Thanks for the answer.
I use flirc_util.exe with the parameter sendir --raw=, and it works. However, I wanted to try calling the functionality via the DLL, as it might work faster. Unfortunately, I couldn't find useful information or examples on how to work with libflirc.dll in the package available at https://github.com/flirc/sdk.
I tried to enter the code 930,841,915,830,1827,1745,930,835,1822,844,933,870,925,830,930,1731,1831,839,839 on the page https://ir.flirc.io/ for example, but I didn't get an answer. What did I do wrong?