NMEA-0183 decoder/encoder
npm install @gnss/nmea``
npm install -S @gnss/nmea
typescript
let buffer: string = ...; // String containing NMEA sentence
let message: NmeaMessage = NmeaTransport.decode(buffer);
`#### Encoding
typescript
let message = ...; // Message to be encoded
let buffer: string = NmeaTransport.encode(message);
`$3
Messages can be manually constructed using , which requires all message properties to be provided.
`typescript
NmeaMessageGga.construct({
talker: NmeaTalker.NAV_SYSTEM_GNSS,
time: new Date(0, 0, 0, 1, 2, 3, 0),
latitude: 66.66,
longitude: 33.33,
quality: NmeaFixQuality.SIMULATOR,
numberSatellites: 10,
hdop: 2.5,
altitude: 180.00,
geoidalSeparation: 90.00,
differentialAge: 5,
differentialStationId: 'differentialStationId',
})
`$3
Transform streams to convert from s to sentence strings and vice-versa.
`typescript
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);
` 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_)
- GSV (_NmeaMessageGsv_)
- RMC (_NmeaMessageRmc_)
- THS (_NmeaMessageThs_)
- TXT (_NmeaMessageTxt_)
- VHW (_NmeaMessageVhw_)
- VLW (_NmeaMessageVlw_)
- VPW (_NmeaMessageVpw_)
- VTG (_NmeaMessageVtg_)
- ZDA (_NmeaMessageZda_)Testing
npm test`