array(12) {
  ["version"]=>
  int(2)
  ["device_id"]=>
  int(6543)
  ["ch0_pulse_count_value"]=>
  int(4)
  ["ch0_pulse_interval_value"]=>
  int(600)
  ["ch0_pulse_interval_unit"]=>
  string(1) "s"
  ["ch0_cumulative_pulse_count_value"]=>
  int(68592)
  ["ch1_pulse_count_value"]=>
  int(0)
  ["ch1_pulse_interval_value"]=>
  int(600)
  ["ch1_pulse_interval_unit"]=>
  string(1) "s"
  ["ch1_cumulative_pulse_count_value"]=>
  int(57038)
  ["battery_voltage_value"]=>
  float(3.123)
  ["battery_voltage_unit"]=>
  string(1) "V"
}
array(4) {
  ["version"]=>
  int(2)
  ["device_id"]=>
  int(6543)
  ["battery_voltage_value"]=>
  float(3.123)
  ["battery_voltage_unit"]=>
  string(1) "V"
}