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connect to the nRF52840-DK with the STM32F103 development board

Hi, recently I want to establish a connection between two development boards (STM32F103 + nRF52840-DK), that the STM32f103 board can create the data and send it to the nRF52840-DK, the openwsn has been ported to the nRF52840-DK. I want to combine development boards and Component wireless sensor networks. But I find that the nRF52840-DK has only one usart port pin(reference datasheet), If there has the other UARTport I don't find, please correct me. So I want to use other communication protocols (like I2C and SPI, etc). But I am not familiar with 52840 programming, I hope I can provide some help.