BLE connecting and disconnecting reset program

RE: BLE connecting and disconnecting reset program

Wei — Mon, 07 Oct 2019 14:47:47 GMT

Hi Dmitry:

Thanks for your kind reply.

We are developing some special project, which have a insufficient power driving capability. So, the sampled signal quality will be sensitive to the BLE data transmission and even BLE advertising. That's why I want to turn off BLE data transmission and even BLE advertising in the data sampling. And after a specific time when there is enough samples ready for data transmission, the code start advertising and BLE transmission.

Best

RE: BLE connecting and disconnecting reset program

Wei — Mon, 07 Oct 2019 14:40:03 GMT

Hi Turbo:

Thanks for your prompt reply.

It's just because this project was started 2 years ago, using SDK13.0. We just base on that for to continue the project for convenience.

In my code, after advertising_start(), the ble_nus_string_send() is called to transfer data out.

If I add nrf_delay_ms(800) between advertising_start() and ble_nus_string_send(), the program will not be reseted. At least for a long time.

Do you know what's the reason for this? why I need a Delay before ble_nus_string_send().

Thanks

Wei

RE: BLE connecting and disconnecting reset program

Dmitry — Sun, 06 Oct 2019 12:31:42 GMT

Hi,

Just wondering if you're on right way.. if your case assumes one session, for example, in 2-3 hours, it's ok. But if your device will trigger data exchange once per 5-10 minutes, it's better to maintain connection with high slave latency, because power consumed while negotiation will whittle away the gain got by disconnecting device.

RE: BLE connecting and disconnecting reset program

Turbo J — Sun, 06 Oct 2019 10:38:51 GMT

[quote userid="67217" url="~/f/nordic-q-a/52936/ble-connecting-and-disconnecting-reset-program"]SDK version: SDK 13.0[/quote]

Why the old SDK? Most recent SDK for the nrf52832 is 15.3 version.

Your best bet is to hook up a debugger and check which one of the APP_ERROR_CHECK() triggers.

My (wild) guess would be: Starting advertizing twice and thus getting error from ble_advertising_start() function.