I created a new ESP-IDF project and replaced the empty.c file with example_spp_acceptor_demo.c from: framework-espidf\examples\bluetooth\bluedroid\classic_bt\bt_spp_acceptor\ Unfortunately the example does not compile, because it includes esp_bt.h and compiler is not told to look into framework…

Thank you for the hint. Yes, it looks like the issue you linked above. In the meantime I solved it by manually editing sdkconfig file. I added following flags (which were commented out): CONFIG_BT_ENABLED=y CONFIG_BT_CLASSIC_ENABLED=y CONFIG_BT_SPP_ENABLED=y

maxgerhardt March 29, 2020, 6:11pm 2

Seems like the same as: Installing ESP-IDF 4.0 in platformio - #7 by AussieSusan

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Bluetooth with ESP-IDF (fatal error: esp_bt.h: No such file or directory)