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Passive scanning process is a task and there is a certain correct way of handling tasks.
Scanning while the Wi-Fi interface is in the associated state (wln.associationstate= 1- PL_WLN_ASSOCIATED) or running its own ad-hoc network (wln.associationstate= 2- PL_WLN_OWN_NETWORK) will temporarily disrupt communications between the device and the "current" access point.
Passive detection of networks is performed on all channels, regardless of the value of the wln.domain property. This is because no radio signal is transmitted during the passive scanning.
Passive scanning won't work with networks that have their SSID (name) hidden. To work with "hidden networks", use wln.activescan method instead.