iwevent − Display Wireless Events generated by drivers and setting changes
displays Wireless Events received through the RTNetlink
socket. Each line displays the specific Wireless Event which
describes what has happened on the specified wireless
This command doesn’t take any arguments.
There are two classes of Wireless Events.
The first class is events related to a change of wireless settings on the interface (typically done through iwconfig or a script calling iwconfig). Only settings that could result in a disruption of connectivity are reported. The events currently reported are changing one of the following setting :
All those events will be generated on all wireless interfaces by the kernel wireless subsystem (but only if the driver has been converted to the new driver API).
class of events are events generated by the hardware, when
something happens or a task has been finished. Those events
New Access Point/Cell address
The interface has joined a new Access Point or Ad-Hoc Cell, or lost its association with it. This is the same address that is reported by iwconfig.
Scan request completed
A scanning request has been completed, results of the scan are available (see iwlist).
Tx packet dropped
A packet directed at this address has been dropped because the interface believes this node doesn’t answer anymore (usually maximum of MAC level retry exceeded). This is usually an early indication that the node may have left the cell or gone out of range, but it may be due to fading or excessive contention.
Custom driver event
Event specific to the driver. Please check the driver documentation.
The interface has successfully registered a new wireless client/peer. Will be generated mostly when the interface acts as an Access Point (mode Master).
The registration of the client/peer on this interface has expired. Will be generated mostly when the interface acts as an Access Point (mode Master).
Spy threshold crossed
The signal strength for one of the addresses in the spy list went under the low threshold or went above the high threshold.
Most wireless drivers generate only a subset of those events, not all of them, the exact list depends on the specific hardware/driver combination. Please refer to driver documentation for details on when they are generated, and use iwlist(8) to check what the driver supports.
Jean Tourrilhes − jt [AT] hpl.com