One thing noted is that there isn’t channel 27 to 36 appearing. We are more or less familiar with how data are presented in the bytes level. From the packet no. The nRF52 Dongle MAC address is C6:ED:E6:6C:28:CD. Wireshark is a free software tool that captures wireless traffic and reproduces it in a readable format. It provides a near real-time display of Bluetooth packets that are sent between a selected Bluetooth … Do you have any ideas? The period of blinky sending advertising packet is about 1msec. Slave response, and shortly after return to its disconnected state and begin to advertise again. Then next pair are channel 8, 3, 8, 13, 18, 23, 1, 6, 1, 1, 6, 11, 16, 21, 26, 4, 9, 4, 9, 9, 14, 19, 24, 2, 7, 2, 7, 12, 17, 22, 0, 5, 0, 5, 10, 15, 20, 25, etc… (from packet<1194> to packet<1282>). Select Profile_nRF_Sniffer_Bluetooth_LE and click OK. To start sniffing, place the board or dongle that runs the nRF Sniffer for Bluetooth LE firmware between the two devices that are communicating. I can’t capture any ATT packet, only “LE LL” packets are captured. Install the Python requirements:a) Open a command window in the Sniffer_Software/extcap/ folder.b) Type pip3 install -r requirements.txt to install the requirements.c) Close the command window, Copy the contents of the Sniffer_Software/extcap/ folder into this folder. 981 for a range from starting handle: 0x0001 to 0x0009. This data will be verified with the data communication after the module is connected. Go to Capture -> Options, to untick other communication interface that is not relating to the Bluetooth. As of August 2018 We now ship the sniffers with Firmware V2 - this improved firmware from Nordic now has better Wireshark-streaming sniffer software that works with all OSes for live-streamed BLE sniffing Updated the Wireshark dissectors for Wireshark version 2.6. 970. Bug fixes:– Fix unable to decrypt when re-encrypting a connection using LE secure connection LTK if one of the devices isprivacy-enabled and has cycled its resolvable private address. The following sniff data using wireshark can be downloaded from here.You can open this file with Wireshark to go through the connection in details. The advertising channel for the newer Bluetooth BLE protocol can only be at channel 37, 38, 39. Go to the menu select Edit > Configuration Profiles. The slave seems to reply nothing (packet 968) like the previous slave response. After some research, it is found that this Access Address is standardise to 0x8E89BED6. Received Signal Strength IndicatorRSSI: -17dBm (Very Good Signal Strength)RSSI: -35dBm (Good)RSSI: -50dBm (Ok)RSSI: -70dBm (Poor). More than +20 years of experience in embedded system Low Power Connectivity Solution on (Internet of Thing) IOT such as 2.4 Proprietary Radio protocol, DECT, BLE, ANT/ANT+, Zigbee, IEEE802.15.4, Wifi, Thread, NBIOT, LTE-M, etc. Adafruit has a module available with a sniffer … ViewTool Hollong Professional Full channel (37,38,39) data capturing BLE Sniffer and Wireshark software download and installation. nRF Sniffer “nrfsnifferforbluetoothle300129d2b3.zip” from Nordic website. For this purpose create a pipe via: mkfifo /tmp/pipe. The Hop number is found to be 5. This file is a firmware to program the hardware board and turns it into a Bluetooth sniffer tools for sniffing Bluetooth communication. Start nRF-Sniffer by running the ble-sniffer_win executable (for example: ble-sniffer_win_1.0.1_1111_Sniffer… This section shows how to setup a tool for sniffing of Bluetooth protocol and learn about the Bluetooth devices through reverse engineering of the Bluetooth protocol. Average RSSI maintain good at around –35dBm. The data header format has changed. The master continue to probe at packet 985. Download the latest nRF Sniffer “nrfsnifferforbluetoothle300129d2b3.zip” from Nordic website. It is different from the format before the connection.