Nice board... Simple and straight forward to implement in our own projects!
I also like to have approx. 5 boards... Please tell me how to order and how you like the payment...

Can you also include the RF24's and Arduino boards?

MQTT would indeed be a good solution for this.
Together with Node JS, raspi, mysql, ngnix....

More information I want to share from my personal favorites: http://blog.hekkers.net/2014/02/26/home-automation-with-node-js-mqtt/

Ok ok... I am involved with some IT security on daily basis. Like programming low level, did some logic analyzing, assembly of electronics and certainly will order a couple of these RF modules to integrate them in my upcoming HA project.

So If I have the parts here I will take a look at security and I fitting some simple additional security layer. Or maybe just introduce some intrusion logic. To be continued I will watch this topic regularly...

Okay, I agree... but this discourages me somehow to use this wireless product as a HA solution. Like for example KAKU (klik aan uit) a one way wireless product operating at 433MHz, mainly for dimming and switching appliances and widely used in The Netherlands implemented an easy hashing solution which makes it a little less "funorable" for somebody to control your appliances...

Just thinking in a simple fast solution... for this...

Nice PCB design...

Suggested boards:

• 4 PWM logic FETs (dimming RGB W LED strips, 12V lights) Some FETs are easily capable of doing 8 amps and have almost no excess heat.
• 230V AC triac dimmer module (200w that fits in a EU wall box) EU net frequency.
• 0-10V input module (that fits behind a 0-10V dimmer in a wall box. Round max 60mm, thick approx. 15mm) power from 230VAC line.
• 0-10V output module.
• 1..4 channel opto input 3-250v module.
• 1..2 channel solid state relay module.

Can add nice usable parts, example schema's later... main goal good/better cheap(er) open source products!

I think AES is the way to go...

https://github.com/qistoph/ArduinoAES256

Otherwise here's a list with cycle information:

http://www.das-labor.org/wiki/AVR-Crypto-Lib/en