Unit CatM

  • There is no serial response from this unit. No answer to AT @ 115200. Any idea?

  • Hello @ckuehnel

    could you share some additional information? E.g.

    • which M5Stack core is it connected to?
    • which Groove port are you using?
    • how do you initialize the serial connection?
    • which GPIOs are you using for TX and RX?
    • could you share your UiFlow or Arduino code?

    Also these SIM7xxx modems take some time to initialize before they react to AT commands. Try sending the AT command a couple of times.