– LLID: L2CAP message– Next Expected Sequence Number: 0– Sequence Number: 0 [OK]– More Data: False– RFU: 0– Length: 0. Go to Help -> About Wireshark. ( Log Out /  – LLID: L2CAP message– Next Expected Sequence Number: 0– Sequence Number: 1 [OK]– More Data: False– RFU: 0– Length: 0. Make sure that the nRF Sniffer files can be run correctly: You can add a profile in Wireshark for displaying the data recorded by the nRF Sniffer for Bluetooth LE in a convenient way. Wireshark … The purpose of the plugins is simply to interpret the raw Bluetooth packets inside the Wireshark app into something a little more readable, and since there are multiple protocols involved with Bluetooth, it helps to make some sense out of … From this packet, I can see two part of data. Followed by response at channel 3 too by the slave. The other is the BLE Link Layer data sent from the peripheral displaying the address, and its peripheral device name. The scan response returns the data type 128-bit Service Class. Change ), You are commenting using your Twitter account. The GATT packets are filtered out from Wireshark. It is also possible to analyze the captured BLE packets in Wireshark. The Adafruit sniffer.py script does a scan and presents the list of devices in range. We recently added several Ubertooth devices to our arsenal which allows us to sniff Bluetooth (in this example, BLE) traffic. ldac技术的功能介绍ldac是索尼研发的一种无线音频编码技术，它最早在2015年的ces消费电子设备大展上亮相。在当时，索尼表示比起标准的蓝牙编码、压缩系统，ldac技术要高效三倍之多。这样一来，那些高解析度的音频文件在进行无线传输的时候就不会被过分压缩，以至于极大损失音质 … Note: Wireshark must be started via the w command to view sniffed packets without manual setup. 989 to 1004 is master probing deeper (Read Request) from the Generic Access service for more detailed information. btle.advertising_address == c0:c9:71:80:51:a0 || btle.scanning_address != 74:41:b0:1d:47:c5nordic_ble.rssi>=-70, https://www.wireshark.org/docs/wsug_html_chunked/ChWorkBuildDisplayFilterSection.html, Copyright © 2006-2019 PIC-CONTROL Pte. It is observed that both the Next Expected Sequence Number and the Sequence Number keep rotating in sequence 00 01 11 10 ….. This blog is to provide the procedure how to install the nRF Sniffer and run on the Window 10. Added new BLE packet information dissector. If you have not install nRF Connect, you can download from this Nordic website. When the firmware finish flashing, you will also notice the button is enabled back. All present and past releases can be found in our download area.. Seems that the master understand the messages from slave and starts to adjust its range. There is a libpcap format defined for Bluetooth frames, and support in libpcap 1.0.0 and later for capturing on Bluetooth devices in Linux; Wireshark… Built-in packet sniffer comes to Windows 10 With the release of the Windows 10 October 2018 Update, Microsoft quietly added a new network diagnostic and packet monitoring program called … Double click on the link next to the name Personal Extcap path. ( Log Out /  Now your board has become a Bluetooth data sniffer. The Bluetooth Low Energy Link Layer packet is always consist of size part. https://www.wireshark.org/docs/dfref/n/nordic_ble.htmlhttps://www.wireshark.org/docs/dfref/b/btle.html, You can select a variable for the filter by right clicking the variable and click on -> Apply as Filter -> Selected (to pick them up) or Not Selected (to hide them), eg. After unzip the package folder, it has multiple sub-folder as below. The nRF software uses nRF52 Dongle as the bluetooth device to scan for Blinky device. For a complete list of system requirements and supported platforms, please consult the User's Guide.. … This is very different from the previous observation which is FF FF FF FF 1F. For this observation, it is always on the lower channels. Could be be that there are data corruption and there is a need from the master to repeat using the channel? There is this profile folder. ViewTool Hollong Full Channel Professional Bluetooth 4.0/4.1/4.2 BLE Sniffer Protocol Analyzer Monitor Support Windows/Linux/Mac Wireshark Dongle 3.9 out of 5 stars 5. To broadcast itself to a Bluetooth Central device for a connection. Shortly after the Blinky gets a request to be connected at packet 962, the GATT discovery starts popping out from packet 967 (time 2.845sec) to packet 1036 (time 3.100sec). Data Length Update procedure and 2Mbit PHY (PCA10040 only, requires Wireshark version 2.4.6 ornewer) since version 2.0.0-beta-3 or later. Browse and select the correct hex file for this PCA10040 board. Installation Notes. It provides a near real-time display of Bluetooth packets that are sent between a selected Bluetooth Low Energy device and the device it is communicating with, even when the link is encrypted. 