BLE Advertising PrimerThe 2.4GHz spectrum for Bluetooth extends from 2402MHz to 2480MHz. LE uses 40 1MHz wide channels, numbered 0 to 39. Each is separated by 2MHz. Channels 37, 38, and 39 are used only for sending advertisement packets. The rest are used for data exchange during a connection. We’re interested in what’s happening in these 3 channels, and that’s what we’ll cover here. It's important to note that with th
