Introduction The official NuttX documentation seems to be incomplete. Therefore I listed here the steps I did to get NuttX working under Ubuntu 18.04. Prerequisites sudo apt install \ bison flex gettext texinfo libncurses5-dev libncursesw5-dev \ gperf automake libtool pkg-config build-essential gperf genromfs \ libgmp-dev libmpc-dev libmpfr-dev libisl-dev binutils-dev libelf-dev \ libexpat-dev gcc-multilib g++-multilib picocom u-boot-tools util-linux KConfig frontend Clone the tools repository: git clone https://bitbucket.org/nuttx/tools.git Build KConfig frontend: cd tools/kconfig-frontends ./configure --enable-mconf --disable-nconf --disable-gconf --disable-qconf make sudo make install sudo echo 'include /usr/local/lib' >> /etc/ld.so.conf sudo ldconfig Toolchain Follow the first 4 steps in https://docs.espressif.com/projects/esp-idf/en/latest/esp32/get-started/ Then, run the following to add ESP32 toolchain to PATH get_idf Get NuttX mkdir nuttx cd nuttx git clone https://github.com/apache/incubator-nuttx.git nuttx git clone https://github.com/apache/incubator-nuttx-apps apps Initialize Configuration List pre-existing configurations: ./tools/configure.sh -L | less Choose a configuration: ./tools/configure.sh -l esp32-devkitc:nsh make menuconfig Build NuttX make Flash to ESP32 esptool.py --chip esp32 elf2image --flash_mode dio --flash_size 4MB -o ./nuttx.bin nuttx wget -O bootloader.bin https://github.com/saramonteiro/esp32_binaries_nuttx/blob/main/bootloader.bin?raw=true wget -O partitions.bin https://github.com/saramonteiro/esp32_binaries_nuttx/blob/main/partitions.bin?raw=true esptool.py --chip esp32 --port /dev/ttyUSB0 --baud 115200 write_flash 0x1000 bootloader.bin 0x8000 partitions.bin 0x10000 nuttx.bin Access NuttShell minicom /dev/ttyUSB0 -b 115200 References https://nuttx.apache.org/docs/latest/quickstart/index.html https://blog.csdn.net/u010947832/article/details/111572602 https://medium.com/the-esp-journal/getting-started-with-esp32-and-nuttx-fd3e1a3d182c https://medium.com/the-esp-journal/blink-led-on-esp32-with-rtos-nuttx-d33c7dc62156 https://www.youtube.com/playlist?list=PLd73yQk5Fd8JEsVD-lhwYRQKVu6glfDa8

I recently came across this tiny ESP32 deb board on Taobao. It is priced at only 16 RMB but it has all the necessary features including a CH340 chip and a charging chip with a JST-PH battery connector. On Taobao it seems to have the following name: It came without any documentation. It took me a while to find out that it is a Wemos Lolin32 Lite board that is no longer maintained by Wemos. The official information about the board can only be found on archive.org at here. The schematics is attached here.

Connecting an ESP32 to a WPA2 Enterprise WiFi requires a bit more configuration than other more common WiFi protocols like WPA PSK or WPA2 PSK. The code below has been tested on NUS_STU, which is a WPA2 Enterprise access point with PEAP, no certificate, and MSCHAPV2. #include "esp_wpa2.h" #include <WiFi.h> #include <HTTPClient.h> #define EAP_IDENTITY "e1234567a" #define EAP_PASSWORD "nusnet-pswd" const char *ssid = "NUS_STU"; void setup() { Serial.begin(115200); delay(10); Serial.println(); Serial.println(ssid); WiFi.disconnect(true); WiFi.mode(WIFI_STA); esp_wifi_sta_wpa2_ent_set_identity((uint8_t *)EAP_IDENTITY, strlen(EAP_IDENTITY)); esp_wifi_sta_wpa2_ent_set_username((uint8_t *)EAP_IDENTITY, strlen(EAP_IDENTITY)); esp_wifi_sta_wpa2_ent_set_password((uint8_t *)EAP_PASSWORD, strlen(EAP_PASSWORD)); esp_wpa2_config_t config = WPA2_CONFIG_INIT_DEFAULT(); esp_wifi_sta_wpa2_ent_enable(&config); Serial.println("MAC address: "); Serial.println(WiFi.macAddress()); WiFi.begin(ssid); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.println("IP address: "); Serial.println(WiFi.localIP()); HTTPClient http; String serverPath = "http://ip-api.com/line"; http.begin(serverPath.c_str()); int httpResponseCode = http.GET(); if (httpResponseCode > 0) { Serial.print("HTTP Response code: "); Serial.println(httpResponseCode); String payload = http.getString(); Serial.println(payload); } else { Serial.print("Error code: "); Serial.println(httpResponseCode); } http.end(); String payload = http.getString(); Serial.println(payload); } void loop() {}