Presumably used to send probe requests for finding UDS networks, instead of parsing [[NWMUDS:RecvBeaconBroadcastData|beacons]]. While official applications do have code for this command, there's no known official applications which actually use it.
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This is about the same as [[NWMUDS:RecvBeaconBroadcastData]] except this only returns already received beacon data, and it can ''only'' be used when connected to a network.