I am not a lawyer but I'm pretty certain you are supposed to refrain from any "work" activity. So yes, you have broken the law. I can also tell you nobody abid

I am not a lawyer but I'm pretty certain you are supposed to refrain from any "work" activity. So yes, you have broken the law. I can also tell you nobody abides by this interpretation and it's virtually impossible to enforce. But your entry will be denied if you tell the immigration officer that you're going to be doing "work" that is not permissible under the specifics of the visa you're entering with. There are some other situations that are covered by a normal business visa and are work-like.