cannot talk to dongle after connect

[JimmyD]

I connect to the nRF52840-MDK dongle thru the Serial Terminal (nRF52 Connectivity) it found the comm port and set the baudrate automatically. However, the terminal window constantly fills up the screen with ~/ characters. it repeats every 1 second. What I would like is detailed instructions on how to configure this dongle to be a BT 5 sniffer and read the Extended Advertising for any BT device near the dongle. It would also be helpful to filter the devices seen. Eventually I like to use Python to filter the choices and obtain the advertises data where I can parse the data received. I'm using Windows 10 pro.

Thanks.

[ovrebekk]

Hi James

The nRF Sniffer is documented here. In particular you can refer to the chapter caller nRF Sniffer Usage.

The dongle needs to be programmed with the hex file included in the sniffer download, most likely it has the wrong firmware. This will be described in the documentation I linked to above. 

The sniffer does provide a Python interface, and you can find it documented in the Sniffer API Guide document included in the doc folder of the sniffer download. 

Best regards
Torbjørn

[JimmyD]

Torbjørn,

            The instruction for installation is very hard to follow and leads to a dead end.

First your link takes me to nRF Sniffer usage. The index on the side “Installing the nRF Sniffer starts off as if it is already installed. Very confusing!!

Another is the SnifferAPI.

I cannot find it anywhere.

Since I took too long to try and get this working, I have other priorities, But will circle back to try and get this to work.

Due to my time allocation for this project is short.

Please give me some dummy proof steps to get this working.

 

 

I see a bunch of python code under the nrf_sniffer_for_bluetooth_le_4.1.1 directory I downloaded, but I don’t know which one I need for my application.

 

Greatly appreciate it.

 

James DeLorenzo

[JimmyD]

Thanks for the response. Yes, I have a smart phone that shows the extended advertising along with all the data it is advertising. The closest I got was with Wireshark and there is an Extended advertising section but none of the data matched the phone's.. I will look at the code mod you sent and experiment. Thanks.

[JimmyD]

I was experimenting with your code modification. I'm trying to figure out how to print out the packets that are Extended advertising only along with the data. Can you help?

[JimmyD]

When you said you flashed an nRF52DK with the periodic_adv sample from the nRF Connect SDK.

Is that the same as the nrf_sniffer_for_bluetooth_le_v4.1.1.uf2 file?

If not can you point me to where it is exactly? because the website is very hard to follow.

[ovrebekk]

Hi Jim

You can find the installation instructions for the nRF Connect SDK here.

Most of our customers use this SDK to develop their code for our chipsets, but if I understand you correctly you are not planning any projects with one of the nRF devices? 

You are just using our dongles in order to use the sniffer?

JimmyD said:

I'm trying to figure out how to print out the packets that are Extended advertising only along with the data. Can you help?

I will set aside some time later today to look into this. If you have any progress before that please let me know, so we don't end up doing double work

Best regards
Torbjørn

[ovrebekk]

Hi again

I played around with this some more, and realized that not all the packets sent by the periodic_adv board was received. It seems my earlier advice about setting findAux=True was necessary after all. 

Fixing this I updated the script to print out all the data, available in the packetList field of the packet. I also print out the name and the flags, and filter on the RSSI and the advertising type to ensure I only print packets for an extended advertiser in close proximity. 

Please find my modified script here:

Fullscreen example_count_by_type_v2.py Download

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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import time
from SnifferAPI import Sniffer, UART

nPackets = 0
nPacketsByType = [0,0,0,0,0,0,0,0]
mySniffer = None

def setup():
    global mySniffer
    
    # Find connected sniffers
    ports = UART.find_sniffer()
    
    if len(ports) > 0:
        # Initialize the sniffer on the first COM port found with baudrate 1000000.
        # If you are using an old firmware version <= 2.0.0, simply remove the baudrate parameter here.
        mySniffer = Sniffer.Sniffer(portnum=ports[0], baudrate=1000000)
    
    else:
        print("No sniffers found!")
        return
    
    # Start the sniffer module. This call is mandatory.
    mySniffer.start()
    # Scan for new advertisers
    mySniffer.scan(findAux=True)

