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Questions tagged [l2cap]

Bluetooth Logical link control and adaptation protocol resides in the data link layer.

L2CAP is used within the Bluetooth protocol stack. It passes packets to either the Host Controller Interface (HCI) or on a hostless system, directly to the Link Manager/ACL link. L2CAP provides connection-oriented and connectionless data services to upper layer protocols with protocol multiplexing capability, segmentation and reassembly operation, and group abstractions. L2CAP permits higher level protocols and applications to transmit and receive L2CAP data packets up to 64 kilobytes in length.

L2CAP's functions include:

  • Multiplexing data between different higher layer protocols.
  • Segmentation and reassembly of packets.
  • Providing one-way transmission management of multicast data to a group of other Bluetooth devices.
  • Quality of service (QoS) management for higher layer protocols.
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Getting currently playing song name in AVRCP or Establishing browsing channel in AVRCP

I am trying to create a AVRCP app on Andriod, from which I will be connecting to another device (smart phone). Currently I am able to play, pause songs of other device from my app, but I want to get the song name of the currently playing song. Is…
indrajit
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Using CoreBluetooth CBL2CAPChannel to move data

I have set up some data transfer function, using CoreBluetooth CBL2CAPChannel, in a Swift iOS app. Here is the function for sending data: func sendData(_ outStream: OutputStream) -> Bool { let data = tranferBlock! // tranferBlock holds some…
Michel
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L2CAP IOS + Linux (Bluez)

I'm trying to make a simple L2CAP Socket communication between IOS and a Linux PC. I've been able to: Create an L2CAP connection between two Linux machines (using example code from https://github.com/atwilc3000/sample/tree/master/Bluetooth) Create…
inversus
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l2cap (113, 'No route to host')

I am using following code in rapsberry pi zero with bluetooth l2cap protocol. My client code always give me same error Error : Traceback (most recent call last): File "l2cap-client.py", line 11, in sock.connect((bd_addr, port)) File…
Navneet Garg
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LE L2CAP Connection Oriented Channel - Stack/OS support

One of the features of Bluetooth v4.1 is the ability to exchange BLE data at the L2CAP layer. The L2CAP layer is lower than the GATT layer which will result in higher throughput of data exchange. I was wondering is there any Stack/OS that has…
Youssif Saeed
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L2CAP connection over an HCI socket?

The usual way to access L2CAP is to create an L2CAP socket and simply call connect() on it to connect to the bluetooth device you want to access. This usually works completely fine. However, I'm trying to do this on an ARM device with Linux kernel…
Tim Tisdall
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Set L2CAP streaming mode in BlueZ

I need to create a simple L2CAP connection on BlueZ with the streaming mode enabled. Does anyone know how I can switch modes? At the moment, the connection has re-transmission enabled, and I need to cancel all re-transmissions.
Zaphod
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Create and send a bluetooth command frame in Cocoa

I'm using the IOBluetooth Cocoa framework to communicate with a bluetooth device. So far I have gotten down the whole process of discovering the device and its services, pairing with it, connecting to it and now I want to send some actual commands,…
joshwbrick
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Android Bluetooth l2cap socket bind()

Android version: 2.3.7 Kernel version: 2.6.35-14-CyanogenMod-Arco-Kalim arco@tuxbox #1 Mod version: CyanogenMod-7.1.0.1-click The device has been fully rooted. I have added piece of code in my project which taken from Bluez Utils in hidd.c. The code…
Sam
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iOS Swift Facing issue on data transfer over CBL2CAPChannel

From central i am able to connect with Peripheral device and able to read the GATT data. Once peripheral connected i am opening the L2CAPChannel from central, which established successfully(logs i can see in Hercules Simulator). When i am sending…
Jack Farnandish
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Optimize Bluetooth LE L2CAP throughput between Linux running bluer l2cat and iOS

In transferring a raw stream of data over Bluetooth LE L2CAP between Linux and iOS, I get a throughput of approx. 9 kilobyte payload per sec. I expected to be able to transfer approx. 25 kB/s. How can I investigate and/or optimize on the transfer…
jksoegaard
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Concurrent L2CAP and/or GATT Connections between 2 Devices

I was wondering if anybody here knows whether or not it is possible to have two active connections simultaneously between two devices. Device A would be the central role in one connection and that same device would take on the role of peripheral in…
Aditya
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How do I connect a L2CAP-based Bluetooth Camera Shutter (AB Shutter 3) to Linux and get the key event in Python?

Goal I have a HITSLAM Camera Shutter Bluetooth button (which is a AB Shutter 3 device, a common Bluetooth camera remote control) which I want to connect to my NVIDIA Jetson Nano using Bluetooth, so that I can use the button's input for some…
codeabiswas
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Implementing DTLS handshake for the Bluetooth low energy devices

I am trying to implement a DTLS handshake between two BLE devices. For this, I wanted to use the L2CAP channel of the BLE to communicate with the messages coming from the DTLS. Basically, I want to open a DTLS tunnel with the help of L2CAP from the…
prasanna
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about bluetooth spp retransmission

I am transmitting data from my development board to an Android Phone with Bluetooth SPP，and I am confusing about the SPP data retransmission. According to the Bluetooth spec, packet is retransmitted if the sender receives a response packet with ARQN…
roMoon
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