Hi guys, I'm facing a problem with my Compose multiplatform project. When I try to read barcodes wit...

# multiplatform

[Esteban Vasquez]

Hi guys, I'm facing a problem with my Compose multiplatform project. When I try to read barcodes with my Zebra ET45 internal scanner, the focus loses completely, and I can't write anything else. Can anyone help me with this?

[François]

I don’t think it’s a kotlin issue

[darkmoon_uk]

Usually barcode readers can operate in either HID mode (for compatibility with all Apps) or via dedicated channel (best user experience).

In HID mode they're emulating a keyboard, which is probably interacting badly with Compose in this case. Likely the configuration is emitting tabs, newlines or other control codes along with the barcode digits themselves, and that's causing a focus change. See if you can initialise the reader in a different mode.

On handheld wireless scanners this usually means connecting Bluetooth in RFCOMM Bluetooth profile (emulating a Serial port), but for an internal Zebra scanner I'd expect some SDK function.

Overall I agree with @François this is almost certainly a Zebra Scanner issue and not a Kotlin one.

See: Zebra Scanner SDK for Android

[Esteban Vasquez]

Thanks guys I resolved the problem already

[darkmoon_uk]

@Esteban Vasquez Anything worth sharing? I may be deploying CMP on Zebra Devices soon too.

[Esteban Vasquez]

Nothing special, I just created a new project and I compared both since the second one worked without any issues, so the solution just was upgrading my gradle plugin to the actual version. I'm not an expert so I don't know why it works now!