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Wake up a node wirelessly

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hassan789

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I have an RF UART module device which is sleeping (slave device). I can wake it via a timer and force it connect to any available wireless (master) devices nearby. However, I am wasting slave battery this way. Is there any wireless module that can sleep and I can wake it up wirelessly on demand?

Essentially, I was wondering if anyone can suggest something similar to XBee that can wake up from sleep when the communication is about to start...
 
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