first commit of files

models/package.go

@@ -0,0 +1,29 @@
+package models
+
+import (
+	"bytes"
+	"encoding/binary"
+)
+
+// Art-Net constants
+const (
+	opCode     = 0x5000 // OpDmx (low byte first)
+	protocolID = "Art-Net\x00"
+)
+
+type Package []byte
+
+func NewArtNetPackage(data *DMX) Package {
+	// Build ArtDMX packet
+	packet := &bytes.Buffer{}
+	packet.WriteString(protocolID)                             // Art-Net ID
+	binary.Write(packet, binary.LittleEndian, uint16(opCode))  // OpCode (OpDmx)
+	packet.WriteByte(0x00)                                     // Protocol Version High
+	packet.WriteByte(14)                                       // Protocol Version Low (14 for Art-Net 4)
+	packet.WriteByte(0x00)                                     // Sequence
+	packet.WriteByte(0x00)                                     // Physical
+	binary.Write(packet, binary.BigEndian, uint16(0))          // Universe (net:subuni, usually 0)
+	binary.Write(packet, binary.BigEndian, uint16(len(*data))) // Length
+	packet.Write(*data)
+	return packet.Bytes()
+}