Using bluetooth for localization is a very well known research field (ref.). The short answer is: you can’t. Signal strength isn’t a good indicator of distance between two connected bluetooth devices, because it is too much subject to environment condition (is there a person between the devices? How is the owner holding his/her device? Is … Read more
Entering a PIN is actually an outdated method of pairing, now called Legacy Pairing. Secure Simple Pairing Mode is available in Bluetooth v2.1 and later, which comprises most modern Bluetooth devices. SSPMode authentication is handled by the Bluetooth protocol stack and thus works without user interaction. Here is how one might go about connecting to … Read more
A little bit of research into Sam’s answer that I thought I’d share You can do so without utilizing private API, but with a few caveats: It will only work on iOS 5.0+ It will only work on devices that support the bluetooth LE spec (iPhone 4S+, 5th Generation iPod+, iPad 3rd Generation+) Simply allocating … Read more
Please remember to close your Input/output streams first, then close the socket. By closing the streams, you kick off the disconnect process. After you close the socket, the connection should be fully broken down. If you close the socket before the streams, you may be bypassing certain shutdown steps, such as the (proper) closing of … Read more
private OutputStream outputStream; private InputStream inStream; private void init() throws IOException { BluetoothAdapter blueAdapter = BluetoothAdapter.getDefaultAdapter(); if (blueAdapter != null) { if (blueAdapter.isEnabled()) { Set<BluetoothDevice> bondedDevices = blueAdapter.getBondedDevices(); if(bondedDevices.size() > 0) { Object[] devices = (Object []) bondedDevices.toArray(); BluetoothDevice device = (BluetoothDevice) devices[position]; ParcelUuid[] uuids = device.getUuids(); BluetoothSocket socket = device.createRfcommSocketToServiceRecord(uuids[0].getUuid()); socket.connect(); outputStream = socket.getOutputStream(); … Read more
I just had the same problem. If you see the source code of BluetoothGatt.java you can see that there is a method called refresh() /** * Clears the internal cache and forces a refresh of the services from the * remote device. * @hide */ public boolean refresh() { if (DBG) Log.d(TAG, “refresh() – device: … Read more
This code works for me. private void pairDevice(BluetoothDevice device) { try { if (D) Log.d(TAG, “Start Pairing…”); waitingForBonding = true; Method m = device.getClass() .getMethod(“createBond”, (Class[]) null); m.invoke(device, (Object[]) null); if (D) Log.d(TAG, “Pairing finished.”); } catch (Exception e) { Log.e(TAG, e.getMessage()); } } private void unpairDevice(BluetoothDevice device) { try { Method m = device.getClass() … Read more
This thread may be long dead but for those who might be trying the same thing, some notes from the AudioManager docs may be useful. It looks like the missing element is the startBluetoothSco() command but there are restrictions on the use of this channel. From the Android Dev site here: public void startBluetoothSco () … Read more
In Terminal, the command : system_profiler SPBluetoothDataType gives you all the details about Bluetooth, including devices paired, with their names, MAC address. Result is unfortunately a bit too much, but with sed or grep command, you should extract what you need.
Starting with Android 4.4 you can print documents from a device to a hardware printer via wifi. Android apps can now print any type of content over Wi-Fi or cloud-hosted services such as Google Cloud Print. In print-enabled apps, users can discover available printers, change paper sizes, choose specific pages to print, and print almost … Read more