How dual interface works? (UART+UART/UART+SPI/UART+SDIO)?

Primary interface is used for sending AT commands to GS and the second interface is used for data transmission and reception. Here, second interface will accept AT commands but we recommend to issue AT commands through primary interface. Primary interface can only accept commands only after the secondary interface is up and HOST receives 'DataInterfaceReady' message through second interface.

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