UART communication between Lopy and Arduino

  • Good afternoon to all,

    I already programmed two Lopy's communicating between each other: the first one gets GPS data and sends it using LORAMAC to the second one.

    Now i would like to make a serial communication between that second Lopy and a Sodaq Mbili Arduino board that would send to via LTE network.

    The thing is I hardly understand the link between UART, USB, I2C etc. Could anyone help me please?
    Thanks to anyone and have a good day,

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