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三者缺一不可，passive的作用：
RTLS Passive
The RTLS passive does not actively participate in the BLE connection between the RTLS master and slave. Instead, it uses the Micro BLE-Stack in connection monitoring mode to follow the connection. To do this, the passive device relies on the Master to distribute the connection parameters once a connection is formed. The passive node does the following:
Implement ToF passive role
Receives packets with CTE and performs in-phase and quadrature component (IQ) sampling
Uses Micro BLE-Stack in Connection Monitoring mode to follow connection between master and slave
