array(6) {
  ["version"]=>
  int(2)
  ["device_id"]=>
  int(6019)
  ["strain_gauge_value"]=>
  float(1713.0065082323)
  ["strain_gauge_unit"]=>
  string(12) "µm⋅m⁻¹"
  ["battery_voltage_value"]=>
  float(3.123)
  ["battery_voltage_unit"]=>
  string(1) "V"
}
array(4) {
  ["version"]=>
  int(2)
  ["device_id"]=>
  int(6019)
  ["battery_voltage_value"]=>
  float(3.123)
  ["battery_voltage_unit"]=>
  string(1) "V"
}