Arduino for STM32

i use stm32f102c8t6 with arduino ide.
i use Adafruit Ultimate GPS, LPS25HB pressure sensor and Xbee Pro S2C.
I need softwareserial library because i dont know how can i usart without this library.
maybe you can help me.

Greetings to all developers, I'm new to the world of stm32duino.

I need to send data with Usart, but I cannot use the Software Serial library with stm32f103.
Is there a similar library or what would you recommend me to do?
I am using stm32f103 I program with stlink.