bluetooth-gatt

I'm using the following method from BLE scanner API on Android 8+ to scan for BLE Beacons startScan(List<ScanFilter> filters, ScanSettings settings, PendingIntent callbackIntent) The problem is that after sometimes I can see Scan Logs but nothing is delivered by the callbackIntent any idea why is this happening? This is the expected behavior on Android 8+. if you need to scan continuously a periodic mechanism is needed in this case. For more information about scanning on different Android versions and different ways. Have a look here 来源： https://stackoverflow.com/questions/52777982/scanning

I am exploring building apps (Android & iOS) for Car OBD2 Adapters that support BLE (Bluetooth Low Energy). In order for the app to be able to work with such adapters from different vendors, I presume there would be a standard set of GATT profile i.e. Services and Characteristics that these adapters would be using for standard features like engine RPM, Fuel level etc. Is this info available somewhere that I can refer while building the mobile app? OBD2 BLE adapters don't use any fixed GATT profiles. The way most (if not all) BLE OBD2 adapters work, is that they offer one service with one or

I'm new in Android BLE so my question may be uncorrect or naive in some way. If this is the case please explain me where I'm wrong and kindly show me the correct way to manage this scenario. Scenario is the following: my Android app communicates with a BLE device sending commands and getting answers from device using BLE characteristics. Sequence is: Device wakes up the app (the onConnectionStateChange method is called) My app writes a command in a characteristic (I call writeCharacteristic putting the command in value parameter). Device sends back the answer to command to my app (the