I'm reading an outline of spurious emission test for Bluetooth devices which states that
The Equipment Under Test (EUT), a Bluetooth module is switched to a test nullmode in which it generates the transmitter signal required for the test.
Does that mean all Bluetooth devices from toys to speakers need to implement a separate, specific test mode for the spurious emission test even if they incorporate a certified Bluetooth module? From my understanding, this test mode enables loop back mode which may not be pertinent to the actual normal operation of the device, ie most devices don't utilise loop back mode.
In fact, how is this test mode triggered in the test lab? Must the device itself need to be able to switch to test mode given a certain packet?