970, Generic Attribute Service information can be detected at packet no. 37, I can see that Blinkly is transmitting a packet. Key in the following command in the command prompt. One possible explanation that I can imagine could be that the receiver board may not have acknowledge or captured the packet, prompting the sender to do a resend on the same channel or even move backward to the previous channel. The Bluetooth stack is partially implemented and Wireshark can dissect several of the layers and protocols of the stack. It tells us about the information of the packet. Packet no. 3D printer Anaconda Arduino AWS BLE Calibre Colaboratory D1 Mini Docker ESP-IDF ESP-WROOM-02 ESP-WROOM-32 ESP32 ESP8266 Fritzing Git GitHub Inkscape IoT Jupyter notebook M5Stack MH-ET NAS Netatmo nRF52 PlatformIO PlatformIO IDE for VSCode PowerPoint Sensor Shield Sniffer SVG Tinkercad TTS Ubuntu vaex VBA Virtual machine Visual Studio Code WiFi Windows10 Wireshark … 2350 (time: 8.027sec). You can select the … Cheap paper writing service provides high-quality essays for affordable prices. It also shows that the nRF software is sending out scan request to check out the blinky device which was advertising itself frequently. Wireshark has no problem … Information about the Generic Access service block. Nordic provides the free to use Bluetooth LE sniffer and it can run with Nordic Development Board. Please take note of the difference….. Select View -> Interface Toolbars > nRF Sniffer for Bluetooth LE, to enable the sniffer interface menu bar to appear below the file menu in the Wireshark program. There is also an event counter on the sniffer which will increment for each pair of master/s;ave communication. The delta delay between the Master and Slave pair is about 150us gap, 230us packet period. Now going back to look at the Scan Response packet. The delta time (start to start): 802usis the time delay of the start of the previous data packet to the start of the current packet. Those not available is not counted in the hopping. New channel = (curr_channel + hop) mod 37. https://infocenter.nordicsemi.com/topic/ug_sniffer_ble/UG/sniffer_ble/intro.html, https://infocenter.nordicsemi.com/pdf/nRF_Sniffer_BLE_UG_v3.2.pdf. It also contain some script program plugin for Wireshark software to work seamlessly with the nRF sniffer hardware. In this blog, I will use the nRF52840 Dongle as the sniffer and run on the Windows 10 (64 bit). CRC is 0x54490b base on the hex data of 2a 92 do. It is noted that the communication Channel is 9. This is the configuration of how the data display is setup for easy viewing. Then it jump straight into channel 3 fromo Master. Removed features:– Removed support for PCA10000 board.– Removed support for PCA10001 board. More Data could mean if there are more following packets coming which is related to this current packet. All BLE packets detected by the Sniffer are passed to Wireshark and are wrapped in a header which contains useful meta-information not present in the BLE … We will now focus more on the data information instead of the bytes level. All the details of the Sniffer options can be found inside the USER GUIDE of BLE Sniffer document. The attribute data packet 967 and 970 are labelled as ATT L2CAP (Logical link control and adaptation protocol). We will dive into the data packet details later. Analytics cookies. To keep learning simple, we evaluate step by step. The file memory layout display will be refresh with a orange block. This means that the addresses should be tracked by the Wireshark program, probably through the Access Address 0xc8bb66dc, There is only the data header with no data. However, the task is not easy, so to date I have failed to find the magic BLE endpoint that controls everything. Archived Releases TI recommends using the newest release in order to take advantages of all improvements and new features. nrf-ble-sniffer-osx is an OS X program which interfaces with the BTLE sniffer software released by Nordic for use on their development boards and allows you to view and follow BTLE packets and conversations, dump them to a PCAP file or view them decoded in Wireshark. r/netsec: A community for technical news and discussion of information security and closely related topics. Bluefruit LE Snifferを使って、二つのBLEデバイス間のデータをキャプチャーし、WiresharkでBLEプロトコル解析をしました。 動作環境 Windows10 Pro nRF51822搭載 Bluefruit LE Sniffer Wireshark Version 3.0.5 Python 3.8.0 Bluefruit LE Snifferとパソコンとの接続 Bluefruit LE Sniffer … SmartRF Packet Sniffer 2 can also capture and display over-the-air packets using the LAUNCHXL-CC1352P, LAUNCHXL-CC1352R, or LAUNCHXL-CC26X2R1 with the Wireshark dissector. The scan request message from nRF to the Blinky is observed to be about 400ms apart. Within the connection period from packet no. It determines which channel can be used for the communication, and communicated to the slave device during the connection request. Can be used to debug ESB or Gazell protocol? We will study what is inside an advertise packet of this peripheral from Nordic Bluetooth Blinky