ESP-NOW ist using Espressif OUI 0x18fe34 at two positions:
------------------------------------------------------------------------------------------------------------
| MAC Header | Category Code | Organization Identifier | Random Values | Vendor Specific Content | FCS |
------------------------------------------------------------------------------------------------------------
and
-------------------------------------------------------------------------------
| Element ID | Length | Organization Identifier | Type | Version | Body |
-------------------------------------------------------------------------------
(found here: https://docs.espressif.com/projects/esp ... p_now.html)
The API just allows sending the Body. But it would be very important to send the Vendor Specific Content with an own IEEE-SA registered OUI.
Sending and receiving with an own OUI will simplify sorting out foreign ESP-NOW frames from other vendors and/or applications.
ESP-NOW, custom OUI
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Espressif Systems is a fabless semiconductor company providing cutting-edge low power WiFi SoCs and wireless solutions for wireless communications and Internet of Things applications. ESP8266EX and ESP32 are some of our products.