Reading voltage level using AT%XVBAT.

[AMG]

Hi, 

I am trying to get the voltage level of the battery using the AT_command AT%XVBAT which I tested using the at_client sample. I tried integrating it with my current code but I didnt get any values. Which goes something like that.

#define AT_BATTERY        "%XVBAT"

char battery[32] = {0};

 at_cmd_write(AT_BATTERY, NULL, sizeof(battery), NULL);

[AMG]

iot_status_t device_battery(char* battery, int len) {
  iot_status_t retval = IOT_SUCCESS;

  int ret;

  ret = at_cmd_write(AT_BATTERY, battery, len, NULL);
  if (ret != 0) {
    retval = IOT_DEVICE_INFO_ERROR;  
  }
  return retval;
}