This firmware uses Espressif's IDF

1. Download the ESP32 toolchain
2. Extract it and add it to your PATH: export PATH=$PATH:<path/to/toolchain>/bin
3. Clone v3.3.1 of the IDF: git clone --branch v3.3.1 --recursive https://github.com/espressif/esp-idf.git
4. Set the IDF_PATH environment variable: export IDF_PATH=<path/to/idf>
5. Run make to build the firmware (in the directory of this read me)
6. Load the Tools -> SerialNINAPassthrough example sketch on to the board
7. Use esptool to flash the compiled firmware

If updating the NINA firmware for an Arduino UNO WiFi Rev. 2 or Arduino Nano RP2040 board via SerialNINAPassthrough sketch, then the esptool invocation needs to be changed slightly:

-  --baud 115200 --before default_reset
+  --baud 115200 --before no_reset

The make command produces a bunch of binary files that must be flashed at very precise locations, making esptool commandline quite complicated. Instead, once the firmware has been compiled, you can invoke combine.py script to produce a monolithic binary that can be flashed at 0x0.

make
python combine.py

This produces NINA_W102.bin file (a different name can be specified as parameter). To flash this file you can use https://arduino.github.io/arduino-fwuploader/2.2/usage/#firmware-flashing

git clone https://android.googlesource.com/platform/system/ca-certificates
cp nina-fw/tools/nina-fw-create-roots.sh ca-certificates/files
cd ca-certificates/files
./nina-fw-create-roots.sh
cp roots.pem ../../nina-fw/data/roots.pem

cd tools
./sslcheck.sh -c ../data/roots.pem -l url_lists/url_list_moz.com.txt -e

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