Arduino for STM32

Is there a way to use 4 STM32F103C8T6 UARTs (TTL)?

CORE1 : https://github.com/stm32duino/Arduino_Core_STM32

Is there any way to use 4 'UART' functions?
Either hardware or software.

STM32F103C8T6 has only 3 USART instance so only 3 three HardwareSerial can be used:
https://github.com/stm32duino/Arduino_C ... #L137-L152
You can try as a complement the SoftwareSerial library but honestly don't like use it.

@fpiSTM

Thank you for your reply.