• What you're doing sounds pretty much spot on, including baud rate.

    In addition to what Robin says, things I can think are:

    • You don't have GND connected together on everything
    • You don't have a powerful enough 3.3v voltage source for the ESP8266 - I'm not sure but RAK8212 may not have a powerful voltage regulator
    • RX/TX pin are swapped?

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