    # Wait to allow the sniffer to discover device mySniffer.
    #time.sleep(5)
    # Retrieve list of discovered devicemySniffer.
    #d = mySniffer.getDevices()
    # Find device with name "Example".
    #dev = d.find('Example')
    
    #if dev is not None:
        # Follow (sniff) device "Example". This call sends a REQ_FOLLOW command over UART.
    #    mySniffer.follow(dev)
    #else:
    #    print("Could not find device")

def loop():
    # Enter main loop
    nLoops = 0
    while True:
        time.sleep(0.1)
        # Get (pop) unprocessed BLE packets.
        packets = mySniffer.getPackets()
        
        processPackets(packets) # function defined below
        
        nLoops += 1
        
        # print diagnostics every so often
        if nLoops % 20 == 0:
            #print(mySniffer.getDevices())
            print("inConnection", mySniffer.inConnection)
            print("currentConnectRequest", mySniffer.currentConnectRequest)
            print("packetsInLastConnection", mySniffer.packetsInLastConnection)
            print("nPackets", nPackets)
            print("packet by type", nPacketsByType)
            print()
        
# Takes list of packets
def processPackets(packets):
    for packet in packets:
        # packet is of type Packet
        # packet.blePacket is of type BlePacket
        global nPackets
        if packet.OK:
            # Counts number of packets which are not malformed.
            nPackets += 1
            nPacketsByType[packet.blePacket.advType] += 1
            #if packet.blePacket.advType == 7:
            if packet.RSSI > -30 and packet.blePacket.advType == 7:
                print(packet.flags, " ", packet.blePacket.name, "-", packet.getList())

setup()
if mySniffer is not None:
    loop()

The output when the advertiser is close should be something like this:

