array(11) {
  ["version"]=>
  int(2)
  ["device_id"]=>
  int(867)
  ["dielectric_permittivity_value"]=>
  float(1.53)
  ["volumetric_water_content_value"]=>
  float(-0.02091167031147)
  ["volumetric_water_content_unit"]=>
  string(12) "m³⋅m⁻³"
  ["soil_temperature_value"]=>
  float(22.5)
  ["soil_temperature_unit"]=>
  string(3) "°C"
  ["electrical_conductivity_value"]=>
  int(1)
  ["electrical_conductivity_unit"]=>
  string(13) "µS⋅cm⁻¹"
  ["battery_voltage_value"]=>
  float(3.168)
  ["battery_voltage_unit"]=>
  string(1) "V"
}
array(4) {
  ["version"]=>
  int(2)
  ["device_id"]=>
  int(867)
  ["battery_voltage_value"]=>
  float(3.168)
  ["battery_voltage_unit"]=>
  string(1) "V"
}