difference between BLE stack and Mesh stack

Question

hey 
 I have worked on BLE, and learned the BLE protocol stack. Now i am learning BLE Mesh. I found the Mesh is also having a stack, I could not understand why both the stacks are different even though Mesh uses BLE . Mesh Stack is having different layers like access, model, network, bearer etc. I couldn't understand how data is communicating through these layers, why there is much difference between BLE stack and mesh stack?

awneil · Accepted Answer

This image illustrates the layers of both BLE and BT Mesh "stacks", and shows how the Link and PHY layers are common: 
 
 https://www.digikey.co.uk/en/articles/techzone/2018/mar/designing-bluetooth-low-energy-smart-applications-part-1 
 Note that none of this is specific to Nordic - I suggest some general reading on the topic (possibly also on the nature of "layered" protocol stacks): 
 I found these helpful in defining the terminology & basic architecture of Bluetooth Mesh: 
 http://blog.bluetooth.com/the-fundamental-concepts-of-bluetooth-mesh-networking-part-1 
 https://www.bluetooth.com/bluetooth-technology/topology-options/le-mesh/mesh-tech 
 
 On the "layered" model see, for example: https://en.wikipedia.org/wiki/OSI_model 
 
 The term " stack " comes from the way the layers are built on top of each other - in a stack.

difference between BLE stack and Mesh stack

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