In BLE, 3 of the 40 channels are used for advertising. If two devices are in the midst of a connection, the continuing communication hops about the other 37 channels with no "wasted" power.
But, let me consider two paired-but-unconnected devices. If I jam just the 3 advertising channels (with overwhelming noise), is it possible for them to connect? If so, at least one device must be broadcasting its ID periodically and I suppose Bluetooth standards could allow that device to sit on any quiet channel it finds and have the other device scan all 37 channels one-by-one.
Anyway (with or without jamming), what is the detailed procedure whereby two paired-but-unconnected devices first find each other?
For some background, I have a low-power application where I want the radio for one device to turn on once per day for the shortest possible time (to send one message and receive one message). I'd like to understand how much time the radio will need to stay on for this if I use Bluetooth standards. It helps me build up to understanding this with the two questions above.