Hi @tzaccai, great! Glad to hear you got things up and runnning and thanks for letting us know.
With regards to the CONTEXT variable, this will depend of each specific implementation, however you are able to pass a pointer to any specific context (if you should need it in their implementation). If you don’t need any, you may simply pass NULL, as we do in our example, or any random value for that matter.
Please do let us know if we can provide to you any further information. Best Wishes.