That's an ESP8266 which has an Xtensa MCU, and as of today Embedded Swift doesn't support Xtensa (only RISC-V MCUs from the ESP family are supported). See Is there support for Xtensa LX7 cores?
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That's an ESP8266 which has an Xtensa MCU, and as of today Embedded Swift doesn't support Xtensa (only RISC-V MCUs from the ESP family are supported). See Is there support for Xtensa LX7 cores?