Thanks a lot Erik, thats what I guessed. In my first try I had a link to developer.mbed.org ... and I supposed that was the culprit. Then, as it was a link to code to show my test case, I changed it to < <program users/...> >, but some filter still didn't like it. I also had some code snippet with source code. At the end, I had to delete everything and only leave the description of my question with no links to a published code or code snippet. It was accepted but pending of approval. When it gets approved I will try to edit it and put the whoe information, otherwise my question will be difficult to answer :-D

I understand there have been lots of issues with spam, and as this was my first question in mbed (I use to try by myself and look for existing answers before opening duplicated questions), I must be a kind of untrusted user and the bar might be a bit higher in such a cases. Anyway, just in case some forum manager is reading this, it would be great to have some guidelines of obvious things to avoid being rejected, for instance not including links to external sites. Thank you and best regards.