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package nmea
const (
// TypeBBM type of BBM sentence for AIS broadcast binary message
TypeBBM = "BBM"
)
// BBM - AIS broadcast binary message
// https://fcc.report/FCC-ID/ADB9ZWRTR100/2768717.pdf (page 7) FURUNO MARINE RADAR, model FAR-15XX manual
//
// Format: !--BBM,x,x,x,x,xx,s—s,x*hh<CR><LF>
// Example: !AIBBM,26,2,1,3,8,177KQJ5000G?tO`K>RA1wUbN0TKH,0*2C
type BBM struct {
BaseSentence
// NumFragments is total number of fragments/sentences need to transfer the message (1 - 9)
NumFragments int64 // 0
// FragmentNumber is current fragment/sentence number (1 - 9)
FragmentNumber int64 // 1
// MessageID is sequential message identifier (0 - 9)
MessageID int64 // 2
// Channel is AIS channel for broadcast of the radio message (0 - 3)
// 0 - no broadcast
// 1 - on AIS channel A
// 2 - on AIS channel B
// 3 - broadcast on both AIS channels
Channel string // 3
// VDLMessageNumber is ITU-r M.1371 message number (8/14)
VDLMessageNumber int64 // 4
// Payload is encapsulated data (6 bit binary-converted data) (1 - 63 bytes)
Payload []byte // 5
// 6 - Number of fill bits (0 - 5)
}
// newBBM constructor
func newBBM(s BaseSentence) (Sentence, error) {
p := NewParser(s)
p.AssertType(TypeBBM)
m := BBM{
BaseSentence: s,
NumFragments: p.Int64(0, "number of fragments"),
FragmentNumber: p.Int64(1, "fragment number"),
MessageID: p.Int64(2, "message ID"),
Channel: p.String(3, "channel"),
VDLMessageNumber: p.Int64(4, "VDL message number"),
Payload: p.SixBitASCIIArmour(5, int(p.Int64(6, "number of padding bits")), "payload"),
}
return m, p.Err()
}
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