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Nov 04, 2018 · And the second packet is not guaranteed when the iOS app is running in background. That explains why the background scan result didn’t have the second packet. So, when scanning in background, some data may not be available (e.g. in this case, the device name). Takeaway BLE scan while app is in background (even when screen is locked) is possible.
Bluetooth devices can send advertising packets (PDUs) to broadcast data, or to allow other Bluetooth devices to find them and connect to them. Bluetooth Low Energy uses 40 different RF channels. Three of these channels are called primary advertising channels, and are used for communication outside of connections.
BLE機器は、PeripheralとCentralにより構成されます。一般的なスマートフォンはCentral、一般的なGadgetはPeripheralという位置づけになっていましたが、iOS6以降(*1)からは、iOS自体もPeripheralになれる仕様になりました。 After changing the transmit power of an AP's built-in Bluetooth module, you need to run the broadcasting-content command to reconfigure the RSSI calibration value in BLE broadcast frames. Example # Configure the transmit power of an AP's built-in Bluetooth module to 2 dBm.