Scan response packet sent by beacon without any scan request

[Jusang Kim]

reco_scan_req.PNG

Now i am doing a test of RECO beacon which use a nordic chipset, nrf51822. But something strange came up to me during the test with Ellisys bluetooth analyzer. The problem is that the RECo beacon sends scan response without any scan request. Please take a look of the highlighted area of the attached picture.

Any comments on this ?

My test configuration are as follows;

1. Wireless Test
2. Office environment : There are many Bluetooth scanner in the same room.
3. RECO beacon : the device address(D8 4E 4E E1 CD F9). I used the iBeacon example code.
4. My smart phone plays a role of scanner with the device address(4A F1 E3 4B A0 C2).
5. I used the software filter only to filter the devices. (D8 4E 4E E1 CD F9 & 4A F1 E3 4B A0 C2)

[Stian Røed Hafskjold]

Since you are filtering on the two devices D84E4EE1CDF9 and 4AF1E34BA0C2, maybe the scan request is not shown in the list if the scan request comes from another scanner that is filtered out?

[Jusang Kim]

Thank you for your replay again. It makes me energetic to figure the problem out now.

Anyway, i still meet the error in wireless office environment. It is easy to reproduce the error in wireless office environment. It seems like the Ellisys display the previous scanner's address when it does not receive the scan request. And i believe that the receiver sensitivity performance of the Ellisys is poor. Those two things makes this kind of error on Ellisys. It is my guess. If we use the wired test environment then we can solve what the problem is correctly. What's your opinion on this ?