array(7) {
  ["version"]=>
  int(2)
  ["device_id"]=>
  int(303)
  ["distance_value"]=>
  int(1234)
  ["distance_unit"]=>
  string(2) "mm"
  ["number_of_valid_samples_value"]=>
  int(1)
  ["battery_voltage_value"]=>
  float(2.993)
  ["battery_voltage_unit"]=>
  string(1) "V"
}
array(4) {
  ["version"]=>
  int(2)
  ["device_id"]=>
  int(303)
  ["battery_voltage_value"]=>
  float(2.993)
  ["battery_voltage_unit"]=>
  string(1) "V"
}