example. Once you choose the hex file, you will be back onto the main window. https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Sniffer-for-Bluetooth-LE/Download#infotabs. This release adds support for the nRF52840 Dongle. In this case, I use the buttonless DFU firmware and put the device name inside the scan response. sniff data using wireshark can be downloaded from here. We would like to show you a description here but the site won’t allow us. To this end, I purchased an Adafruit Bluetooth LE Sniffer, installed Wireshark on my Raspberry Pi and Nordic Semiconductor nRF Connect on my phone. $119.00. Wireshark is a very popular communication protocol analyzing tools. 962, with the nRF Connect connects to the Blinky. It is noted that it took a total of 28 packets (ATT L2CAP protocol), to complete exposing Blinky’s GATT services to the master device. Field name Description Type Versions; nordic_ble.aux_type: Aux Type: Unsigned integer, 1 byte: 3.4.0 to 3.4.3: nordic_ble.board_id: Board: Unsigned integer, 1 byte This site uses Akismet to reduce spam. Go to the link Personal configuration, and double click on the link to open up the folder. Timing, RSSI, packet counting, data direction, transmitting channel, etc…. Next is channel 20. You will notice that there is a folder named “hex“. The nRF Sniffer for Bluetooth® LE is a useful tool for learning about and debugging Bluetooth Low Energy applications. All rights reserved. PDU is for higher level BLE device discovery and connection process.Type of PDU available– ADV_IND– ADV_DIRECT_IND– ADV_NONCONN_IND– SCAN_REQ– SCAN_RSP– CONNECT_REQ– ADV_SCAN_IND. Next pair is at channel 25. When nRF apps disconnect from the Blinky, the Control Opcode: LL_TERMINATE_IND can be observed. We switch off the Blinky Central module. This the board model of the nRF52 DK board that we are using. In the previous observation, all the channels are active except for the advertising channel 37, 38, 39. These are the GAP profile from what I can see on the Wireshark screen. Download and install Wireshark onto your system. If Wireshark reports corrupted memory or throws an assertion and exists this is a Wireshark issue. Press Ctrl+E or go to menu Capture -> Start to start capturing the Bluetooth packets. After the connection, the source and destination MAC address seems to be no longer appear. Sniffing a connection requires support from the baseband layer which is implemented inside the Bluetooth chipset. Seems more like an acknowledge purpose to the master device. Bluetooth Low Energy（BLE）用のスニッフィングツールデバイスです。二つのBLEデバイス間のデータをキャプチャーし、ネットワーク分析を行うオープンソースソフトウェアであるWiresharkに、データを送信することが可能です。 they're used to gather information about the pages you visit and how many clicks you … We use analytics cookies to understand how you use our websites so we can make them better, e.g. After a few seconds, the connection will be ready, and you will notice that the button on the right column of the application is enabled. Added forwarding of BLE data to TI BLE … Only the starting handle is different thsi time. One at handle 0x0001, the other at handle 0x000a. Select the new “Profile_nRF_Sniffer_Bluetooth_LE” profile. Eg. Let’s looking into the other packet to see if this understanding is true. In Wireshark, select Edit > Configuration Profiles. Which proves the purpose of the channel map. It is the idling time between packet data transmission. Packet 971 packet from master is almost the same as packet 967. Then the master process to Find Information from packet 1007 to 1029. Sniffer can install the Wireshark plugins necessary to decode its packets. 962 (time: 2.829sec), and ends at packet no. In fact, most will compile with the Wireshark development package for your Linux version, for example, wireshark-dev on Ubuntu. It might seem impossible to you that all custom-written essays, research papers, speeches, book reviews, and other custom task completed by our writers are both of high quality and cheap. PACKET-SNIFFER — SmartRF 数据包监听器 2. The files is all inside the folder “extcap” to be copy later into wireshark folder. Next pair is at channel 15. The connection happens at packet no. The Network Forensics Tool. There will be no more advertising from the Blinky. In this observation on the bluetooth pad lock, it was noted that during the CONNECT_REQ, the Channel Map turns out to be FF FF FF 07 00. Before you start setting up the nRF Sniffer, make sure that you have the following prerequisites installed on your computer: Select the windows installer for 64 bit version of