RAK5206, accessing linux, using gpio and UART

  • Good evening,

    I'm currently looking for informations about RAK5206, which seems to match most of my needs.
    However there are few elements not clear about we can do with.

    Are we able to access, modify and add side-application in the Linux- which is running on the board?
    If yes, how? Is it a partition of SD card?
    If no, what is the purpose of GPIO, PWM and UART available on connector P1?

    Thanks you for your time

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