jwachlin / esp-now-example

A simple example using ESP-Now on the ESP32 with Arduino

esp-now-example

A simple example using ESP-Now on the ESP32 with Arduino

It took me a long time to get ESP-Now working, so I wanted to share a simple example to hopefully speed up the process for others. This example uses no security and simply broadcasts packets, but can be easily modified to send arbitrary data.

esp-now-example's Issues

Brilliant Example, but "peer interface is invalid" and assignment at line 144

A ready made example to get to the point where something works is great - thank you very much

Maybe libraries have changed over the last two years, but here are two issues I found and fixed/bodged

The "peer interface is invalid" message happened in network_setup()
Fixed by moving esp_now_peer_info_t peer_info; line 141 out of the actual sketch code and inserted below line 48

Arduino compiler gave an error:
cannot convert 'esp_interface_t' to 'wifi_interface_t' in assignment. for line 144
peer_info.ifidx = ESP_IF_WIFI_STA;

Fixed by commenting it out. Not sure what that assignment was meant to do; I'll investigate later
Some hours later:
turns out at that point in the code both peer_info.ifidx & ESP_IF_WIFI_STA are zero
so no harm done there, or does someone know different?

Anyway, with those two things settled there are flashing LEDs aplenty as they casually chat amongst themselves.
Cheers and thanks