envctrl_get_sys_temperatures
envctrl_get_sys_temperatures(unitp, tempr);
envctrl_get_sys_temperatures(unitp,
envctrl_get_sys_temperatures(unitp, (uint8_t *)NULL);
envctrl_get_sys_temperatures(unitp,
envctrl_get_sys_temperatures(unitp, (uint8_t *)NULL);
static void envctrl_get_sys_temperatures(struct envctrlunit *, uint8_t *);