ESPNOW compiles for ESP8266 but not ESP32

Projects Libraries
1

Hi All:

Frustrating issue, have been using espressif espnow successfully with Generic ESP8266 dev boards. When trying to verify/compile for a ESP32 (Pico-D4 board) the compiler flags espnow.h as a file not found, tried other ESP32 boards - same issue.

Switching back to the ESP8266 board and all is good. I've closed and re-started the IDE, reinstalled the library, reinstalled the boards, etc. I even pulled out an old Win10 laptop - loaded the latest Arduino IDE, espnow library and boards - same compiling issue with the ESP32. Pretty stumped here!

Details:

  • Arduino IDE 2.3.2 2/20/24 update
  • Boards Mgr
    • Esp8266 by ESP8266 ver 3.1.2 installed
    • Esp32 by Espressif ver 2.0.14 installed (tried using older versions, no luck)
  • Boards selected:
    • Generic ESP8266 Module
    • ESP32 Pico-D4

ESP32 compiling error: compilation terminated. exit status 1
Compilation error: espnow.h: No such file or directory

Test code below...

// ESP32 TEST TO GET ESPNOW.H TO BE RECONGIZED BY THE ARDUINO IDE COMPILER


#include <espnow.h>

uint8_t senderMac[] = { };               //NOT NEEDED

void setup() {
  Serial.begin(9600);

  esp_now_init();
  esp_now_set_self_role(ESP_NOW_ROLE_SLAVE);
  esp_now_register_recv_cb(onDataReceived);
}

void onDataReceived(uint8_t *senderMac, uint8_t *data, uint8_t len) 
{
  Serial.print("DATA RECEIVED: ");
  
}
2

Welcome to the forum

For the ESP32 the name of the library is esp_now.h rather than espnow.h

3

Another welcome also from me!

Bob got there first, but my digging around also suggests the same. Try using the alternate header name or perhaps use an #if defined() statement to determine which one to load for the given platform:

  #if defined(ESP32)
    #include <esp_now.h>
  #elif defined(ESP8266)
    #include <espnow.h>
  #endif
1 Like
4

Thx so much for the code snippet, makes sense now! There are various web comments about esp_now changing over to espnow without clarifying about being dev board specific....

BTW - in the downloaded library, the only src folder file is espnow.h

5

I assume that there is a reason for the library names being different but can't imagine what the reason would be

6

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