bluetooth-lowenergy

问题 I decided to build a tool to display the battery level of a pair of Bluetooth headphones, since I got this feature on Android, but not on Windows. For some reason, it just doesn't display in the settings. I'm using UWP and with the Device Enumerator I managed to pull a list of connected devices. Is there any way to get the battery level from this point? I've seen that people are using RFCom or GATT, but their issue involves connecting to the device, which I think is redundant since the tool

问题 I decided to build a tool to display the battery level of a pair of Bluetooth headphones, since I got this feature on Android, but not on Windows. For some reason, it just doesn't display in the settings. I'm using UWP and with the Device Enumerator I managed to pull a list of connected devices. Is there any way to get the battery level from this point? I've seen that people are using RFCom or GATT, but their issue involves connecting to the device, which I think is redundant since the tool

问题 I decided to build a tool to display the battery level of a pair of Bluetooth headphones, since I got this feature on Android, but not on Windows. For some reason, it just doesn't display in the settings. I'm using UWP and with the Device Enumerator I managed to pull a list of connected devices. Is there any way to get the battery level from this point? I've seen that people are using RFCom or GATT, but their issue involves connecting to the device, which I think is redundant since the tool

问题 I want to read a GATT characteristic value by the way of notification. This means I need to set that characteristic to notify and then read the data. I wish to do this in a function from an onclick. When I run my activity the characteristics are found and added to this arraylist private ArrayList<ArrayList<BluetoothGattCharacteristic>> mGattCharacteristics = new ArrayList<ArrayList<BluetoothGattCharacteristic>>(); I have the UUIDs of the service and characteristic values how do I get a

问题 I am looking to do something similar to this question, based on the answer it suggests that devices are only discoverable if they are emitting packets of information. What I would like to understand is, do devices like mobile phones (iOS/Android) send these discoverable packets by default? Or would they need to be configured (e.g. via an app) to explicitly advertise themselves or some bits of data? 回答1: No, they are not discoverable by default. Vol 3 of the Bluetooth 4.x spec defines two

问题 I am looking to do something similar to this question, based on the answer it suggests that devices are only discoverable if they are emitting packets of information. What I would like to understand is, do devices like mobile phones (iOS/Android) send these discoverable packets by default? Or would they need to be configured (e.g. via an app) to explicitly advertise themselves or some bits of data? 回答1: No, they are not discoverable by default. Vol 3 of the Bluetooth 4.x spec defines two

问题 I have android app. I use BLE(Bluetooth low energy) for connect to devices. It is work good, but I have issue on Android 10. This is my code: Hashtable<String, BluetoothDevice> myHtDevices; .... BluetoothGatt gatt = myHtDevices.get(deviceId).connectGatt(this, false, gattCallback); in onConnectionStateChange I get: //public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState){ status= 133, newStatus =0, I have this issue only Android Q. I tried this method(add param

问题 Is it possible for the Bluetooth dual-mode device to be discoverable by classic bluetooth at the same time as being pairable with BT LE devices? It's ok if the device can not operate with both at the same time, but should I switch the chip between those modes really? I just can not find the answer in the BT 4 Core Specification 回答1: Yes, A dual mode device can be discoverable by classic Bluetooth while being connected to a LE device. The device can also be connected to both classic and LE at

问题 Android BluetoothGatt.class has mClientIf private field. Most of the log messages related to BLE events contain this value. For example: onClientRegistered() - status=0 clientIf=17 What does the mClientIf field represent? What does the integer value of this field tell? 回答1: mClientf is a scannerId from Bluetooth scanner, If you dig through the source of BluetoothGatt and BluetoothLeScanner you can find the following: mBluetoothGatt.unregisterClient(scannerId); method is implemented in

问题 Android BluetoothGatt.class has mClientIf private field. Most of the log messages related to BLE events contain this value. For example: onClientRegistered() - status=0 clientIf=17 What does the mClientIf field represent? What does the integer value of this field tell? 回答1: mClientf is a scannerId from Bluetooth scanner, If you dig through the source of BluetoothGatt and BluetoothLeScanner you can find the following: mBluetoothGatt.unregisterClient(scannerId); method is implemented in