STM32 Modbus serial communication

I am reading sensor data from i2c with stm32f103c8t6 card. I want to transfer data via modbus. I couldn't find a suitable modbus library for stm32. This is the work I want to do, but the library is not supported. RS-485 Master olarak Arduino ile RS-<> MODBUS Seri İletişim (circuitdigest.com)

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