Comments on: ESP-NOW with ESP32: Send Data to Multiple Boards (one-to-many) https://randomnerdtutorials.com/esp-now-one-to-many-esp32-esp8266/ Learn ESP8266, ESP32, Arduino, and Raspberry Pi Thu, 12 Jun 2025 19:34:12 +0000 hourly 1 https://wordpress.org/?v=6.8.1 By: Michael https://randomnerdtutorials.com/esp-now-one-to-many-esp32-esp8266/#comment-1057026 Thu, 12 Jun 2025 19:34:12 +0000 https://randomnerdtutorials.com/?p=95718#comment-1057026 Thank you! Downgrading the board installation solved my problem.
Kind Regards,
Michael

]]> By: Sara Santos https://randomnerdtutorials.com/esp-now-one-to-many-esp32-esp8266/#comment-1056465 Tue, 10 Jun 2025 21:34:02 +0000 https://randomnerdtutorials.com/?p=95718#comment-1056465 In reply to Michael.

Hi.
I’ll try it out again.
Meanwhile, try downgrading your ESP32 boards installations. Go to Tools > Boards > Boards Manager > Search for ESP32 and try previous versions.

Regards,
Sara

]]> By: Michael https://randomnerdtutorials.com/esp-now-one-to-many-esp32-esp8266/#comment-1056173 Mon, 09 Jun 2025 22:27:43 +0000 https://randomnerdtutorials.com/?p=95718#comment-1056173 Hi Rui and Sara,
Thank you for your excellent tutorials. I have been using ESP_NOW for several months successfully. This week the code no longer compiles on Arduino IDE.
I tried copying and compiling your sender example and received the same error:
Compilation error: invalid conversion from ‘void ()(const uint8_t, esp_now_send_status_t)’ {aka ‘void ()(const unsigned char, esp_now_send_status_t)’} to ‘esp_now_send_cb_t’ {aka ‘void ()(const wifi_tx_info_t, esp_now_send_status_t)’} [-fpermissive]

I assume there has been a change in a library somewhere. Can you help?
KInd Regards,
Michael

]]> By: Pierre-Yves MULLER https://randomnerdtutorials.com/esp-now-one-to-many-esp32-esp8266/#comment-924933 Thu, 13 Jun 2024 11:21:00 +0000 https://randomnerdtutorials.com/?p=95718#comment-924933 Hi,
I try your code (one ESP32 sender and 3 ESP8266 receiver) and it works fine ! Thank you.
But when I extend with 6 ESP8266 receiver I noticed on the Arduino IDE Serial Monitor of the ESP32 sender sent only 4 or sometime 5 “Delivery Success” message!
It looks like a timing jam… Do you have an idea why.
I would like to send data to 20 receivers IN THE SAME TIME! Can you provide me any help ?
Thank’s

]]> By: ADAM SZCZUROWSKI https://randomnerdtutorials.com/esp-now-one-to-many-esp32-esp8266/#comment-917597 Thu, 23 May 2024 15:39:05 +0000 https://randomnerdtutorials.com/?p=95718#comment-917597 Hi Sara.
I try to send data from One ESP32 Board to two ESP32
Exactly with your code. The problem is it sends data only for few meters distance.
In longer distance (~20m) I’m getting msg “Delivery Fail”
I use DEVKIT V1.
Could you tell me why?

]]> By: whispers https://randomnerdtutorials.com/esp-now-one-to-many-esp32-esp8266/#comment-875635 Mon, 04 Dec 2023 00:16:19 +0000 https://randomnerdtutorials.com/?p=95718#comment-875635 Great tutorial.. Is it possible to add “auto-peer” stuff to this? Or do you need to connect to a real/live ‘network’ (username/password required) to do such a thing?

Close to this tutorial:
https://randomnerdtutorials.com/esp-now-auto-pairing-esp32-esp8266/

but I dont need any ‘server’
no connect to a wifi/ssid (name/password)..etc (all just local ESP32 devices)

Q: Or do you -have- to connect to a network (name/password) to actually do the auto-pairing stuff in the other tutorial? (I liked everything but dont need server stuff..and no outside network connection…everything local to ESP32 boards) Adding the ‘peers’ to a list was nice so you can loop through or randomly pick one..etc.

In this tutorial.. only thing I dont understand yet is how to dynamically grab these ‘peers’ addresses… and build a list dynamically?

THANKS!

]]> By: LaZorraTech https://randomnerdtutorials.com/esp-now-one-to-many-esp32-esp8266/#comment-862923 Thu, 28 Sep 2023 18:36:16 +0000 https://randomnerdtutorials.com/?p=95718#comment-862923 In reply to Saffanah Putri.

I’ve had issues sending to multiple boards if I am sending the messages one immediately after the other. It seems like the second message doesn’t get transmitted as it is still dealing with the first. Have you tried adding a delay between sending messages?

]]> By: Saffanah Putri https://randomnerdtutorials.com/esp-now-one-to-many-esp32-esp8266/#comment-861922 Fri, 22 Sep 2023 08:51:45 +0000 https://randomnerdtutorials.com/?p=95718#comment-861922 In reply to Felipe Paulino.

Hi Felipe, do you have discover the solution yet of this problem? I had the same problem as well.

]]> By: Steve https://randomnerdtutorials.com/esp-now-one-to-many-esp32-esp8266/#comment-858937 Thu, 07 Sep 2023 02:03:33 +0000 https://randomnerdtutorials.com/?p=95718#comment-858937 Hi Rui and Sara,
Thanks for all the great tutorials. I’m quite new to ESP32 and I’m trying to better understand the delay() that’s used at the end of the sender code. I’m seeing that some sort of delay is needed. If I remove delay(2000) then I see that the data isn’t transmitted and I get an error like the one below. For my project I want to transmit data as fast as possible to 10 receivers. Ideally 24bits would be transmitted to each receiver every 100ms. What’s the best way to do that? Thanks!

Error sending the data
E (107598) wifi: esf_buf: t=3 l=44 max:32, alloc:32 no eb, TXQ_BLOCK=2000
Error sending the data
E (107698) wifi: esf_buf: t=3 l=44 max:32, alloc:32 no eb, TXQ_BLOCK=2000
Error sending the data

]]> By: Nur https://randomnerdtutorials.com/esp-now-one-to-many-esp32-esp8266/#comment-845530 Thu, 06 Jul 2023 11:01:35 +0000 https://randomnerdtutorials.com/?p=95718#comment-845530 IM trying control servo with espnow, i’m use servo,potensiometer, esp32 and esp8266. Esp 32 and esp8266 successfully communication but why the servo can’t move ?. I’m use your code and little modify

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