cesanta/mongoose-os

confused on the parameters given for timer_callback, in particular how to convert the void pointer to an int.

#include "mgos.h"

static void timer_cb(void * arg) {
  //int ledPin = *((int *) arg);
  int ledPin = *(int*) arg;

  static bool s_tick_tock = false;

  LOG(LL_INFO,
      ("%s uptime: %.2lf, RAM: %lu, %lu free on pin %i", (s_tick_tock ? "Tick" : "Tock"),
       mgos_uptime(), (unsigned long) mgos_get_heap_size(), (unsigned long) mgos_get_free_heap_size(), ledPin));

  s_tick_tock = !s_tick_tock;

  if (ledPin >= 0) {
    mgos_gpio_toggle(ledPin);
  }
}

enum mgos_app_init_result mgos_app_init(void) {
  int ledPin = mgos_sys_config_get_board_led1_pin();

  if (ledPin >= 0) {
    mgos_gpio_setup_output(ledPin, 1);
  }

  mgos_set_timer(1000 /* ms */, MGOS_TIMER_REPEAT, timer_cb, &ledPin);

  LOG(LL_INFO, ("pin %i", ledPin));

  return MGOS_APP_INIT_SUCCESS;
}

i have tried the above code on an esp32 and an esp8266 and the results are pretty consistent. the LOG statement in mgos_app_init() will show the correct pin number for LED1 ( 2 or 13 ).

when i try to dereference the void pointer in timer_cb(), it doesn't show the the same number as i pass in; on the esp8266 it will almost always show -1, while on the esp32 it will vary widely.

my intent is to be able to have the same callback function just with a different pin number assigned to it ( and wait time fwiw ) depending on the remain logic.

I'm sure i'm doing something silly and any help would be appreciated. Thank you.