Need help with connecting SmartThings shield and Arduino Ethernet

[vint83]

Hi,
I think you are a bit confused with the purpose of Arduino SmartThings Shield.
Shield is a Zigbee module on top of Arduino that connects to the ST Hub directly vie Zigbee protocol.
If you already have a Shield, you don’t need a Ethernet shield and you can pair it to ST hub using instructions from here:
http://docs.smartthings.com/en/latest/arduino/index.html

If you don’t have a shield and not going to get one, and just want to use Arduino+Ethernet Shield to communicate to ST, that is also possible and described in docs:
http://docs.smartthings.com/en/latest/cloud-and-lan-connected-device-types-developers-guide/building-lan-connected-device-types/index.html

and few times in community. e.g.:

How to make arduino ethernet shield to send POST commands to hub

I’ve been trying to create an Arduino device type that will place the hub into a listen mode for arduino commands. I have several very inexpensive 433 Mhz motion sensors and contact sensors that interface to an arduino. Then the Arduino is sending a command to a Maker channel on IFTTT, and the recipe turns on a simulated light on smartthings. Then I have a smartapp in smartthings that polls the arduino via the ethernet shield when that simulated light is turned on. Obviously this method is heavily dependent on multiple services functioning as intended and will have issues. The round trip time is actually less than 5 seconds normally. However, it would be MUCH easier if I could figure out how to have the arduino simply send the hub commands locally. Can anyone help me get started on the l…

I personally have a Arduino based Garage opener that is working perfectly so far. Code:

(thanks @Charles_Schwer)