BLE scan and UART data reception issue

RE: BLE scan and UART data reception issue

user72692 — Mon, 30 May 2022 11:58:28 GMT

I'm still not able to reproduce your issue. I set up 5 advertisers around the device running your sample and waited respectively 5 and 9 minutes, but the serial log showed up immediately.

However, could you try the following:

Increase the priority of the thread handling the UART communication and turn down the priority of the other threads
- This may be useful: https://www.youtube.com/watch?v=kV9Ab0Opxyc
Use less aggressive scan parameters
Use flow control

Also, could you check if you're able to reproduce the issue in an area without any BLE activity, so we can confirm that the issue is actually due to the scanner handling adv. packets.

Best regards,

Simon

RE: BLE scan and UART data reception issue

user72692 — Wed, 25 May 2022 19:41:39 GMT

I'm not able to reproduce it. I did the following:

Modifed the file nrf52840dk_nrf52840.overlay like shown below, so uart0 is connected to the interface MCU and the computer

&uart0 {
	compatible = "nordic,nrf-uarte";
	status = "okay";
	current-speed = <1000000>;
//	hw-flow-control;
	/*tx-pin = <6>;
	rx-pin = <4>;
	rts-pin = <41>;
	cts-pin = <8>;*/
};

Built and flashed the sample to an nRF52840DK v3.0.0
Opened RTT Viewer and a Termite instance with the following settings

I saw that the program started by looking at the RTT logs
Waited around 7 minutes and sent the following through termite: "1234567890" and got the following response in RTT 1-2 seconds later:

00> [00:07:45.290,069] <inf> mt_uart: Evt RX_READY.
00> [00:07:45.290,191] <inf> mt_uart: Evt RX_BUF_REL.
00> [00:07:45.290,222] <inf> mt_uart: Evt RX_BUF_REL.
00> [00:07:45.290,252] <inf> mt_uart: Evt RX_DISABLE.
00> [00:07:45.290,313] <inf> mt_uart: Evt RX_BUF_REQ.
00> [00:07:45.290,435] <inf> event_manager: [0038] UART_RECV_REPORT
00> [00:07:45.290,527] <inf> main: UART received data:
00>                                31 32 33 34 35 36 37 38  39 30 0a                |12345678 90.

I waited 10 more minutes and sent a new string, but I got the response immediately

Maybe it is because I'm in home office without much advertising around, and the scanner is not too busy parsing packets. I will try in the office on Monday.

Best regards,

Simohn

RE: BLE scan and UART data reception issue

user72692 — Tue, 24 May 2022 15:29:05 GMT

Sorry for the delay on this, I've been quite busy lately. I will priotize your issue tomorrow

Best regards,

Simon

RE: BLE scan and UART data reception issue

user104364 — Tue, 24 May 2022 02:18:33 GMT

How's it going? Did you find a problem?

RE: BLE scan and UART data reception issue

user72692 — Wed, 18 May 2022 15:35:56 GMT

Thanks for uploading the project. I will take a look at it tomorrow

Best regards,

Simon

RE: BLE scan and UART data reception issue

user104364 — Wed, 18 May 2022 06:14:14 GMT

test-devzone.nordicsemi.com/.../nrf52.zip

Here is my test demo.

Originally, I used nRF9160 to communicate with it. The nRF9160 sends data through key control. Now it is connected to the PC and tested through the serial port tool.

The device runs normally at the beginning, wait for a period of time (a few minutes or more) and then send data through the serial port assistant on the PC side, the device cannot receive it immediately, and prompts to receive data after a long delay.

RE: BLE scan and UART data reception issue

user72692 — Mon, 16 May 2022 15:52:38 GMT

Hello Kenny,

It is hard to say what may cause the issue.

Could you enable logging to see if you get some more information about the fault? Assert? Hard fault? Error?

I can see that you have shared a lot of files, but would you be able to share a minimal project, including main.c that reproduces the issue, and provide some detailed steps how to reproduce it? That would make it much easier to debug on my side.

Best regards,

Simon