add some extended fields for poll

poll.go

@@ -14,6 +14,10 @@ type ArtPoll struct {
 	Flags        uint8
 	DiagPriority uint8
 	// TODO(jwetzell): support extended poll fields
+	TargetPortAddressTop    uint16
+	TargetPortAddressBottom uint16
+	EstaMan                 uint16
+	Oem                     uint16
 }
 
 func (ap *ArtPoll) GetOpCode() uint16 {
@@ -47,16 +51,33 @@ func (ap *ArtPoll) UnmarshalBinary(data []byte) error {
 	offset := 12
 	ap.Flags = data[offset]
 	ap.DiagPriority = data[offset+1]
+
+	if len(data) >= 16 {
+		ap.TargetPortAddressTop = binary.BigEndian.Uint16(data[14:16])
+	}
+	if len(data) >= 18 {
+		ap.TargetPortAddressBottom = binary.BigEndian.Uint16(data[16:18])
+	}
+	if len(data) >= 20 {
+		ap.EstaMan = binary.BigEndian.Uint16(data[18:20])
+	}
+	if len(data) >= 22 {
+		ap.Oem = binary.BigEndian.Uint16(data[20:22])
+	}
 	return nil
 }
 
 func (ap *ArtPoll) MarshalBinary() ([]byte, error) {
-	data := make([]byte, 8+6)
+	data := make([]byte, 8+14)
 	copy(data[0:8], ap.ID[:])
 	binary.LittleEndian.PutUint16(data[8:10], ap.OpCode)
 	data[10] = ap.ProtVerHi
 	data[11] = ap.ProtVerLo
 	data[12] = ap.Flags
 	data[13] = ap.DiagPriority
+	binary.BigEndian.PutUint16(data[14:16], ap.TargetPortAddressTop)
+	binary.BigEndian.PutUint16(data[16:18], ap.TargetPortAddressBottom)
+	binary.BigEndian.PutUint16(data[18:20], ap.EstaMan)
+	binary.BigEndian.PutUint16(data[20:22], ap.Oem)
 	return data, nil
 }