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package nmea
const (
// TypeVDM type for VDM sentences
TypeVDM = "VDM"
// TypeVDO type for VDO sentences
TypeVDO = "VDO"
)
// VDMVDO is sentence ($--VDM or $--VDO) used to encapsulate generic binary payloads. It is most commonly used with AIS data.
// https://gpsd.gitlab.io/gpsd/AIVDM.html
//
// Format: !--VDO,x,x,x,a,s--s,x*hh<CR><LF>
// Format: !--VDM,x,x,x,a,s--s,x*hh<CR><LF>
// Example: !AIVDM,1,1,,B,177KQJ5000G?tO`K>RA1wUbN0TKH,0*5C
type VDMVDO struct {
BaseSentence
NumFragments int64
FragmentNumber int64
MessageID int64
Channel string
Payload []byte
}
// newVDMVDO constructor
func newVDMVDO(s BaseSentence) (Sentence, error) {
p := NewParser(s)
m := VDMVDO{
BaseSentence: s,
NumFragments: p.Int64(0, "number of fragments"),
FragmentNumber: p.Int64(1, "fragment number"),
MessageID: p.Int64(2, "sequence number"),
Channel: p.String(3, "channel ID"),
Payload: p.SixBitASCIIArmour(4, int(p.Int64(5, "number of padding bits")), "payload"),
}
return m, p.Err()
}
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