HTTP integration to Tago Example

indusconn · April 29, 2019, 9:33pm

in case it might help someone
I’m sending temperature and humidity from node
Cayenne LPP codec
here is the configuration in loraserver application

and payload parser in tago.io

// Add ignorable variables in this array.
const ignore_vars = ['applicationID','adr','applicationName','deviceName','devEUI','gatewayID','name',
                       'rssi','loRaSNR','location','frequency','fPort','fCnt','txInfo','rxInfo','object'];

function toTagoFormat(object_item, serie, prefix = '') {
const result = [];
  for (const key in object_item) {
    if (ignore_vars.includes(key)) continue;

    if (typeof object_item[key] == 'object') {
      result.push({
        variable: object_item[key].variable || `${prefix}${key}`,
        value: object_item[key].value,
        serie: object_item[key].serie || serie,
        metadata: object_item[key].metadata,
        location: object_item[key].location,
        unit: object_item[key].unit,
      });
    } else {
      result.push({
        variable: `${prefix}${key}`,
        value: object_item[key],
        serie,
      });
    }
  }

  return result;
}

if (!payload[0].variable) {
   //Get a unique serie for the incoming data.
   const serie = payload[0].serie || new Date().getTime();
 
  payload = toTagoFormat(payload[0], serie);
  
  const rawObject = payload.find(item => item.variable === "data");
  var rawData = rawObject.value;//.toString('utf8');  
  const buffer = Buffer.from(rawData, 'base64');
  payload.push({"variable" : "buffDisplay" , "value" : buffer.toString('hex')})
  payload.push({"variable" : "Temperature" , "value" : buffer.slice(2,4).readInt16BE() / 10 , "unit" : '°C' });
  payload.push({"variable" : "Humidity" , "value" : buffer.slice(6,7).readUInt8() / 2 , "unit" : '%' });
}

Regards
Mike