Mesh

Bluetooth Mesh

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A many-to-many networking protocol built on top of BLE advertising, enabling hundreds of devices to communicate in a mesh topology.

    


    
    
    

      Also known as:
      
      BLE Mesh
      
      BT Mesh
      
    

    
  


  




  
  

    
What Is Bluetooth Mesh?


Bluetooth Mesh is a networking protocol built on top of BLE's advertising bearer and connection-oriented bearer that enables many-to-many communication across hundreds or thousands of nodes. Unlike point-to-point BLE connections, Mesh creates a decentralized network topology where messages can traverse multiple hops to reach distant devices, making it suitable for large-scale IoT deployments such as commercial lighting, building automation, and industrial sensor networks.


Architecture Layers


Bluetooth Mesh adds several layers above the standard BLE stack:






Layer
Function






Model
Application behavior (e.g., Generic OnOff, Light Lightness)




Access
Encryption/decryption, message formatting




Upper Transport
Application-key encryption, segmentation




Lower Transport
Network-key encryption, segmentation/reassembly




Network
Addressing, relay, TTL management




Bearer
Advertising bearer (default) or ATT">GATT Proxy bearer






Message Delivery


The default message delivery mechanism is managed flooding: when a relay node receives a message, it rebroadcasts it on the advertising channels. A Time-to-Live (TTL) counter decrements at each hop, preventing infinite loops. Bluetooth Mesh 1.1 introduced directed forwarding as an alternative that routes messages along discovered paths, reducing unnecessary rebroadcasts.


Addressing


Mesh supports four address types:


    

  • Unicast -- assigned to each node during provisioning, unique within the network (0x0001 -- 0x7FFF).
    • 

  • Group -- pre-defined or admin-assigned multicast addresses (0xC000 -- 0xFEFF). Nodes subscribe to groups to receive relevant messages.
    • 

  • Virtual -- 128-bit UUID-based addresses hashed to a 16-bit value, offering a larger address space.
    • 

  • All-nodes -- broadcast to every node in the network (0xFFFF).
    • 



Security


Bluetooth Mesh uses two layers of AES-128-CCM encryption. The Network Key (NetKey) encrypts at the network layer, authenticating that the sender belongs to the network. The Application Key (AppKey) encrypts at the application layer, ensuring only nodes with the correct AppKey can read the message content. This separation means relay nodes can forward messages without being able to read application payloads.


Provisioning and Management


New devices join the network through provisioning, typically driven by a smartphone app acting as the provisioner. The provisioner assigns unicast addresses, distributes the NetKey, and optionally assigns AppKeys and group subscriptions. The Configuration Server model on each node allows remote management of these settings after provisioning.

  

  

  
  
  




  
  
Related Terms

  

  

    
    Managed Flooding
    
    Provisioning
    
    Provisioner
    
    Relay Node
    
    Friend Node
    
    Low Power Node
    
    Directed Forwarding
    
    Publish-Subscribe
    
    Mesh Model
    
    Matter
    
    Zigbee
    
  





  

  
  

  
  

  
  
  

    
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Frequently Asked Questions


  

    
    

      
      

        
Our glossary covers 90+ BLE technical terms organized by category. Each term includes a definition, related terms, and links to relevant chips and guides.