Zigbee reconnection speed for multi-channel is slow

[Dunliang]

Hi，

I am using nRF54L15-DK for Zigbee light_stwitch startup testing. After successfully connecting the development board to the Hub for the first time, I evaluated the time from booting up to reconnecting to the Hub by clicking the RESET button.

After adding the following configuration, the time delay from each boot to successful Zigbee reconnection is about 5 seconds (default configuration is about 1 second):

CONFIG_ZIGBEE_CHANNEL_SELECTION_MODE_MULTI=y
CONFIG_ZIGBEE_CHANNEL_MASK=0x3FE0000

Best Regards
Dwenliang Weng

[Kazi Afroza Sultana]

Hello,

Following is the feedback from the team

NLME-NETWORK-DISCOVERY.request::ScanDuration (in C: #define ZB_DEFAULT_SCAN_DURATION), and 
- aBaseSuperframeDuration (for 2.4GHz)

 

According to the NLME-NETWORK-DISCOVERY.request description, it can be calculated (with default ScanDuration=5) that scanning one channel takes 506 ms. If the user sets a mask containing 9 channels, in the worst case, the ED will have to scan the first 8 channels and only connect to the network on the 9th. Therefore, the connection delay will be 8 * 506 ms, compared to the case where the correct channel is known.

 

In summary, according to what we see in the doc, observing a 4-second increase in network-discovery time is expected behavior