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fields = switch req.query.msgType
  when '0' then ['timestamp', 'macAddress', 'gatewayBattery', 'rssi']
  when '2' then ['timestamp', 'macAddress', 'gatewayBattery', 'gatewayEventCode', 'rssi']
  when '4' then ['timestamp', 'macAddress', 'sensorEventStart', 'sensorEventEnd', 'rssi', 'sensorHubBattery', 'sensorHubMacAddress', 'sensorHubRssi']
  when '5' then ['timestamp', 'macAddress', 'rssi', 'numberOfSensors', 'sensorHubBattery', 'sensorHubData1', 'sensorHubData2', 'sensorHubData3', 'sensorHubMacAddress', 'sensorHubRssi', 'sensorHubType']