Help please select the type of wireless communication

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Make_Pic

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Help please select the type of wireless communication for industrial applications (preferably name - the manufacturer, URL) to communicate at a distance of not more than 30m, the data rate `100-500 Kbaud. Communication - Point2Point - it is necessary for monitoring up to 256 devices (PLC boards), which does not require a license in most countries, and it is desirable to Low Cost.
Potential candidates WiFi, BlueTooth, Zigbee, NanoNet (sensor net)
What should I choose?
 

I did it using a simple Bluetooth module with Serial port profile from eikon www.eikonsite.it BLUEMORE106 and it works fine
 

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