complete-teltonika-parser

TeltonikaParser

Install this parser using npm: npm i complete-teltonika-parser

const { ProtocolParser, parseIMEI, Data, GPRS } = require('complete-teltonika-parser')
const packet = '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'
let parsed = new ProtocolParser(packet)
console.log(parsed)
if (parsed.CodecType == "data sending") {
    let data = parsed.Content as Data
} else {
    let gprs = parsed.Content as GPRS
}

const imei = parseIMEI('000F333532303933303839313638383231')
console.log(imei)

Q: How can I know that a packet is the device imei or the data packet?

A: The packet containing the imei has a constant length: 34

function processPacket (packet) {
    if (packet.length == 34) {
        return {
            imei: parseIMEI(packet)
        }
    } else {
        return { 
            dataPacket: new ProtocolParser(packet)
        }
    }
}

ProtocolParser has the following signature:

class ProtocolParser {
    Packet : string
    Preamble: number
    Data_Length: number
    CodecID: number
    Quantity1: number
    CodecType: 'data sending' | 'GPRS messages'
    Content : GPRS | Data | null
    Quantity2: number
    CRC: number
    constructor(packet: string, basic_read: boolean, on_ioElement_error: (e: Error) => void) {
      // code
    }
}

class Data {
  AVL_Datas : AVL_Data[]
}

class AVL_Data  {
    Timestamp : Date
    Priority : number
    GPSelement : GPSelement
    IOelement : IOelement
}

class GPSelement {
    Longitude : number,
    Latitude : number,
    Altitude : number,
    Angle : number,
    Satellites : number,
    Speed : number
}

class IOelement {
    EventID: number
    ElementCount: number
    Elements: {
        [avlid: number]: number | string
    }
}

class GPRS {
    type : 5 | 6
    isResponse : boolean
    responseStr : string
}

Where if basic_read == true, then the property 'Content' will not be parsed.

Notice that values from IOelement.Elements can also be string. Thats because some values may be too bit to fit javascript's number type. To ilustrate that, here is the actual code to extract the value:

function extractValue (x: string) => {
  var y: number | string = parseInt(x, 16);
  if (y > Number.MAX_SAFE_INTEGER) {
    y = BigInt(`0x${x}`).toString();
  }
  return y;
}

NOTICE

• If the data packet has an invalid CRC, then the parser will fail throwing an exception;
• The only GPRS codec supported is Codec 12;
• This is a PROTOCOL parser. It does not parse the device IMEI. For that, use the function parseIMEI;
• The file "AVL Data Parser/IOelement" has some useful funcitons and an avl id translator for teltonika device model FMB640.