Chapter 4. API Guides
Preset Chan-
nel
Allow Channel
Switch
Preset Router
BSSID
Allow Router
Switch
Root Node
Present
Permitted
Switches？
N X N X X Channel and
Router
N X Y N X Channel Only
N X Y Y X Channel and
Router
Y Y N X X Channel and
Router
Y N N X N Router Only
Y N N X Y Channel and
Router
Y Y Y N X Channel Only
Y N Y N N N
Y N Y N Y Channel Only
Y Y Y Y X Channel and
Router
Y N Y Y N Router Only
Y N Y Y Y Channel and
Router
4.8.8 Performance
The performance of an ESP-WIFI-MESH network can be evaluated based on multiple metrics such as the following:
Network Building Time: The amount of time taken to build an ESP-WIFI-MESH network from scratch.
Healing Time: The amount of time taken for the network to detect a node break down and carry out appropriate
actions to heal the network (such as generating a new root node or forming new connections).
Per-hop latency: The latency of data transmission over one wireless hop. In other words, the time taken to transmit
a data packet from a parent node to a child node or vice versa.
Network Node Capacity: The total number of nodes the ESP-WIFI-MESH network can simultaneously support.
This number is determined by the maximum number of downstream connections a node can accept and the maximum
number of layers permissible in the network.
The following table lists the common performance figures of an ESP-WIFI-MESH network:
• Network Building Time: < 60 seconds
• Healing time:
– Root node break down: < 10 seconds
– Child node break down: < 5 seconds
• Per-hop latency: 10 to 30 milliseconds
Note: The following test conditions were used to generate the performance figures above.
• Number of test devices: 100
• Maximum Downstream Connections to Accept: 6
• Maximum Permissible Layers: 6
Note: Throughput depends on packet error rate and hop count.
Note: The throughput of root node’s access to the external IP network is directly affected by the number of nodes
in the ESP-WIFI-MESH network and the bandwidth of the router.
Espressif Systems 1326
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