array(13) {
  ["version"]=>
  int(2)
  ["device_id"]=>
  int(6252)
  ["status_value"]=>
  int(0)
  ["temperature_value"]=>
  float(21.46)
  ["temperature_unit"]=>
  string(3) "°C"
  ["oxygen_saturation_value"]=>
  float(97.52)
  ["oxygen_saturation_unit"]=>
  string(1) "%"
  ["oxygen_concentration_value"]=>
  float(8.69)
  ["oxygen_concentration_unit"]=>
  string(11) "mg⋅L⁻¹"
  ["oxygen_concentration_alt_value"]=>
  float(8.69)
  ["oxygen_concentration_alt_unit"]=>
  string(3) "ppm"
  ["battery_voltage_value"]=>
  float(3.168)
  ["battery_voltage_unit"]=>
  string(1) "V"
}
array(4) {
  ["version"]=>
  int(2)
  ["device_id"]=>
  int(6252)
  ["battery_voltage_value"]=>
  float(3.168)
  ["battery_voltage_unit"]=>
  string(1) "V"
}