wireshark. This connection started at packet no. Change ), You are commenting using your Google account. More than 56 million people use GitHub to discover, fork, and contribute to over 100 million projects. The sniffer can pick up (sniff) every packet between a selected peripheral and the central device it is communicating with, even when the link is encrypted. PDU Type: ADV_IND means Undirected Advertising. The filter features and the packet buffering are different. Created by Espressif Systems, ESP32 is a low-cost, low-power system on a chip (SoC) series with Wi-Fi & dual-mode Bluetooth capabilities! nRF Sniffer for Bluetooth LE The nRF Sniffer for Bluetooth® LE is a useful tool for learning about and debugging Bluetooth Low Energy applications. To add the nRF Sniffer profile in Wireshark, complete the following steps: Go to Help > About Wireshark (on Windows or Linux) or Wireshark > About Wireshark (on macOS). The RF channel for advertising is RF Channel 0, 12, 39. The ESP32 family includes the chips ESP32-D0WDQ6 (and ESP32-D0WD), ESP32-D2WD, ESP32-S0WD, and the system in package (SiP) ESP32-PICO-D4.At its heart, there's a dual-core or single-core Tensilica Xtensa LX6 microprocessor with a … Adafruit Bluefruit LE Sniffer - Bluetooth Low Energy (BLE … To install the nRF Sniffer capture tool, complete the following steps: Install the Python requirements: Open a command window in the Sniffer… GATT communication (ATT L2CAP protocol) start on packet no. Now click on the button that says “Add HEX file”. Nordic has the Video on the BLE Sniffer (old version) that is running on the nRF51 DK board. Handle 0x000b eventually stop at packet 978. One is from the sniffer itself, displaying the channel that it is sniffing, the RSSI (signal strength). The nRF Bluetooth® Smart Sniffer is a tool for debugging Bluetooth low energy (BLE) applications. Bluetooth capture setup You can capture Bluetooth traffic to or from your machine on Linux in Wireshark with libpcap 0.9.6 and later, if the kernel includes the BlueZ Bluetooth stack; starting with the 2.4.6 … However the address is no where to be found in the packet. This current channel 9 could be the result of the channel hopping.Access Address: 0xc8bb66dcThe access address is different from the previous one. Looking at the end of the “Info” column, I see SCAN_RSP. You can get the zip package from the Nordic Web page. Packet 967 from master has a starting handle of 0x0001 to 0xffff, seems to be master asking for services that within these range from the slave. The nRF Sniffer for Bluetooth® LE software is installed as an external capture plugin in Wireshark. It is note that this master has change its read request from “Read By Group Type Request” to “Read By Type Request”. From channel 23 to channel 1, is exactly 5 hops away from the next available channels. Under the Wireshark interpretation, only the bits for Bonding and MITM are set, while the value of 0x0d suggests the Secure Connection bit is also set. If the x permission is missing, add it using chmod +x nrf_sniffer_ble.sh. Access Address: 0x8e89bed6 (the usual fixed preamble data at the beginning of the BLE data packet), PDU Type: Connect_REQ (0x5)Data Length: 34 (address + link layer data), An new Access Address is assigned as 0xc8bb66dcCRC Init: 0x64fb60Window Size: 5 (6.25msec)Window Offset: 0 (0msec)Interval: 6 (7.5msec)Latency: 0Timeout: 400 (4000msec)Channel Map: ff ff ff ff 1f (default RF Ch 0, 12, 39 for advertising)Hop: 9Sleep Clock Accuracy: 0 to 20ppm (7), Hop: 9 means to hop 9 channel away from the current channel. 962 to 2350, the GATT protocol appear. Right click it and click on the “Run as administrator“. The data is from the Peripheral device, advertising to let other bluetooth device aware on its existence. Learn how your comment data is processed. You will the Command Prompt app appear on the menu. Copy the folder “…\Profile_nRF_Sniffer_Bluetooth_LE\” to this into this profile folder. This is noted in the sniffer wireshark that this packet 970 is the response that is requested from packet 967 (GATT Service request 0x2800). This is the long form UUID 00001523-1212-efde-1523-785feabcd123, which identify the service provided by this Bluetooth peripheral. The nRF apps get to connect with Blinky about 135ms after its scan request. The slave is returning 2 groups of attribute data. ( Log Out /  More data can be seen by this slave response. Select the Sniffer Target The nRF-Sniffer can only sniff one device at a time, so the first step is getting the sniffer running and then selecting the device that you want to debug. そこで今回は、 BLE Sniffer を使ってみました。