NULL doesn't match !conn

Question

Hello community! 
 
 I know this sounds almost impossible... but it's happening 
 
 I'm debugging an application based on peripheral_uart. When I call

bt_nus_send(NULL, buf->data, buf->len);

if I debug this sentence in bluetooth\services
us.c:92:

if (!conn) {

it doesn't interpret conn as NULL (!) and the condition is never true.

I found this case app_sched_event_put NULL data pointer is not NULL - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com) but it has nothing to do with my problem. 
 
 My environment: 
 - Windows + Visual Studio Code + nRF Connect 
 - nRF52840 DK 
 
 Any clue about where my problem is? 
 
 Thank you! 
 David.

user7377 · Accepted Answer

Hi David, 
 You write that you see this when debugging. Could it be simply that you have built your application with optimization and is stepping or similar? In that case the machine code will not match the C code, and things will look strange. If so, I suggest enabling debug optimization ( CONFIG_DEBUG_OPTIMIZATIONS=y ). If that is not the issue, then it would be interesting if you could share a project and instructions on how to reproduce so that I can have a look on my end. 
 Einar

NULL doesn't match !conn

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