array(5) {
  ["version"]=>
  int(2)
  ["device_id"]=>
  int(4369)
  ["potentiometer_position_value"]=>
  float(0.048846483230591)
  ["battery_voltage_value"]=>
  float(3.156)
  ["battery_voltage_unit"]=>
  string(1) "V"
}
array(4) {
  ["version"]=>
  int(2)
  ["device_id"]=>
  int(4369)
  ["battery_voltage_value"]=>
  float(3.156)
  ["battery_voltage_unit"]=>
  string(1) "V"
}