Hi all.

For what it's worth, my gateway is a WeMos D1 R2 V2. Advantages over an arduino include it having wifi built in (so no shield required), it's low cost, it has a faster processor, and has more memory. I was using a number of them as discreet sensors uploading data to thingspeak, but have now migrated everything over to mysensors, with the data going to my new Vera.

Basically, I really like the little beasties. You can also get the WeMos D1 mini, but I like the fact that standard shields will fit the D1R2. Anyhow, can get it here: http://www.aliexpress.com/store/product/WeMos-D1-WiFi-uno-based-ESP8266-for-arduino-Compatible/1331105_32455782552.html

I also like to get these cases for them: http://www.aliexpress.com/item/Uno-MEGA328P-Case-Enclosure-Transparent-Acrylic-Box-Clear-Cover-Compatible-with-Arduino-UNO-R3-Diy-Free/32497563872.html - just need to snap one of the plastic strips if you need to use the micro usb port to power it.

Cheers

Thanks for the suggestions @mfalkvidd, and @chippey5 - thanks for the update - I had exactly the same issue, and could not work out why I was getting that 'millisWait' error. All good now!