I found a library which helps me implement something for a company:
<https://www.openmuc.org/sml/>

Its license is LGPL. Unfortunately, I'd like to use this library for an Android project and there I have to use a different SerialPort-API. This means I had to change some lines of code.

Now I use "my" modified version of the code. What do I have to do to include it in a commercial (and proprietary) product? Is it just fine if I release the library on GitHub with LGPL? Or are there other side effects for the company which uses this library?