acknowledgments and references

README.md

@@ -3,6 +3,11 @@ A Linux network interface device for communication over the ESP-Now wireless bro
 
 NOTE: This is EXTREMELY work in progress and as it requires root permissions is not recommended to be run unmonitored.
 
+This code would not be possible without the groundwork done by the [Linux-ESPNOW](https://hackaday.io/project/161896-linux-espnow)[[github](https://github.com/thomasfla/Linux-ESPNOW)] project. They put in a huge amount of work to reverse engineer the ESP-Now protocol and provided some [example code](https://github.com/thomasfla/Linux-ESPNOW) that this was heavily based on.
+
+Additionally [this article by John Millikin](https://john-millikin.com/creating-tun-tap-interfaces-in-linux)
+was an extremely helpful refresher on working with a Tun/Tap interface.
+
 # Build
 ```
 git clone https://git.oit.cloud/morgan/ifnow.git
@@ -31,3 +36,13 @@ be used to intercept raw packets but if used with LwIP on the ESP32 end, which c
 [esp_netif_now](https://git.oit.cloud/morgan/esp_netif_now), any IP stack should work. Has been testing
 with UDP and some [CoAP](https://libcoap.net). There are definitely still issues with parsing some incoming
 packets.
+
+# Reference Material
+These are resources I relied on during development to help me better understand the
+Linux network interface stack. Unfortunately there is not a lot of reference material on ESP-Now,
+Espressif only ships a binary blob and header file.
+
+### UDP/IP Stack
+* [IPv4 Header](https://en.wikipedia.org/wiki/Internet_Protocol_version_4)
+* [UDP Datagram structure](https://en.wikipedia.org/wiki/User_Datagram_Protocol#UDP_datagram_structure)
+* [Universal TUN/TAP device driver](https://www.kernel.org/doc/html/latest/networking/tuntap.html)