What is the purpose of 0x21 API frame and How do we use it?

I am working on implementing a wireless sensor network using 6 Zigbees(ZB).I want to setup a mesh network with these zigbees and start routing from a source to destination for which I need to know how to use the Create Source Route frame.

With a total of 6 units, you do not and should not use source routing. Just use the default AdHoc function. Source routing is something that should be used once you get up around 50 nodes.

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