They're Everywhere.
Wireless Sensor Networks are being offered as products.
Kits of Sensors and Smart Gateways are available off the shelf.
As packaged systems and do it yourself modular pieces.
Monit offers wireless sensors with a 5 year battery life for $50.
Monit also has a 2G Cellular gateway for $119 a 3G gateway for $269 or an Ethernet Gateway for $229.
Shenzhen Minew Technologies Co., Ltd Offers a complete kit for $269 including a gateway and 12 wireless sensors. The system is compatible with MQTT the defacto standard for accessing and aggregating telemetry data.
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