How to build everything from source instead of static libraries?

[piotrkundu]

This project is based on pre-built static libraries, which means you can't make any changes.
I would like to change the UUID for BT SPP and use it in Arduino https://github.com/espressif/esp-idf/blob/master/components/bt/host/bluedroid/api/esp_spp_api.c#L26

The function I want to modify is esp_spp_start_discovery and the source is here:
https://github.com/espressif/esp-idf/blob/6517c5033aab27afe491e433d6beeba93dfb1aa7/components/bt/host/bluedroid/api/esp_spp_api.c#L71

How?
Ideally I would like to rebuild everything from source in Arduino every-time I build. Alternatively I would like to build ~/Documents/Arduino/hardware/espressif/esp32/tools/sdk/lib/libbt.a from source.

[atanisoft]

Short answer... Not possible in Arduino IDE...

Longer answer.. You have two options:

1. Use Arduino as an IDF component, documented here.
2. Use PlatformIO IDE with the development version of the Espressif32 platform using the framework setting as "espidf, arduino" and having the sdkconfig.h in your src directory.

Option 2 is a lot easier to setup and maintain over the long term. As an added bonus you will get a full fledged IDE.

[lbernstone]

option 2
option 3) If you copy the relevant c-code and headers from esp-idf and place them in your sketch folder, they will override the functions in the libraries.

[atanisoft]

for option 3, make sure to use the correct version of esp-idf... currently set to the 3.2 release branch..

[piotrkundu]

I tried to build libbt.a in CLion and then copy them to ~/Library/Arduino15/packages/esp32 folder structure. Since my esp-idf is latest master (v4) and the Arduino libs are v3.x I got a lot of missing symbols so I had to build and copy another 3 libs. Of course once I got a ELF file built and flashed it didn't work, so I kind of dropped that for now.

@atanisoft Arduino is great for hobbyists or some rapid prototyping. I was just surprised that the binaries (libs) are checked into git in arduino-esp32 and the folder structure is flattened to just sdk/lib. When you build these libraries with cmake, idf.py or CLion the libs are build into a folder structure of esp-idf/component_name/libxxx.a. I guess I could copy *.a from esp-idf to ~/Library/Arduino15/packages/esp32

For Option 2, I've actually installed Visual Studio Code, PlatformIO and ESP32 component. That's a good free option as well.

[atanisoft]

Since you have CLion, I'd suggest use the PIO plugin for it and you can follow the same options for #2.

[piotrkundu]

Got everything I need up and running in CLion - no luck with Arduino IDE.

[RdlP]

I am facing a similar problem. I want to re-compile libbt and replace it in the arduino library folder. But my problem is how I can build the libbt.a library?