/** installs a timeout with the first timeout of 'value_msec' and then a periodic timeout with
* 'interval_msec'. '_callback' is the callback function when the timer reaches the timeout.
* returns a pointer to the timeout, which is needed for stopping it again
/** installs a timeout with the first timeout of 'value_msec' and then a periodic timeout with
* 'interval_msec'. '_callback' is the callback function when the timer reaches the timeout.
* returns a pointer to the timeout, which is needed for stopping it again