Unable to obtain repeatable scan response data.

[Sam273]

 Unable to obtain repeatable scan response data.

I can obtain advertising data and scan response data from 3rd party devices. I can obtain advertising data from my server repeatably, but when I try and obtain scan response data from the server I only receive it  once in a 20 minutes period.

I can see consistent scan response data from other BLE devices around.

I have access to both client and server. 

The server is configured as :

 

The client sets up to :

 

 

I print both the scan and advertised data.

I then call scan resume continuously to scan for devices (without the scan parameters).

[Edvin]

Hello,

What SDK are you using?

Are you sure that your device has advertising response, and that you are not picking up advertising packets from another device nearby with scan response? Check the address of the device.

Are you sure your device is not resetting? (encounters an error)? Can I see the messages you get when you use NRF_LOG_DEBUG()? (I assume LOG_DEBUG() uses this).

[Sam273]

Hi Edvin,

I'm using SDK 15.2

Currently for debugging I just have a infinite loop of searching for devices - scan and advertising data..

I'm printing any advertised data by printing the UUID - this is working fine as im seeing my and other devices (I can connect to my device with this data)

I'm printing any scan response data - I am seeing a variety of devices, garmin, Versa, LE-reserved, ect

and the scan response data from my device - I am not/ rarely it seeing. 

If i do find a scan response data from my device i check the address i came from to check it matches with the advertised data found. 

Thanks, 

Sam

[Edvin]

Ok. so you see it some times, but rarely. What is your clock settings on your device? What HW do you use (Both peripheral and central)? Are the DKs? Or some custom HW? Have you tried to sniff the advertisements? Does it actually send any scan responses? You can use the nRF Sniffer for this.

[Sam273]

64Mhz interanl clock. I have two custom pieces of hardware with NRF52832 devices on for both my central and peripheral. 

Yes i'm using the nrf sniffer and i can see scan responses:

[Edvin]

I was thinking of whether you had an external LFXTAL. Do you? What are the specs on the LFXTAL if you have one? And what are your defines in sdk_config.h:

#define NRF_SDH_CLOCK_LF_SRC
#define NRF_SDH_CLOCK_LF_RC_CTIV
#define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV
#define NRF_SDH_CLOCK_LF_ACCURACY

I can't say why you are not getting your scan responses from that particular device. From where do you call fnOnAdvReport()? Do you have any filtering before that call?

[Sam273]

No I am using the internal oscillator, no LFXTAL.

fnOnAdvReport is called from a softdevices event BLE_GAP_EVT_ADV_REPORT. 

[Edvin]

What is your peripheral? Is that also a nordic? Is that also using the internal oscillator?

So for both your central and peripheral. What is:

#define NRF_SDH_CLOCK_LF_SRC
#define NRF_SDH_CLOCK_LF_RC_CTIV
#define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV
#define NRF_SDH_CLOCK_LF_ACCURACY

BR,

Edvin