https://devzone.nordicsemi.com/f/nordic-q-a/125721/how-to-reduce-zigbee-group-cast-retry-timesI have developed an nRF52840 board that implements the following basic logic: Onboarding Zigbee Devices : Supports Zigbee devices joining the network. Creating Device Groups : Creates groups for devices. Sending Multicast to Group Devices : Sendsen-USTelligent Community 13Thu, 20 Nov 2025 11:48:31 GMThttps://devzone.nordicsemi.com/thread/554886?ContentTypeID=1Thu, 20 Nov 2025 11:48:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cf136d9e-0c86-4d3c-ab62-40c2d01c907aMarte Myrvold<p>Hi,</p> <p>Which SDK are you using, and which version of the SDK?</p> [quote user=""]Problem&nbsp;1: Multiple Broadcasts with the Same Sequence Number[/quote] <p>Which sequence number is this? Is it in the MAC, NWK, or APP layer? For the MAC layer, this should be automatically handled by the nRF 802.15.4 radio, while for the other two, it is handled by the ZBOSS stack.</p> [quote user=""]<strong>Problem&nbsp;2: Why some unicast is sent between multicasts with same sequence Number</strong>[/quote] <p>Please provide a sniffer log as a pcap file.&nbsp;<span style="margin:0;padding:0;text-align:left;">Ensure that the sniffer is started before the coordinator starts the network, so the sniffer has access to the network key. Alternatively, share the network key here so I can decode the packets.</span></p> <p><span style="margin:0;padding:0;text-align:left;">Best regards,<br />Marte</span></p><div style="clear:both;"></div>