You can also send messages directly between two nodes in the network without transiting through the gateway. You can attach sensors directly to the gateway as well. Gateway - passes data from nodes to your home automation controller as well as from the home automation controller back to nodes. In most setups you will probably not need any repeater-nodes as the transmitter range for the most basic radio is about meters. A repeater-node can optionally include direct-attached sensors and report their sensor data to the gateway. Repeater-sensor nodes - must stay awake in order to pass messages from its child sensor nodes. These puppies have the option to sleep most of the time if you want to run them on battery. Sensor nodes - continuously read the status of all attached sensors and pass the sensor data through the radio network back to the gateway. If you live in a mansion or very large house, you may need to enable the repeater mode for some sensor nodes R to relay data from sensors that are located far away from the gateway. Normally the sensor nodes S will send their information directly to the gateway GW. Your sensors will form a tree network topology. In this section, you will learn the difference between SensorRepeater-sensor and Gateway.

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