bluetooth

问题 Currently modifying the sample code and I am encountering an error when try to establish a connection and then read a characteristic in one activity. I am getting BleAlreadyConnectedException when attempting to read from the device. I am first connecting on onCreate. @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_device); // How to listen for connection state changes bleDevice.observeConnectionStateChanges()

问题 I asked this question a few hours ago, but I still can't solve it. I'm trying to catch the BLE signal, and get the rssi vlue by using "BluetoothLeScanner" to measure the distance between two phone. But, my program detects every BLE_signal except the Bluetooth signal on my phone. The following is what I printed out with Log.e as I ran the program. ''' 2019-12-01 00:21:16.319 22089-22089/com.example.bluetooth E/get_RSSI: name: null, addr: 33:DC:55:32:73:96, rssi: -88, distance: 8

问题 From iOS 13 it should be possibile to register for connection events of BR/EDR Bluetooth (Classic) devices. I have followed the instructions provided in the WWDC keynote, in particular I init my CBCentralManager in this way: func initCentralManager() { if self.centralManager == nil{ self.centralManager = CBCentralManager.init(delegate: self, queue: nil, options:[CBCentralManagerOptionRestoreIdentifierKey:"myCentralManagerIdentifier"]); if #available(iOS 13.0, *) { let matchingOptions =

问题 According to PWA Web Bluetooth documentation, it supports "either a BR/EDR or LE connection". I am trying to test using the following code at the console of the Chrome devtools: navigator.bluetooth.requestDevice({ acceptAllDevices: true, }) .then(device => { // Human-readable name of the device. console.log(device.name); console.log(device.id); // Attempts to connect to remote GATT Server. return device.gatt.connect(); }) .then(server => { /* ... */ }) .catch(error => { console.error(error);

问题 I have been fumbling with getting data from a bluetooth RS232 converter using the python for android jnius library. I had thought that it would be as simple as the PySerial library, but as I am still new to java the implementation is quite different. I created the bluetooth connection quite easily, but as soon as I try to read or write data I get a jnius.jnius.JavaException that No methods matching your arguments, and that the methods available for read are: '()I', '([B)I', '([BII)I' and for

问题 I am trying to learn some bluetooth programming in android I have been able to make a rudimentary program that discovers and connects to a (currently just a single) development board with Bluetooth features built in I want to be able to send commands to the board as well as receive messages from it using RFCOMM I have been told that I will probably not be able to move any further without knowing the UUID for the board as well as the phone While digging around for this, I found out that the

问题 I'm developing a "background task enabled" app that connects to a BLE (bluetooth low energy) device. The user opens the app and connects to the BLE while the app is in the foreground. Once the app goes to the background it will keep communication open with the device (if in range) and be alert of any information received from such device. Now my question is how do I handle or even notice that data is coming from the device? It seems that right now my notifications are queued and are only

问题 I am trying to send audio file via Bluetooth using the sample BluetoothChat code. I have created a class that converts audio into bytes and vise-versa. Here are the modifications I have made in the sample code private void sendMessage(String message) { // Check that we're actually connected before trying anything if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) { Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show(); return; } // Check that there

问题 I am trying to send audio file via Bluetooth using the sample BluetoothChat code. I have created a class that converts audio into bytes and vise-versa. Here are the modifications I have made in the sample code private void sendMessage(String message) { // Check that we're actually connected before trying anything if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) { Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show(); return; } // Check that there

问题 I'm making an android app for a school project, using Android Studio ( Kotlin ). I need to send strings to an Arduino Genuino Uno module, passing by a HC-05 bluetooth module. The Arduino will already be connected (paired) to my android device when the app will be launched. Can someone help me to find a right and easy way to only SEND these datas ? Thanks a lot. 回答1: I finally got the answer, I did that : private fun CheckBt() { Toast.makeText(applicationContext, "It has started", Toast.LENGTH