Hi @paopaohepan !
QNI from DW3_QM33_SDK v1.1.1 is working like this.
As iOS only supports unicast sessions what it does is open multiple unicast sessions, when an iPhone is connecting to multiple tags.
There’s no restriction to do the same on the tag side, you’d need to keep BLE advertising after connection and handle the connected devices by its connection id and context (check DW3_QM33_SDK_1.1.1/Libs/niq/Inc/niq.h)
Kind regards!