For temperature and humidity a good solution is a Modbus sensor connected via RS485 to the Smart Hub which permits long cables. Unfortunately these are usually quite expensive. The sensor from our demo plant is a low cost chinese sensor which is discussed in this forum thread.
But if you can wait, we will have our own Modbus temperature and humidity sensor based on the Sensirion SHT21. It will be available at a very reasonable price in about 1 month. We are currently testing these prototypes.