1   "" - [32, 0, 3, 76, 166, 2, 10, 1, 37, 21, 0, 0, 91, 129, 195, 208, 214, 190, 137, 142, 71, 13, 12, 25, 157, 155, 66, 48, 47, 61, 117, 10, 73, 37, 32, 138, 61, 24]
1   "" - [32, 0, 3, 77, 166, 2, 10, 1, 38, 22, 0, 0, 147, 130, 195, 208, 214, 190, 137, 142, 71, 13, 12, 25, 157, 155, 66, 48, 47, 61, 117, 10, 73, 27, 32, 66, 120, 194]
1   "" - [32, 0, 3, 78, 166, 2, 10, 1, 39, 22, 0, 0, 203, 131, 195, 208, 214, 190, 137, 142, 71, 13, 12, 25, 157, 155, 66, 48, 47, 61, 117, 10, 73, 17, 32, 141, 22, 24]
17   "Test Periodic Advertising" - [68, 0, 3, 79, 166, 2, 10, 17, 9, 22, 0, 0, 206, 133, 195, 208, 214, 190, 137, 142, 7, 49, 21, 40, 117, 10, 113, 13, 192, 3, 255, 255, 255, 255, 191, 7, 101, 9, 38, 147, 65, 240, 14, 7, 26, 9, 84, 101, 115, 116, 32, 80, 101, 114, 105, 111, 100, 105, 99, 32, 65, 100, 118, 101, 114, 116, 105, 115, 105, 110, 103, 112, 184, 51]
1   "" - [32, 0, 3, 110, 166, 2, 10, 1, 37, 21, 0, 0, 223, 46, 197, 208, 214, 190, 137, 142, 71, 13, 12, 25, 157, 155, 66, 48, 47, 61, 117, 10, 64, 37, 32, 86, 175, 0]
1   "" - [32, 0, 3, 111, 166, 2, 10, 1, 38, 22, 0, 0, 23, 48, 197, 208, 214, 190, 137, 142, 71, 13, 12, 25, 157, 155, 66, 48, 47, 61, 117, 10, 64, 27, 32, 158, 234, 218]
1   "" - [32, 0, 3, 112, 166, 2, 10, 1, 39, 23, 0, 0, 79, 49, 197, 208, 214, 190, 137, 142, 71, 13, 12, 25, 157, 155, 66, 48, 47, 61, 117, 10, 64, 17, 32, 81, 132, 0]
17   "Test Periodic Advertising" - [68, 0, 3, 113, 166, 2, 10, 17, 0, 22, 0, 0, 82, 51, 197, 208, 214, 190, 137, 142, 7, 49, 21, 40, 117, 10, 137, 47, 192, 3, 255, 255, 255, 255, 191, 7, 101, 9, 38, 147, 65, 240, 15, 7, 26, 9, 84, 101, 115, 116, 32, 80, 101, 114, 105, 111, 100, 105, 99, 32, 65, 100, 118, 101, 114, 116, 105, 115, 105, 110, 103, 94, 111, 136]
1   "" - [32, 0, 3, 140, 166, 2, 10, 1, 39, 22, 0, 0, 18, 200, 198, 208, 214, 190, 137, 142, 71, 13, 12, 25, 157, 155, 66, 48, 47, 61, 117, 10, 83, 17, 32, 184, 113, 192]
17   "Test Periodic Advertising" - [68, 0, 3, 141, 166, 2, 10, 17, 19, 23, 0, 0, 21, 202, 198, 208, 214, 190, 137, 142, 7, 49, 21, 40, 117, 10, 46, 46, 192, 3, 255, 255, 255, 255, 191, 7, 101, 9, 38, 147, 65, 240, 15, 7, 26, 9, 84, 101, 115, 116, 32, 80, 101, 114, 105, 111, 100, 105, 99, 32, 65, 100, 118, 101, 114, 116, 105, 115, 105, 110, 103, 136, 25, 63]
1   "" - [32, 0, 3, 169, 166, 2, 10, 1, 37, 21, 0, 0, 135, 114, 200, 208, 214, 190, 137, 142, 71, 13, 12, 25, 157, 155, 66, 48, 47, 61, 117, 10, 73, 37, 32, 138, 61, 24]
1   "" - [32, 0, 3, 170, 166, 2, 10, 1, 38, 22, 0, 0, 191, 115, 200, 208, 214, 190, 137, 142, 71, 13, 12, 25, 157, 155, 66, 48, 47, 61, 117, 10, 73, 27, 32, 66, 120, 194]
1   "" - [32, 0, 3, 171, 166, 2, 10, 1, 39, 22, 0, 0, 247, 116, 200, 208, 214, 190, 137, 142, 71, 13, 12, 25, 157, 155, 66, 48, 47, 61, 117, 10, 73, 17, 32, 141, 22, 24]
17   "Test Periodic Advertising" - [68, 0, 3, 172, 166, 2, 10, 17, 9, 22, 0, 0, 250, 118, 200, 208, 214, 190, 137, 142, 7, 49, 21, 40, 117, 10, 192, 44, 192, 3, 255, 255, 255, 255, 191, 7, 101, 9, 38, 147, 65, 240, 15, 7, 26, 9, 84, 101, 115, 116, 32, 80, 101, 114, 105, 111, 100, 105, 99, 32, 65, 100, 118, 101, 114, 116, 105, 115, 105, 110, 103, 9, 156, 219]

Best regards
Torbjørn

[JimmyD]

my output is not the same. the loaded FW is nrf_sniffer_for_bluetooth_lev4.1.1.ut2. if this is incorrect please let me know specific what I should load.

my output is...

I ran your example_count_by_type_v2.py unmodified and got above. I never saw the characters "Test Periodic Advertising"

[ovrebekk]

Hi 

Clearly packets are received with type 7, as seen by the last value growing larger and larger, but possibly the RSSI limit of -30 is to strict in your setup. 

Could you try to change this to something lower, like -50, or just remove the RSSI check altogether? 

Alternatively try to put both kits very close together, to get a stronger signal. 

Best regards
Torbjørn

[JimmyD]

I changed the value

from -30 to -50 and got this. What does this data mean? is the MAC address hidden in this output?

[JimmyD]

I managed to get the mac address with packet.blePacket.advAddress.

However, the getList values don't match what I should be getting. Is there a command to get the extended advertising data?

[ovrebekk]

Hi Jim

To understand what the raw data means please use the Wireshark interface for reference. Here you can click on every part of the byte sequence and see exactly what it is. The first part is sniffer specific information, and the actual advertising data is located towards the end:

Just keep in mind that the raw values are output as hex in Wireshark, and as decimal in Python. 

What data is it you're missing? 

Best regards
Torbjørn