ESP32 HttpClient compile error

[mikeysklar]

Forum issue with ESP32 BSP 3.1.0 no longer compiling with basic AdafruitIO_WiFi constructor being used. The previous ESP32 BSP 3.0.7 works fine.

I set the board to Feather ESP32 v2, but any ESP32 will likely show the same response.

minimum viable code (thx paolometeo):

#include <SPI.h>
#include <Wire.h>
#include <WiFiManager.h>
#include "AdafruitIO_WiFi.h"
#include <Preferences.h>

// Replace these with your actual Adafruit IO credentials and WiFi details
#define IO_USERNAME    "your_username"
#define IO_KEY         "your_aio_key"
#define WIFI_SSID      "your_wifi_ssid"
#define WIFI_PASS      "your_wifi_password"

// Initialize Adafruit IO with WiFi
AdafruitIO_WiFi io(IO_USERNAME, IO_KEY, WIFI_SSID, WIFI_PASS);

void setup(){}
void loop(){}

error message:

/Users/sklarm/Documents/Arduino/libraries/Adafruit_IO_Arduino/src/wifi/AdafruitIO_ESP32.cpp: In constructor 'AdafruitIO_ESP32::AdafruitIO_ESP32(const char*, const char*, const char*, const char*)':
/Users/sklarm/Documents/Arduino/libraries/Adafruit_IO_Arduino/src/wifi/AdafruitIO_ESP32.cpp:25:53: error: invalid new-expression of abstract class type 'HttpClient'
   25 |   _http = new HttpClient(*_client, _host, _http_port);
      |                                                     ^
In file included from /Users/sklarm/Documents/Arduino/libraries/ArduinoHttpClient/src/ArduinoHttpClient.h:8,
                 from /Users/sklarm/Documents/Arduino/libraries/Adafruit_IO_Arduino/src/AdafruitIO.h:27,
                 from /Users/sklarm/Documents/Arduino/libraries/Adafruit_IO_Arduino/src/wifi/AdafruitIO_ESP32.h:20,
                 from /Users/sklarm/Documents/Arduino/libraries/Adafruit_IO_Arduino/src/wifi/AdafruitIO_ESP32.cpp:16:
/Users/sklarm/Documents/Arduino/libraries/ArduinoHttpClient/src/HttpClient.h:41:7: note:   because the following virtual functions are pure within 'HttpClient':
   41 | class HttpClient : public Client
      |       ^~~~~~~~~~
In file included from /Users/sklarm/Library/Arduino15/packages/esp32/hardware/esp32/3.1.0/cores/esp32/Arduino.h:197,
                 from /Users/sklarm/Documents/Arduino/libraries/Adafruit_IO_Arduino/src/AdafruitIO_Dashboard.h:19,
                 from /Users/sklarm/Documents/Arduino/libraries/Adafruit_IO_Arduino/src/AdafruitIO.h:19:
/Users/sklarm/Library/Arduino15/packages/esp32/hardware/esp32/3.1.0/cores/esp32/Client.h:29:15: note:     'virtual int Client::connect(IPAddress, uint16_t, int32_t)'
   29 |   virtual int connect(IPAddress ip, uint16_t port, int32_t timeout) = 0;
      |               ^~~~~~~
/Users/sklarm/Library/Arduino15/packages/esp32/hardware/esp32/3.1.0/cores/esp32/Client.h:31:15: note:     'virtual int Client::connect(const char*, uint16_t, int32_t)'
   31 |   virtual int connect(const char *host, uint16_t port, int32_t timeout) = 0;
      |               ^~~~~~~
Multiple libraries were found for "WiFi.h"
  Used: /Users/sklarm/Library/Arduino15/packages/esp32/hardware/esp32/3.1.0/libraries/WiFi
  Not used: /Users/sklarm/Documents/Arduino/libraries/WiFiNINA

+---------------------------+----------------------+
| Name                      | Version              |
+---------------------------+----------------------+
| macOS Ventura             | 13.6.7               |
| Arduino IDE               | 2.3.4                |
| WiFi                      | 3.0.7                |
| SPI                       | 3.0.7                |
| Wire                      | 3.0.7                |
| WiFiManager               | 2.0.17               |
| Networking                | 3.0.7                |
| Update                    | 3.0.7                |
| WebServer                 | 3.0.7                |
| FS                        | 3.0.7                |
| DNSServer                 | 3.0.7                |
| ESP32 Async UDP           | 3.0.7                |
| Adafruit IO Arduino       | 4.3.0                |
| Adafruit MQTT Library     | 2.5.8                |
| ArduinoHttpClient         | 0.6.1                |
| NetworkClientSecure       | 3.0.7                |
| Preferences               | 3.0.7                |
+---------------------------+----------------------+

[brentru]

@mikeysklar Hi, thank you for the bug report!

This is directly related to arduino-libraries/ArduinoHttpClient#182

A PR has been merged to revert the breaking change in the esp32 platform's Client API: espressif/arduino-esp32#10776

This has been released as part of Arduino ESP32 BSP v3.1.1 based on ESP-IDF v5.3.2 - https://github.com/espressif/arduino-esp32/releases/tag/3.1.1

Please instruct any forum user experiencing issues to update to the latest version of ESP32 BSP, 3.1.1 or above.