Hi Dennis.
Do you have more information about the error?
Regards,
Sara

Sara:
The code I’m using is from the RNT website:

// Send message via ESP-NOW
  esp_err_t result = esp_now_send(broadcastAddress, (uint8_t *) &myData, sizeof(myData));
   
  if (result == ESP_OK) {
    Serial.println("Sent with success");
  }
  else {
    Serial.println("Error sending the data");
  }

It sends ok at first and then I get the message “Error sending the data”. I added a line to print the variable called result and it is 12396.

Thanks,
Dennis

That error number is not useful as it relies on ESP_ERR_WIFI_BASE of your particular ESP32. You have to use the constants provided by espnow.h.
 
According to the ESP-NOW documentation and the espnow.h file on GitHub you will need to figure out the actual error. You can use a switch statement or an if block to print the actual error. For example (You should be able to add the rest of the error messages here):
 

if(result == ESP_ERR_ESPNOW_NOT_INIT) {
   Serial.println("ESPNOW is not initialized");
}
else if(result == ESP_ERR_ESPNOW_ARG) {
   Serial.println("invalid argument");
}
else if(blah, blah, blah

Ok, well it’s now started working.  I moved the unit out to it’s permanent home, and it’s now on a different power supply, so maybe it was a power supply issue.  Anyways, thanks for your help.

Hi Dennis.
That’s great that the issue is solved.
I’ll close this issue. If you need further help, you just need to open a new question in our forum.
Regards,
Sara