Module em_timer: Do not use or include this file include/add-ons/event_machine_timer.h anymore. EM timer is moved under EM API.
Global EM_TIMER_CLKSRC_CPU: Temporary backwards compatibility, will be removed later
Global EM_TIMER_CLKSRC_EXT: Temporary backwards compatibility, will be removed later
Global em_tmo_set_rel (em_tmo_t tmo, em_timer_tick_t ticks_rel, em_event_t tmo_ev): Do not use for periodic timeouts