Timer_older_than return false in light switch example with UART communication

[Arij]

Hi,

I'm working on a project where i need first to send string data from terminal pc to client board which is nRF52832 using UART and then send this data over mesh to other servers

so i combined UART example with light switch demo from mesh sdk v1.0.1 

now i can send  characters over mesh using uart, but i want to send string data so i defined two functions for reading and writing string data with UART and this error occurs 

the error seems to be in bearer_handler.c file at line 245 as shown in the figure.

it is something related with TIMER_OLDER_THAN() function which return false in my case 

how to solve it ? someone help please, i'll appreciate it

here is the functions added 

Thank you

[Bjørn Kvaale]

Could you double check in your map file (found inside the build folder of your example code) that the 0x0002EF8A refers to the TIMER_OLDER_THAN() or bearer_handler_action_end() function just to double check this is where the error is occuring? Just take a look at the .map file & try to find the 0x0002EF8A  location in memory & let us know what the comment is for that memory location. It might be that this exact location is not in memory, but then you can take a look at the next values that are in between this memory location.

Did you refer to the coexistence with other nordic SDK's to merge the mesh sdk with uart? Which UART example code version are you using? SDK 14.2?

My guess is that uart_putstring() & uart_getstring() are taking too much time to complete, which then leads to the MESH ASSERT message you mention. This line in the link above might be helpful too: "By design, the SoftDevice activity is prioritized over mesh activity. Therefore, you should keep the connection and advertisement intervals used by the SoftDevice as large as possible (i.e. infrequent) when using Bluetooth low energy connections."

 

[Arij]

Thank you for your reply. I double checked in map file and i think it refers to TIMER_OLDER_THAN() function, 

here what i found in this file

 

I included uart modules to the light switch client example and did some changes in the flash_placement.xml so i didn't follow the coexistence with other nordic SDK's , i used the UART example from SDK v14.2.

I agree with you about the two functions taking too much time to complete, what should i do in this case?

[Bjørn Kvaale]

Did you try to update the connection & advertisement intervals by increasing their values? I would increase those values a bit every time until you do not get the error anymore.

[Arij]

I don't know how to do it, can you please help me on that?

[Bjørn Kvaale]

define MIN_CONN_INTERVAL MSEC_TO_UNITS(100, UNIT_1_25_MS)
define MAX_CONN_INTERVAL MSEC_TO_UNITS(500, UNIT_1_25_MS)

Set the min connection interval to 100 milliseconds (as according to comments here). 

#define APP_ADV_INTERVAL                288  

I would start by only increasing the min conn interval & testing to see if that helps. If that doesn't help, try increasing the advertising interval too.

[Arij]

Sorry for asking too much, where can i find these lines in the light switch demo,

Is it in ble_gap.h ?