ESPNOW_WIFI_IF is only defined in:

esp-idf/examples/wifi/espnow/main/espnow_example.h

and no where in arduino-esp32.

/* ESPNOW can work in both station and softap mode. It is configured in menuconfig. */
#if CONFIG_STATION_MODE
#define ESPNOW_WIFI_MODE WIFI_MODE_STA
#define ESPNOW_WIFI_IF ESP_IF ...

Well, a small success in figuring this out.

Turns out the esp-now code in the arduino examples that I copied did not check for:

ESP_ERR_ESPNOW_IF : current WiFi interface doesn't match that of peer

That is the error I'm getting.


typedef struct esp_now_peer_info {
uint8_t peer_addr[ESP_NOW_ETH ...

Not off topic at all --- thanks.
I remembered reading something about that somewhere, but did not remember where.
I don't really understand why MAC addresses need to be changed, though.

I don't suppose that 0 or 1 added to MAC is the "state" that is mentioned here:
https://github.com/espressif/esp ...

Thanks. I've been looking at that for a while now and also the "esp-now_user_guide_.pdf", but some of the terminology, names and methods seem very different.

Haven't quite figured out what is meant by "state" --- is that wifi mode like AP or STA?

I have a 'supposedly' sucessful pair from the slave ...

Re-posting in ESP Arduino
Robby

Tried esp_now_add_peer in 'slave' module, now I get:

Send Status: Not sure what happened

I set:
peer.peer_addr to mac address of master
peer.channel to same channel as master ?? not sure if this should be different
peer.encrypt to 0

Wondering if I should delete this post and repost in ESP32 ...

No I didn't. I'll try that right now.

I just realized that I posted this in the wrong forum --- SDK instead of Arduino. Can I change that?

Thanks, Robby

Hello,
I'm trying to get 2 ESP32 Dev Boards to talk to each other.

I started with the master-slave examples from the Arduino IDE, and got that working fine. In that example 'master' is set to STA, and 'slave' is set to AP. 'Master' sends a message to 'slave', and 'slave' prints the message to ...