How to use C/C++ PlatformIO/Arduino Framework (Not MaixPy) to use wifi

[marcusobrien]

Hi,

How can I use the ESP32 Wifi module from C/C++ ? It only seems to work using the MaixPy wifi example. When I run the default ESP32 firmware, and this C++ application code

` Serial.begin(115200); // initialize serial for debugging
WiFi.init(); // initialize ESP32 WiFi module

if (WiFi.status() == WL_NO_SHIELD)
{
Serial.println("No WiFi HW - Halting FW");
while (true);
}

int8_t numberNetworks = WiFi.scanNetworks();
Serial.print("Scan Wifi Found : ");
Serial.println(numberNetworks);`

This just prints the following output....

Error 4
Scan Wifi Found: 0

Note that the wifi works if I use MaixPy firmware and the example code. Also I have 2 Maixduinos both of them dont work with the C++ SDK, but both work with the Python way.

Where is the ESP32 FW that will allow me to use the wifi from the Maixduino C/C++ application ?

[romainreignier]

See my comment #87 (comment)

[marcusobrien]

See my comment #87 (comment)

Hi - So which firmware do I put on the ESP32 on the Maixduino ? My ESP32 doesnt have the original firmware anymore - as I've been experimenting with lots of different ones - there are 4 prebuilt binaries in the Maixduino web portal - do I sue one of those ? ie https://dl.sipeed.com/shareURL/MAIX/factory_firmware/esp32

Has the following
maixduino_esp32_firmware_v1.4.1_0x0.bin
maixduino_esp32_firmware_v1.4.0.bin
NINA_W122_33.bin
NINA_W122_25.bin

"I have managed to communicate it with the fork of WiFiEsp (branch esp32_spi) by @scpcom and using its fork of Maixduino."

Then you mention you have used two repos to talk to the Wifi, I'm not sure how I get this working. I have some demo code (as above), but once I have the above FW on the ESP32, do I just use this repo as the platform io library (branch esp32_spi) ?

https://github.com/scpcom/WiFiEsp/tree/esp32_spi

Or this one - the fork you mentioned ?

https://github.com/scpcom/Maixduino

[scpcom]

Yes, my fork of WifiEsp is integrated into my fork of Maixduino:
https://github.com/scpcom/Maixduino/releases
It may work standalone but using my board package is the easiest way.
PS: If the package is installed an the board is selected in the Arduino IDE you can open the Tools menu and change the new option "WiFi Driver" to SPI