Chapter 4. API Guides
Fig. 14: Self Healing From Root Node Failure
Intermediate Parent Node Failure
If an intermediate parent node breaks down, the disconnected child nodes will initially attempt to reconnect with the
parent node. After multiple failed attempts to reconnect, each child node will begin to scan for potential parent nodes
(see Beacon Frames & RSSI Thresholding).
If other potential parent nodes are available, each child node will individually select a new preferred parent node (see
Preferred Parent Node) and form an upstream connection with it. If there are no other potential parent nodes for a
particular child node, it will remain idle indefinitely.
The following diagram illustrates an example of self healing from an Intermediate Parent Node break down.
Fig. 15: Self Healing From Intermediate Parent Node Failure
1. The following branch of the network consists of nodes A to G.
2. Node C breaks down. Nodes F/G detect the break down and attempt to reconnect with node C. After multiple
failed attempts to reconnect, nodes F/G begin to select a new preferred parent node.
3. Node G is out of range from any other parent node hence remains idle for the time being. Node F is in range of
nodes B/E, however node B is selected as it is the shallower node. Node F becomes an intermediate parent node after
connecting with Node B thus node G can connect with node F. The network is healed, however the network routing
as been affected and an extra layer has been added.
Note: If a child node has a designated parent node that breaks down, the child node will make no attempt to connect
with a new parent node. The child node will remain idle indefinitely.
Espressif Systems 1319
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