@ntrip/nmea v0.1.0

NMEA-0183 Decoder/Encoder

Decoder/encoder for NMEA-0183 message types.

Basic Usage

Decoding

let buffer: string = ...; // String containing NMEA sentence
let message: NmeaMessage = NmeaTransport.decode(buffer);

Encoding

let message = ...; // Message to be encoded
let buffer: string = NmeaTransport.encode(message);

Streams

Built in transform streams to convert from NmeaMessages to sentence strings and vice-versa.

let input: stream.Readable = ...;
let output: stream.Writable = ...;
input                                      // Stream of sentence strings
    .pipe(new NmeaDecodeTransformStream()) // Stream of NmeaMessage objects
    .pipe(new NmeaEncodeTransformStream()) // Stream of (identical) sentence strings
    .pipe(output);

NmeaDecodeTransformStream can optionally synchronize with the data stream e.g. if it starts receiving data from the middle of a message.

Messages Supported

• DTM (NmeaMessageDtm)
• GBS (NmeaMessageGbs)
• GGA (NmeaMessageGga)
• GLL (NmeaMessageGll)
• GNS (NmeaMessageGns)
• GRS (NmeaMessageGrs)
• GSA (NmeaMessageGsa)
• GST (NmeaMessageGst)
• RMC (NmeaMessageRmc)
• TXT (NmeaMessageTxt)
• VLW (NmeaMessageVlw)
• VTG (NmeaMessageVtg)
• ZDA (NmeaMessageZda)

License

LGPL