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Wireless HART implementation

Hi, 
I wanted to do a poc level testing of Wireless HART,  We were hoping to use our raspberry pi connected serially to a wireless hart mote as a gateway device and another raspberry pi connected serially with another wireless hart mote as the wireless hart field device.
However, so far we have failed to do this, and the indication is that we need to purchase a wireless hart gateway device separately as a product, and only it can initialize the wireless hart network.
Our goal eventually is to make sure that our raspberry pi connected to a wireless hart module can join and communicate effectively with a wireless hart network.

Would invite any advice on the raspberry pi - wireless hart connection, and also if the wireless hart network can be established without having to purchase a gateway device ? 

Thank you.