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BLE Sniffer - How Do I Sniff NUS, HID, and HRS packets?

MANGO

Environment :

  • Custom Board with MCU NordicSemi nRF51822-QFAA

  • Softdevice S110 7.1

  • IAR for ARM 7.1

  • SDK 7.2 using a merged service (HID keyboard example + NUS example + HRS example)

  • Testing with iPhone 5S, 6 and iPad air (iOS 8.1.3)

/ Nexus 5 and Galaxy Note 3 (Android 4.4.2).

/*********************************************************************************/

Hello, I'm using BLE Sniffer 0.96 provided by Nordic.

This is a magnificent tool.

I wonder this could analyze the packets which are send to the bonded smart phones.

Similary, the Android App Master Control App provides similar function like the picture below.

image description

(The App shows the key values and the UART strings.)

So, does the BLE Sniffer could do something like this?

Or does the Wireshark can filter out the packets I send?

Since I cannot always turn on the Master Control App when I demonstrate,

I hope there is a feature like this.

-Regards, Mango922

/*********************************************************************************/

Added : Nordic_Keyboard example 7.2 sniff.pcapng

Here it is. I used BLE Sniffer 1.0.1 as you told. My laptop is Samsung R440 (Windows 7 SP1 32bit).

My Wireshark version is Wireshark-win32-1.10.11.

This file is the pcapng file when I downloaded the HID Keyboard Example (SDK 7.2) to my

custom board. I connected to my iPhone 5S (iOS 8.1.3).

This sniffed only the pairing process.

I did not sniffed when I pressed the button which sends "hello".

The CONNECT_REQ packet is the 149th packet.

image description

image description

What should be the next step in order to sniff the HID packets?

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  • 0

    I recommend you to use the latest version, 1.0.1. Found here.

    If the devices use Just Works pairing method and the sniffer sniffs the pairing process (to get the encryption keys) it should be able to decrypt the sniffed packets between two bonded devices. Sometimes the sniffer fails to get the encryption keys, then you will just need to try again.

    Edit 24.02: You shouldn't get malformed packets, like in 299. I'm not sure why this happends. Please try a few times, also keep the sniffer close to the devices.

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  • 0

    I recommend you to use the latest version, 1.0.1. Found here.

    If the devices use Just Works pairing method and the sniffer sniffs the pairing process (to get the encryption keys) it should be able to decrypt the sniffed packets between two bonded devices. Sometimes the sniffer fails to get the encryption keys, then you will just need to try again.

    Edit 24.02: You shouldn't get malformed packets, like in 299. I'm not sure why this happends. Please try a few times, also keep the sniffer close to the devices.

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