This project implements Panasonic VSX-523 AV receiver infrared remote control over network protocols.

Hardware components:

• TP-Link WR703N router
• ATtiny85 microcontroller
• Vishay 5mm infrared LED
• 2N2222 transistor
• Two 5.6k Ohm resistors
• One 100 Ohm resistor

WR703N is used for WiFi connectivity, multiple network protocols support and I2C bus control. ATtiny85 is used for infrared protocol implementation.

Joris Pragt has a great article on soldering I2C and power wires to WR703N in his blog: http://pragti.ch/kippycam/2012/08/15/Adding-an-I2C-interface-to-the-TL-WR703N/

Here is a backup copy of the photo of soledered wires from that article:

ATtiny85 and LED circuit:

For transmitting volume control commands to the WR703N I am using BetterTouchTool for binding custom hotkeys with "Execute Terminal Command" action like this:

echo '+' | nc -u -w0 192.168.0.13 32000