C19 thermal Printer Custom Firmware Development

I need custom firmware for the C19 thermal printer to enhance its app compatibility. It should work with any Bluetooth-enabled app, enabling printing of labels, barcodes, and QR codes.

Requirements:
- Custom firmware development for C19 printer
- Ensure detection by all Bluetooth apps
- Support printing: labels, barcodes, QR codes
- Security features not necessary

Ideal Skills and Experience:
- Experience in firmware development
- Knowledge of Bluetooth connectivity
- Familiarity with C19 printer architecture
- Strong coding skills in relevant languages