Comments on: ESP32 Client-Server Wi-Fi Communication Between Two Boards

By: Kees van de Werken

Kees van de Werken — Tue, 25 Feb 2025 11:14:13 +0000

From my compiler i get the folowing error messages in the send ino
C:\Users\keesv\OneDrive\Documenten\Arduino\Wifi_send\Wifi_send.ino: In function ‘void setup()’:
C:\Users\keesv\OneDrive\Documenten\Arduino\Wifi_send\Wifi_send.ino:58:8: error: ‘class WiFiClass’ has no member named ‘softAP’
58 | WiFi.softAP(ssid, password);
| ^~~~~~
C:\Users\keesv\OneDrive\Documenten\Arduino\Wifi_send\Wifi_send.ino:60:23: error: ‘class WiFiClass’ has no member named ‘softAPIP’
60 | IPAddress IP = WiFi.softAPIP();

By: yona Gy

yona Gy — Mon, 28 Oct 2024 16:35:26 +0000

Still working on the project: I tried to modify the code and generated the code. I created an H file that contains 3 methods, that contains the code from the SETUP and LOOP methods and is used as API. From which the problematic is the “serverBegin”:
”
bool serverBegin() {
WiFi.softAP(ssid, password);
IPAddress IP = WiFi.softAPIP();
server.on(“/command”, HTTP_GET,
(AsyncWebServerRequest request) { request->send_P(200, “text/plain”, commandGenerator()); });
server.begin(); // Start server
return HIGH;
}
”
Where “commandGenerator()” is an external method that returns a string of 30 characters.
The errors now are:
”
ESP32_WIFI.h:49:28: error: expected primary-expression before ‘‘ token
49 | (AsyncWebServerRequest request) { request->send_P(200, “text/plain”, commandGenerator()); });
ESP32_WIFI.h:49:29: error: ‘request’ was not declared in this scope
49 | (AsyncWebServerRequest *request) { request->send_P(200, “text/plain”, commandGenerator()); });
”
Both error pointers point to the term “request” of the “server.on” statement.

I realy need assistance and appreciate it very much.
Regards
Yona

By: Yona Gy

Yona Gy — Fri, 25 Oct 2024 12:20:51 +0000

Dear Rui and Sara;
Thanks for this project’ as well as for all other projects.

I’m trying to implement the project using ESP32C3 on Arduino IDE 2.3.2. I have a problem in the following lines:
server.on(“/command”, HTTP_GET,
[](AsyncWebServerRequest* request) {request->send_P(200, “text/plain”, readCommand().c_str()); });
Where the compiler issues the following errors:
In file included from
E:\Current\Tractor\SWtractorCombined_V1.0\src\ESP32_WIFI\ESP32_WIFI.ino:13:
E:\src\ESP32_WIFI\ESP32_WIFI.h: In lambda function:
E:\Current\Tractor\SWtractorCombined_V1.0\src\ESP32_WIFI\ESP32_WIFI.h:35:51:
error: ‘this’ was not captured for this lambda function 35 | request->send_P(200,
“text/plain”, readCommand().c_str());
| ~~~~~~~~~~~^~
E:\Current\Tractor\SWtractorCombined_V1.0\src\ESP32_WIFI\ESP32_WIFI.h:35:51:
error: cannot call member function ‘String localWifiP::readCommand()’ without object
How can I change the Lambda into simple functions call statement?

Best regards
Yona

By: Tony

Tony — Mon, 05 Aug 2024 14:22:03 +0000

Bonjour Sara, j’ai essayé ce tutoriel et tout fonctionne très bien. Comme tous les autres que j’ai essayé. La question que je me pose sur le principe client serveur est:
Peut-on renvoyer des données de capteurs du client vers le serveur et par quelle méthode.
Merci

By: Sara Santos

Sara Santos — Mon, 01 Jul 2024 10:07:05 +0000

In reply to feune karren.

Hi.
I think maybe your display is not the one with the SSD1306 driver. Can you double-check that?
If it doesn’t come with the SSD1306 driver, you’ll need a different library to make it work.
Regards,
Sara

By: feune karren

feune karren — Sun, 30 Jun 2024 18:34:45 +0000

Hello thanks for this awesome tutorial. i am encounting some errors when showing the temp, pressure and humidiy on the oled i2c. i used 1.3 inch rather than a 0.91 inch and then parameters doesnt show all. how can i solve it please?

By: Daniel

Daniel — Wed, 03 Apr 2024 19:20:19 +0000

Hi Rui and Sara!
Obrigado pelos vários tutoriais disponíveis nos seu canal!
Gostaria de saber se tem como fazer a comunicação entre 2 ESPs usando o roteador. Obrigado

By: sz

sz — Thu, 29 Feb 2024 21:22:04 +0000

In reply to Sara Santos.

Hello
I am facing the same problem
no nearby wi-fi networks
any suggestion

By: Sara Santos

Sara Santos — Thu, 04 Jan 2024 10:40:29 +0000

In reply to Francisco.

Thank you.
Regards,
Sara

By: Francisco

Francisco — Wed, 03 Jan 2024 21:56:43 +0000

Dear Rui and Sara;
Thanks again for all your rnd initiatives.
I adapted this project to the BMP180 sensor and works fine.
Happy new year!
Kurro.