BLE Sniffer を使うと周囲のBLEデバイスの通信状況を確認することができますし、 Wireshark と連携することでさらに詳しくパケットを確認することができます。 今回使ったのは Adafruit の Blueftuit LE Sniffer … https://www.wireshark.org/docs/dfref/n/nordic_ble.html, https://www.wireshark.org/docs/dfref/b/btle.html, Guide to Nordic Bluetooth BLE for Beginner, Blinky Peripheral (examples->ble_peripheral->ble_app_blinky), Blinky Central (examples->ble_central->ble_app_blinky_c). The Packet Sniffer filters and decodes packets and displays them in a convenient way, such as Wireshark for the CC13xx and CC26xx devices. New features:– Added support for nrf52840dongle_nrf52840 (PCA10059) board. It is noted that the Master & Slave Address being keep tracked. This is perhaps master is probing from the slave whether if there are more services from the handle range 0x000b to 0xffff. Following that, a new interface needs to be added to Wireshark … It is other Bluetooth device sending a scan request to Blinky. Inside contains the *.hex file for the nRF Bluetooth board. Packet 970 from slave response with 2 services. Wireshark v2.4.6 or later (v3.0.7 or later recommended on Windows). Thank you for sharing. By using some of the tooling provided with Ubertooth it’s possible to send this network traffic into Wireshark … About 2 scan request message per second. The nRF Sniffer for Bluetooth LE allows near real-time display of Bluetooth LE packets. Hi, Please take a look at the troubleshooting chapter in the nRF Sniffer User Guide v2.2., go through the steps in chapter 6.1 "The nRF sniffer is not listed in the Wireshark interface" If all interfaces are enabled, the data captured will be massive and difficult to find Bluetooth data. The slave response at packet 974 with a handle at 0x000b (which is unknown) with a UUID of 23d1bcea5f782315deef121223150000. This slave packet looks very similar from the master packet. How to install BLE Sniffer on nRF52840 Dongle and run it, How to install BLE Sniffer on nRF52840 Dongle and run it, Step By Step on Nordic Connect SDK for Development, How to use the NRF52840 Dongle (PCA10059) as development board, Current Consumption with FreeRTOS on Nordic nRF5 SDK, Serial UART DFU on nRF5 SDK (by using host tool instead of nRFUtil in C Code application), How to get the RSSI change on the nRF5 SDK, Overview on SPI Master / Slave on nRF52 Series, Linux (check the Wireshark prerequisites for version compatibility). This will open up the folder from your Window explorer. 2.2. wireshark 2.3. ble Sniffer 2.4. nRF Connect 软件请自行查找资料安装; 开始抓包. Enable the nRF Sniffer capture tool in Wireshark: a) Refresh the interfaces in Wireshark … The delta delay between the Slave and Master of the next pair is about 7190us gap, 7270us packet period. Introduction. Once installed, key in the following command to check if the installation is correct and is working. Change ), You are commenting using your Facebook account. It is also observed that for every pair of master/slave packet, the channel hop by 9 ch. In the previous observation, except for the 3x advertising channel, all the channels are available for use. Note that RF channel is the physical radio frequency channel. This is important to give administrator right when you key in the command in the following section. So it means that in this new observation channel 27 to 36 (or RF Channel 29 to 38) may not be available for use. The Access Address (AA) is the same as the previous evaluation that we did. Acrylic Wi-Fi Sniffer. The previous channel during the advertising and connection packet was at Ch 39. We should be able to see all the data as reflected in this nRF Bluetooth app. The slave responded on channel 5. The last 2 packets (packet 1033, 1036) are Read Request from GAP Profile’s Device Name. This is the hex files to turn the various Nordic nRF Bluetooth boards into a sniffer tool. At packet no. The delta time (end to start): 498usis the time delay of the end of the previous data packet to the start of the current packet. Meaning that for every pair of data packet communicated, the next channel will increment by 5, to the next channel. It is the time period of the transmission. Generic Access Service information can be detected at packet no. Base on this difference and some research from online, I would assume that the purpose of this Channel Map is probably to map out the available channel for use. This Channel Map should be determine by the CENTRAL device connecting to the PERIPHERAL device.
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