CC2541: Packet Sniffer

Srijan Magapu

Part Number: CC2541
Other Parts Discussed in Thread: CC2540

We are using TI CC2541 BLE module on one of our products. For testing purposes, we also purchased a EZSync CC2540 Evaluation Packet Sniffer. We are using Packet Sniffer V2.18.1 for our test. When I ran the tool, I can see a whole bunch of devices, but I am not sure how to filter one particular device. I have looked online for some help, and one of the ideas they gave was use more than one filter. I tried adding 2 filters, and I don't see the device anymore. Also the advertiser ID keeps changing from time to time.

Any little assistance in taking us to the next step will be of great help.

over 8 years ago

0 Sy Su over 8 years ago

TI__Expert 5390 points

Hi Srijan,

By advertiser ID, do you mean the Advertiser's device address keeps changing?
If you know the device address, you should be able to select the appropriate AdvA filter and place the device address in the field.

For example, my device address is 24:71:89:08:11:01 so the filter I used to filter out all other devices besides my own was AA1=0x247189081101.

-Sy Su

0 Srijan Magapu over 8 years ago in reply to Sy Su

Prodigy 90 points

Hi Sy Su,

I tried using AA1 filter, and when I apply this filter, I don't see any device on the screen. Alternatively I can see the device as ready to pair on apps. Is there something I am doing wrong? Or are there any other steps in implementing the filters?

0 Srijan Magapu over 8 years ago in reply to Srijan Magapu

Prodigy 90 points

I also tried other Adva filters. But no device showed up on the screen, once I click on Apply Filter.

0 Sy Su over 8 years ago in reply to Srijan Magapu

TI__Expert 5390 points

Hi Srijan,

The filters can be a bit tricky to use.
Are you able to see your device under AdvA in any of the packets?
Would you be able to share an attachment of your sniffer packet files and let me know what your device address is?

-Sy Su

0 Srijan Magapu over 8 years ago in reply to Srijan Magapu

Prodigy 90 points

The device address is 94:E3:6D:9C:76:05

0 Srijan Magapu over 8 years ago in reply to Srijan Magapu

Prodigy 90 points

0 Sy Su over 8 years ago in reply to Srijan Magapu

TI__Expert 5390 points

Hi Srijan,

Thank you for providing those screenshots. Your Adv PDU Type is ADV_IND so the ADV_IND AdvA (AA1) filter should work for you.

When setting up the filter, you have to put the address in as hexadecimal.

So in your case, you will want to put in the following:

AA1=0x94E36D9C7605

-Sy Su

0 Srijan Magapu over 8 years ago in reply to Sy Su

Prodigy 90 points

Hi Sy Su,

Please check the second screen I uploaded. I used AA1, and no devices showed up when I applied the filter.

0 Sy Su over 8 years ago in reply to Srijan Magapu

TI__Expert 5390 points

Hi Srijan,

Yes I do see that. But like I stated in the post, you need to put the address in hexadecimal.
In other words you forgot to put "0x" before your device address.

-Sy Su

0 Srijan Magapu over 8 years ago in reply to Sy Su

Prodigy 90 points

Thank you Sy Su. I missed that

0 Srijan Magapu over 8 years ago in reply to Srijan Magapu

Prodigy 90 points

Hi Sy Su,

Now that I can see the packets, I tried to pair with the app on smartphone, and once paired, I don't see any packets. How can I sniff, the packets that are happening as the BLE is communicating with smart phone?

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CC2541: Packet Sniffer