esp32 3.0.0 Compilation error from esp_now.h with function call esp_now_register_recv_cb

[rhit-jaegerba]

Board

ESP32C3 Dev Module

Device Description

Basic ESP32-C3-DevKit https://docs.espressif.com/projects/esp-idf/en/latest/esp32c3/hw-reference/esp32c3/user-guide-devkitm-1.html

Hardware Configuration

No other Hardware Attached

Version

v3.0.0

IDE Name

Arduino IDE 2.3.2

Operating System

Windows 10

Flash frequency

80 MHz

PSRAM enabled

yes

Upload speed

921600

Description

Using This Example https://randomnerdtutorials.com/esp-now-esp32-arduino-ide/ For receiving and transmitting via ESPNow The ESP32 Receiver Sketch (ESP-NOW) no longer compiles after the update to 3.0.0 due to issues within esp_now.h, verified that the sketch compiles correctly on version 2.0.17.

Sketch

/*
  Rui Santos
  Complete project details at https://RandomNerdTutorials.com/esp-now-esp32-arduino-ide/

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files.

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
*/

#include <esp_now.h>
#include <WiFi.h>

// Structure example to receive data
// Must match the sender structure
typedef struct struct_message {
    char a[32];
    int b;
    float c;
    bool d;
} struct_message;

// Create a struct_message called myData
struct_message myData;

// callback function that will be executed when data is received
void OnDataRecv(const uint8_t * mac, const uint8_t *incomingData, int len) {
  memcpy(&myData, incomingData, sizeof(myData));
  Serial.print("Bytes received: ");
  Serial.println(len);
  Serial.print("Char: ");
  Serial.println(myData.a);
  Serial.print("Int: ");
  Serial.println(myData.b);
  Serial.print("Float: ");
  Serial.println(myData.c);
  Serial.print("Bool: ");
  Serial.println(myData.d);
  Serial.println();
}

void setup() {
  // Initialize Serial Monitor
  Serial.begin(115200);

  // Set device as a Wi-Fi Station
  WiFi.mode(WIFI_STA);

  // Init ESP-NOW
  if (esp_now_init() != ESP_OK) {
    Serial.println("Error initializing ESP-NOW");
    return;
  }

  // Once ESPNow is successfully Init, we will register for recv CB to
  // get recv packer info
  esp_now_register_recv_cb(OnDataRecv);
}

void loop() {

}

Debug Message

C:\Users\jaegerba\AppData\Local\Temp\.arduinoIDE-unsaved2024431-9968-ilie0.szczid\sketch_may31b\sketch_may31b.ino: In function 'void setup()':
C:\Users\jaegerba\AppData\Local\Temp\.arduinoIDE-unsaved2024431-9968-ilie0.szczid\sketch_may31b\sketch_may31b.ino:58:28: error: invalid conversion from 'void (*)(const uint8_t*, const uint8_t*, int)' {aka 'void (*)(const unsigned char*, const unsigned char*, int)'} to 'esp_now_recv_cb_t' {aka 'void (*)(const esp_now_recv_info*, const unsigned char*, int)'} [-fpermissive]
   58 |   esp_now_register_recv_cb(OnDataRecv);
      |                            ^~~~~~~~~~
      |                            |
      |                            void (*)(const uint8_t*, const uint8_t*, int) {aka void (*)(const unsigned char*, const unsigned char*, int)}
In file included from C:\Users\jaegerba\AppData\Local\Temp\.arduinoIDE-unsaved2024431-9968-ilie0.szczid\sketch_may31b\sketch_may31b.ino:12:
C:\Users\jaegerba\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.1-442a798083/esp32c3/include/esp_wifi/include/esp_now.h:157:54: note:   initializing argument 1 of 'esp_err_t esp_now_register_recv_cb(esp_now_recv_cb_t)'
  157 | esp_err_t esp_now_register_recv_cb(esp_now_recv_cb_t cb);
      |                                    ~~~~~~~~~~~~~~~~~~^~

exit status 1

Compilation error: invalid conversion from 'void (*)(const uint8_t*, const uint8_t*, int)' {aka 'void (*)(const unsigned char*, const unsigned char*, int)'} to 'esp_now_recv_cb_t' {aka 'void (*)(const esp_now_recv_info*, const unsigned char*, int)'} [-fpermissive]

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• [X] I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[lucasssvaz]

Please use the new ESP NOW library and examples included in 3.0.0. The new version has many breaking changes

https://github.com/espressif/arduino-esp32/tree/master/libraries%2FESP_NOW%2Fexamples

[schwabe58]

Is the new library downward compatible to recent version, a.e. 2.0.17? My answer after a very first view: No So I have to change existing code, isn't it? Please provide a workaround for this case.

[me-no-dev]

You need to change code anyway. You were using ESP-IDF APIs before and you either have to update to the new ESP-IDF APIs or use our library from now on.