindeman in #297 (comment)

[laurensvalk]

We could also accept this as-is, knowing that we will revisit it in the next version.

As long as program downloads still work after getting this error, this may be acceptable.

[laurensvalk]

This should be fixed by pybricks/pybricks-micropython#109 when it gets merged.

[laurensvalk]

This should be fixed by pybricks/pybricks-micropython#109 when it gets merged.

This is done, so we can close this.