SCAN_REQ as ACKNOWLEDGEMENT

[Madhuri]

Hello all, I am implementing an energy efficient system, in which I am advertising in BLE_GAP_ADV_TYPE_ADV_SCAN_IND mode, I am using scan_req_report as an acknowledgement from a phone(my central device) after which i would like to stop advertising.

I use nRF51822xAA, SDK 9.0.0, sd110 8.0.0 and keil uVision5

I observe the following:

1.After my device receives scan request report (as seen in the debugging mode), it reaches sd_ble_evt_get funtion and subsequently HARDFAULT error.

2.When not in debugging mode, my device is not responding with a scan response for scan requests it receives(as observed by the sniffer).

main.c

Please interpret the observations I have made and suggest the best way to use SCAN_REQ as an ACK.

Thank you

[Hung Bui]

Hi,

Regarding your points:

1. Are you stepping in the code or you get the debug information by printing out debug log ? If you simply stepping in the code, step over sd_ble_evt_get() function will cause a hardfault because the softdevice won't work after a breakpoint.

2. This behavior you observed when you use the attached code ? or when before you comment out the code to put the device in deep sleep mode ? If you test with any example in the SDK do you see the same behaviour ? I suspect that either you have some code to put the device to deep sleep, or there was something else crashed

[Madhuri]

Hi hung Bui I solved that problem regarding my first observation and the second, I am able to receive scan requests successfully and stop advertising after one second of advertising timeout. Now I have a new problem that is when the code runs it stops with an error of insufficient memory. Which memory insufficiency is it referring to? Scheduler buffer ?

[Hung Bui]

Please describe exactly where you get the "insufficient memory error" and what throw it .

[Madhuri]

I do the following: I am running the code in debug mode with no breakpoints , on switch press I observe advertisements, after say 8 to 10 rounds of switch presses and advertisements , advertising stops when i stop debugging on this, it is in a while loop of app_error_handler which i saw the error_code is 4. I don't know how to debug this. Please guide

[Hung Bui]

You need to find the filename and the line number that result the error code 4. To do that you need to add DEBUG flag in to preprocessor Symbols to enable debug mode on the app_error library. Please have a look here and here