1. How do you interface with a sensor network? Do you go through a serial connection to read the serial packet format (a,b,c,d)? I see several implementations that put the mqtt client directly on the Arduino, but it seems much cheaper for me to just plug it into a USB port to get a virtual serial port instead of investing in a separate ethernet shield :-)

2. How does an item configurations look like for a switch in openHAB? I'm looking to build a toggle switch which toggles light on or off every time it is activated, and I cannot really understand how to configure the switch to allow this behaviour for an mqtt input.

Feel free to take the second question with me directly since this might not be very interesting to the others in the forum :-)

However, the application should be broker agnostic

Of coarse, but I just wondered how you came to select that broker. I only used mosquito so far.

@Yveaux - RabbitMQ was my choice primarily because of:

• I have other applications using AMQP protocol and Rabbit supports multiple protocols (amqp, mqtt, xmpp etc)
• I previously worked with RabbitMQ so it was less "unkown" among the many brokers.
• I like the possibility of setting up central services as active/active and active/passive nodes. Even though I haven't the actual need for such a high availability solution at home ;)

However, the application should be broker agnostic and support to connect over MQTT no matter which message broker used.

/Patrik

Nice work btw (impressive file structure!)

Patrik, looks great! :thumbsup: