I do not see the callback set in the code snippet you've posted. I'm fairly certain you need to call $oscar->set_callback_im_in(\&im_in) before you can expect that to be mapped. If it is called before your loop, then you should post the complete code where it is called (perhaps \&signon_done?). The do_one_loop method should call your im_in method if there's a message on the server (assuming your sleep(5) isn't causing connection problems).