4 Farbe Smart Tag Drahtlose Bluetooth 4,0 Verfolger Tasche Brieftasche pet Key Finder GPS Locator itag anti-verlorene warnung erinnerung

How To Use The iTAG Bluetooth Tracker
How to use iTag >> app iTracing2 is needed >> very limited utility
iTag Smart Anti-Lost Alarm Bluetooth Remote Shutter GPS Tracker for Kids, Keys & Pets (Green) (Misc.)
No keyring actions available


  • Shen Zhen Shi Xin Zhong Xin Technology Co., Ltd
  • F-6888
  • BK3254

The Bluetooth module F-6888 manual

Logitech C270 Webcam into Microscope

DIY USB soldering microscope
Logitech C310 webcam to Microscope

[   34.330798] usb 1-1.3: new high-speed USB device number 3 using ehci-pci
[   34.655552] usb 1-1.3: New USB device found, idVendor=046d, idProduct=0825
[   34.655554] usb 1-1.3: New USB device strings: Mfr=0, Product=0, SerialNumber=2
[   34.655555] usb 1-1.3: SerialNumber: 2AA824A0
[   34.664496] media: Linux media interface: v0.10
[   34.669297] Linux video capture interface: v2.00
[   36.085492] usb 1-1.3: set resolution quirk: cval->res = 384
[   36.085792] usbcore: registered new interface driver snd-usb-audio
[   36.085958] uvcvideo: Found UVC 1.00 device <unnamed> (046d:0825)
[   36.100617] uvcvideo 1-1.3:1.0: Entity type for entity Extension 4 was not initialized!
[   36.100619] uvcvideo 1-1.3:1.0: Entity type for entity Extension 6 was not initialized!
[   36.100620] uvcvideo 1-1.3:1.0: Entity type for entity Extension 7 was not initialized!
[   36.100621] uvcvideo 1-1.3:1.0: Entity type for entity Processing 2 was not initialized!
[   36.100622] uvcvideo 1-1.3:1.0: Entity type for entity Extension 3 was not initialized!
[   36.100623] uvcvideo 1-1.3:1.0: Entity type for entity Camera 1 was not initialized!
[   36.100754] input: UVC Camera (046d:0825) as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/1-1.3:1.0/input/input12
[   36.100883] usbcore: registered new interface driver uvcvideo
[   36.100884] USB Video Class driver (1.1.1)

HP Color LaserJet Enterprise M551dn

  • I timed the M553dn on our business applications suite, at 12.2 pages per minute (ppm)
  • It beat the HP M551dn, our Editors’ Choice medium- to heavy-duty color laser printer for small to midsize offices, which is rated at 33ppm and which tested at 9ppm.
  • The Dell C3760dn Color Laser Printer, rated at just 23ppm, tested at 7.9ppm.

HP Color LaserJet Enterprise M750dn Drucker

The Best Printers of 2017
The Best Laser Printers of 2017
The Best Inkjet Printers of 2017

Windows 10 Creators Update


Bash on Ubuntu on Windows
Learn About Bash on Windows Subsystem For Linux
Windows 10 Creators Update: What’s new in Bash/WSL & Windows Console


Linux on Windows 10: Will penguin treats in Creators Update be enough to lure you?
Windows 10: Windows Subsystem nach Creators Update aktualisieren


FYI you can run GUI Linux apps from bash

X Server

VcXsrv Windows X Server
Xming X Server for Windows


An Introduction to Bluetooth Programming, TCP/IP vs. Bluetooth

11 Internet of Things (IoT) Protocols You Need to Know About

  • HCI = Host Controller Interface (Host [uC] <==> Controller [BT])
  • VHCI = Virtual HCI
  • H4 = UART protocol support
  • BTE = Bluetooth Embedded System
  • BTA = Bluetooth Application Layer
  • Single Mode / Dual Mode: BR/EDR vs. LE
  • Basic Rate (BR)
  • Low Energy (LE)
  • Enhanced Data Rate (EDR)
  • Media Access Control (MAC)
  • Physical (PHY)
  • Alternate MAC/PHY (AMP)
  • PAL (Protocol Adaptation Layer)
  • link manager protocol (LMP)
  • link layer protocol (LL)
  • LE asynchronous connection logical transport (LE ACL)
  • Protocol Adaptation Layer (PAL)
  • Security Manager (SM)
  • Attribute Protocol (ATT)
  • Generic Attribute Profile (GATT)
  • Generic Access Profile (GAP)
  • basic acknowledgement/repeat request (ARQ)
  • Security Manager Protocol (SMP)
  • Asynchronous Connection-Oriented (ACL)
  • Synchronous Connection-Oriented (SCO)
  • Extended SCO (eSCO)
  • Active Slave Broadcast (ASB)
  • LE Advertising Broadcast (ADVB)
  • a

Layer Protocol Architecture

  • Generic Access Profile (GAP)
  • Service Discovery Protocol (SDP)
  • L2CAP
  • Link Manager / Link Layer
  • Baseband / Link Controller / PHY


  • Personal Area Networking (PAN)
  • LAN Access Point (LAP)
  • Dial-Up Networking (DUN)
  • Serial Port Profile (SPP)


Bluetooth (de)
Bluetooth (en)
Bluetooth-Profile (de)
List of Bluetooth profiles (en)
Bluetooth stack (en)
Bluetooth Low Energy, BLE, LE (de)
Bluetooth Low Energy, BLE, LE (en)
mbed: Bluetooth Low Energy
android: Bluetooth Low Energy
Near Field Communication (NFC) (de)


  • BlueZ (Linux)
  • BlueDroid (Android)
  • lwBT


Adafruit BLE / Bluetooth Smart

Develop with Bluetooth – Developer Tools & Resources
Develop with Bluetooth – Blog
Develop with Bluetooth – Training Videos
Bluetooth Core Specification


Bluetooth low energy Advertising, a beginner’s tutorial
Bluetooth low energy Services, a beginner’s tutorial
Bluetooth low energy Characteristics, a beginner’s tutoria

How to distinguish between random and public GAP addresses?


