hci

问题 Hi I am going through hci_send_req implementation in hci.c file. in this function after sending hci command to controller . Controller send event packet. After reading event packet in buffer by read(dd, buf, sizeof(buf)) (dd is hci socket descriptor) , now we need event packet header and to get event packet header, buf is sifted by 1 byte. why?? hdr = (void *) (buf + 1); (line number 1049 of hci.c) Please let me know about this. Thanks. 回答1: HCI Event Packets: the Host Controller notifies the

问题 I'm running bluez 5.50 on a Raspberry Pi (both Buster and Stretch). I have a ble sensor device that advertises data only when a button on the sensor device is pressed. So advertisements are asynchronous and there are no periodic advertisements in between (and all packets are unique, no duplicates). I'm having an issue with Bluez though where once a packet is received, Bluez seems to not report any additional packets from the device for the next approximately 11 seconds (very occasionally the

问题 There is a web site page which is coded on asp.net with using c# and ajax is enabled too. I want a very fast loading web page; which is going to happen with the following architecture; 1- First all data is shown by the text boxes (There are 50 text boxes, it is an application form.) 2- When the web Page is requested and loaded, then I want all the photos are shown near the each text boxes 10 by 10 from top of the page till the end of it. (Each photo is between 5 kb - 20 kb; ) I know

问题 I'm building a line-of-business application in Silverlight and need to get the user to edit two .NET TimeSpan values. One is a time of day (relative to midnight) and the other is a duration. Currently I'm using two TextBoxes, formatted as hh:mm. This is pretty straightforward, but it could definitely be improved. I've observed people using the application and while some have no problem quickly entering times, other people struggle. Given that I'm working in Silverlight2, what would you see as

问题 Using BlueZ-5.43, Nordic nRF52832 and Raspberry Pi Raspbian. I can create an l2cap socket and perform service discovery and attribute read and write operations on characteristics. However, this solution by-passes creating a connection via the HCI and subsequently uses defaults for parameters such as supervision timeout and slave latency. Going through hci.c using hci_le_create_conn allows me to override these defaults, but I get a handle number 64 with no obvious means to use this handle for

问题 I am using QN9021 SoC working in controller mode (BLE Bluetooth core specification v4.0). It supports some standard HCI commands as well as some vendor specific commands. I am trying to attach it in my ubuntu laptop. The command that i have used is hciattach . hciattach -s 9600 /dev/ttyUSBx any 9600 noflow nosleep The hcidump shows while executing sudo hciconfig hci1 up . HCI sniffer - Bluetooth packet analyzer ver 5.37 device: hci1 snap_len: 1500 filter: 0xffffffffffffffff > HCI Event:

问题 I am currently trying to write some test scripts to get a bluetooth device fcc certified. I have been following these two sites http://processors.wiki.ti.com/index.php/CC256x_VS_HCI_Commands, http://processors.wiki.ti.com/index.php/WL18xx_Bluedroid_Bluetooth_RF_Testing. I've been using the later to convert commands from the former into tests that the bluedroid test tool will recognize. I have had success for the most part, but I need away to turn on BLE advertising mode and cannot find a way

问题 I am receiving EVT_LE_ADVERTISING_REPORT from a HCI socket. I want to differentiate between a BLE beacon and normal BLE devices (resolving device names etc) I am little confused whether all BLE devices do emit beacons or they are different. If different then how is the packet format for them? 回答1: A BLE beacon frame is just a specialized payload inside a BLE advertisement frame. Devices looking for BLE beacons simply perform a scan for BLE advertisements, look at each one, and see if any of

问题 This question was migrated from Raspberry Pi Stack Exchange because it can be answered on Stack Overflow. Migrated 3 years ago . In order to read the raw RSSI values, we use a utility called Hcidump, which monitors the Bluetooth HCI data. Using hcidump commands, we can read the raw RSSI values when an inquiry response message is received. To obtain RSSI values for every response packet we first set the inquiry mode to Inquiry With RSSI.In order to read raw RSSI values we run the hcidump tool

问题 I need to control an HCI device directly without the Linux drivers/kernel interfering. For example, when creating an LE connection to a peripheral, the driver is independently sending an "LE Connection Update" command which I would like to avoid. I though of two approaches to resolve this: Configure the bluetooth drivers to somehow disable interference with the HCI device (similar to the -r flag on hciattach), then control the HCI device using a regular AF_BLUEOOTH socket. Disable this