Porting code from SDK v15.0 to 17 - problem with ble_nus_data_send

[Avi]

I have a working code which implements a UART peripheral written originally with SDK15.0

I would like to port it to the latest SDK 17.02 

I can get advertisement and I can connect with a smartphone. 

I can write data from the smartphone to the UART, but the opposite direction doesn't work

I get error and reset

I found that the problem is in ble_nus_data_send

What could be the reason (difference between SDK15 to SDK17)?

[Karl Ylvisaker]

Hello,

It is as @awneil said, we will need the error message to identify the root cause of your issue.
Could you make sure that DEBUG is defined in your preprocessor defines, like shown in the included image?

This will make a debug statement be printed to your logger, when APP_ERROR_CHECK is passed an error code different from NRF_SUCCESS.
Please make sure DEBUG is defined, and let me know what this error message reads. We may then begin looking into why this error message is generated.

Looking forward to resolving this issue together!

Best regards,
Karl

[Avi]

I can see that 

(conn_id = p_link_ctx_storage->max_links_cnt)

Both equal to 1 and then it gets NRF_ERROR_NO_MEM

[Karl Ylvisaker]

You said previously that you had found the problem to be in the ble_nus_data_send function.
I would appreciate it if you could show me the full error message.

What is your NRF_SDH_BLE_TOTAL_LINK_COUNT defined to in your project, and how many concurrent connections do you intend to hold?

Best regards,
Karl

[Avi]

I meant that during debugging of why I don't get response, starting from the ble_nus_data_send, I found that I get ERROR which I described later.

The value is:

#define NRF_SDH_BLE_TOTAL_LINK_COUNT 1 

[Karl Ylvisaker]

Avi said:

I meant that during debugging of why I don't get response, starting from the ble_nus_data_send, I found that I get ERROR which I described later.

Yes, I have understood this.
The reason I would appreciate seeing the full error message is to make sure this in fact is where and why your application resets.
It is also a great feature to use when developing your application further.

Avi said:

The value is:

#define NRF_SDH_BLE_TOTAL_LINK_COUNT 1 

Thanks for clarifying.

Karl Ylvisaker said:

how many concurrent connections do you intend to hold?

Looking forward to resolving this issue together!
 
Best regards,
Karl

[Avi]

In my previous code it was set to 2.

But if I put this number in SDK17, the code doesn't start. Maybe there are some other changes in the config file?