I have done some clear examples for Cactus Rev 2 in my blog here: gideonvos.wordpress.com and also use it extensively with example code here: www.iotlink.net. Feel free to copy and use the examples if it helps you in any way.
Because the code is for Arduino Mega. So just replace
Serial1, it should work with Cactus. I’ll add the example to our wiki.
Thank you very much for your sharing.