rfcomm

问题 I have a Google Pixel 3a XL on Android 10 that is unable to make a good Bluetooth serial connection to a Bluetooth SPP module using Bluetooth 2.0. However, I can connect to a module with Bluetooth 1.2. I haven't been able to determine if this is related to all of Android 10, or something specific to the Pixel 3 line. I'm trying to get GPS position data from a GPS receiver via Bluetooth. When I try to bring up a connection using createInsecureRfcommSocketToServiceRecord() , the serial

问题 I have a Google Pixel 3a XL on Android 10 that is unable to make a good Bluetooth serial connection to a Bluetooth SPP module using Bluetooth 2.0. However, I can connect to a module with Bluetooth 1.2. I haven't been able to determine if this is related to all of Android 10, or something specific to the Pixel 3 line. I'm trying to get GPS position data from a GPS receiver via Bluetooth. When I try to bring up a connection using createInsecureRfcommSocketToServiceRecord() , the serial

问题 I have successfully connected my arduino uno R3 with bluetooth mate module and am able to send data to my laptop running Ubuntu 12.04 via bluetooth. (using serial port protocol). The data is received on rfcomm0. The following code displays the received data : sudo screen /dev/rfcomm0 Now I am facing problems in reading this data in a java program. I have referred the code from http://playground.arduino.cc/Interfacing/Java. This uses the rxtx library to access the serial port. Here is the code

问题 I have a strange issue with bluetooth socket. If I create socket and later close application, android device freeze with very hight CPU load. Here my sample code: // open socket public ConnectThread(final BluetoothDevice device) { Log.v(ConnectThread.class.getName(), "Try to get a socket"); try { this.socket = device.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB")); } catch (IOException e) { Log.e(ConnectThread.class.getName(), e.getMessage()); } Log

问题 I have two Android devices which I want to connect, using Bluetooth, and transfer data over an RFCOMM channel. I only one one device to receive data, while the other device sends it... Using this code, I am able to connect to the other device and begin listening to an RFCOMM channel: Method m = device.getClass().getMethod("createRfcommSocket", new Class[] { int.class }); socket = (BluetoothSocket) m.invoke(device, 2); socket.connect(); class BasicThread implements Runnable{ public void run()

问题 Im trying to build a bluetooth communication link between my Android App and a Raspberry Pi 3. I try to use pybluez on my Raspberry Pi. My problem is that when I try to run the example-code included with pybluez (see below) i get the following error message: Traceback (most recent call last): File "/usr/share/doc/python-bluez/examples/simple/rfcomm-server.py", line 20, in <module> profiles = [ SERIAL_PORT_PROFILE ], File "/usr/lib/python2.7/dist-packages/bluetooth/bluez.py", line 176, in

问题 I need to send commands through an android phone to a Bluetooth enabled device (CSR8670) I thought about using RFCOMM and I can reach the point of discovering the bluetooth device After discovery I have used BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); device.createBond(); to pair the Bluetooth chip with the android phone Upto the pairing step seems to be working fine, as I can see that the chip is paired to the phone using the phone's builtin bluetooth

问题 Question: Could more than one RFCOMM channels be created per time? Testing method: Create connections from Cellphone(Samsung GALAXY S) to two terminals in the PC. PC has two different bluetooth devices(build-in and USB dongle) and using different COM ports, say COM1 and COM2. Steps: Testing each connection from cellphone to different bluetooth devices in PC using SPP, separately. ----> OK, cellphone could read what PC has sent in terminal using each bluetooth device. This means PC, bluetooth

问题 I am trying to connect two unpaired android devices via Bluetooth for P2P networking purposes. MitM protection is not required. Android has the createInsecureRfcommSocketToServiceRecord and listenUsingInsecureRfcommWithServiceRecord for this (since API level 10), which works perfectly on modern devices. However, on a Galaxy Ace (Android 2.3.3 = API level 10, connecting with a Galaxy Nexus), it creates a pairing dialog. This happens both on incoming and outgoing connections. ( Update :

问题 Yesterday we received OTA Android 2.1 on my wife's HTC Droid - HOORAY!!! I am finally able to load my carputer app on her phone. Well we loaded it, but it doesn't work. Specifically, it connects but sees no I/O!!! I paired, re-paired, and re-paired again, every time its the same problem: connect() says we connected successfully, but any attempt to send or receive data appears to work but no data ever arrives in the input buffer. The device I'm connecting to uses AT commands. ATI should