Siemens Linux Embedded Security Developer for Railway Automation interview questions

I applied through an external recruiter because I was interested in the the area. The original job highlighted things like "good knowledge of Linux, preferably embedded, standard networking protocols based on TCP/UDP, some orientation in security". I told the recruiter my current salary and expectations (I asked for less pay, due to a lack of experience in the embedded area, but as Linux application developer I thought I would fit in very well and was highly motivated to learn something new). At the interview I got a standard C language test (see below). Then a senior person came in, looked at my personal profile on paper with a weird look and immediately said: "with the salary you have now and with your salary expectation you should stay in your current area and job!". My expectation was 55.000 CZK. I got a look at the summarized personal profile he had and it was nothing like my well formatted resume, as the internal HR team seem to have copy pasted my original resume in a very unstructured document. The rest of the short interview was let me know I was not about to be hired... It was quite rude and non-professional, but at least, it was time saving for both sides. It would be expected that Siemens and its external headhunters had better communication and clear expectations on the salary range they were willing to offer. I'm very glad for this experience and thankful that I did not get hired! I later found that the same job advert has been orbiting around many job portals for a long time with offered salary of 30 to 40k CZK (which is really below the average for Prague's IT industry).