GATT Specifications (Profi​le ​​Specification​)
GATT Services


Bluetooth LE APIs
BLUFI API (latest)
Example routing UART to VHCI directly
Implement Bluetooth BLE — RFC on API


BTstack Manual v1.0
BTstack Source
BTstack Port for the Espressif ESP32 Platform


Android Bluetooth Stack
Bluedroid stack in android
Android-Adding Bluetooth Profile (old!!)


Direct Control of HCI Device (Bypass Bluetooth Drivers) on Linux
node-bluetooth-hci-socket, Bluetooth HCI socket binding for Node.js
Bluetooth: Using USB bluetooth adapters


Structural unknown HCI Command in Bluetooth LE logs

$ hcitool scan
$ sdptool search OPUSH 00:25:48:FC:98:6D
$ obexftp --nopath --noconn --uuid none --bluetooth 00:25:48:FC:98:6D --channel 6 -p tuxcase.jpg 
[   20.560100] Bluetooth: Core ver 2.21
[   20.560118] Bluetooth: HCI device and connection manager initialized
[   20.560121] Bluetooth: HCI socket layer initialized
[   20.560124] Bluetooth: L2CAP socket layer initialized
[   20.560132] Bluetooth: SCO socket layer initialized
[   20.579146] Bluetooth: HCI UART driver ver 2.3
[   20.579148] Bluetooth: HCI UART protocol H4 registered
[   20.579149] Bluetooth: HCI UART protocol BCSP registered
[   20.579150] Bluetooth: HCI UART protocol LL registered
[   20.579151] Bluetooth: HCI UART protocol ATH3K registered
[   20.579151] Bluetooth: HCI UART protocol Three-wire (H5) registered
[   20.579183] Bluetooth: HCI UART protocol Intel registered
[   20.579200] Bluetooth: HCI UART protocol BCM registered
[   20.579201] Bluetooth: HCI UART protocol QCA registered
[   20.579202] Bluetooth: HCI UART protocol AG6XX registered
[   20.601412] Bluetooth: hci0: Firmware revision 0.1 build 103 week 50 2016
[   21.097388] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   21.097390] Bluetooth: BNEP filters: protocol multicast
[   21.097393] Bluetooth: BNEP socket layer initialized
[   36.597632] Bluetooth: RFCOMM TTY layer initialized
[   36.597638] Bluetooth: RFCOMM socket layer initialized
[   36.597643] Bluetooth: RFCOMM ver 1.11
[ 8399.532221] Bluetooth: hci0: Bootloader revision 0.0 build 26 week 38 2015
[ 8399.539943] Bluetooth: hci0: Device revision is 16
[ 8399.539945] Bluetooth: hci0: Secure boot is enabled
[ 8399.539945] Bluetooth: hci0: OTP lock is enabled
[ 8399.539946] Bluetooth: hci0: API lock is enabled
[ 8399.539946] Bluetooth: hci0: Debug lock is disabled
[ 8399.539947] Bluetooth: hci0: Minimum firmware build 1 week 10 2014
[ 8399.542654] Bluetooth: hci0: Found device firmware: intel/ibt-12-16.sfi
[ 8400.960872] Bluetooth: hci0: Waiting for firmware download to complete
[ 8400.961274] Bluetooth: hci0: Firmware loaded in 1398407 usecs
[ 8400.961342] Bluetooth: hci0: Waiting for device to boot
[ 8400.977322] Bluetooth: hci0: Device booted in 15614 usecs
[ 8400.977601] Bluetooth: hci0: Found Intel DDC parameters: intel/ibt-12-16.ddc
[ 8400.979328] Bluetooth: hci0: Applying Intel DDC parameters completed


Task/Thread Analysis and Visualization

FreeRTOS Support

OpenOCD has explicit support for the ESP-IDF FreeRTOS; FreeRTOS detection can be disabled in esp32.conf. When enabled, gdb can see FreeRTOS tasks as threads. Viewing them all can be done using the gdb i threads command; changing to a certain task is done with thread x, with x being the number of the thread. All threads can be switched to except for a thread actually running on the other CPU; please see the following section ESP32 Quirks for more information

Adding FreeRTOS Thread Awareness to GDB and Eclipse
FreeRTOS Thread Debugging with Eclipse and OpenOCD
FreeRTOS ARM Thread Debugging with Eclipse and GDB
Segger SystemView: Realtime Analysis and Visualization for FreeRTOS



API Reference

Task Creation


RTOS Kernel Control

Kernel Control

Queue Management


Event Groups