fixed multiple MIDI devices S/N

hardware/MIDIPeripheral.go

@@ -2,15 +2,17 @@ package hardware
 
 // MIDIPeripheral contains the data of a MIDI peripheral
 type MIDIPeripheral struct {
-	name       string // The name of the peripheral
-	location   int    // The location of the peripheral
+	name         string // The name of the peripheral
+	location     int    // The location of the peripheral
+	serialNumber string // The S/N of the peripheral
 }
 
 // NewMIDIPeripheral creates a new MIDI peripheral
-func NewMIDIPeripheral(name string, location int) *MIDIPeripheral {
+func NewMIDIPeripheral(name string, location int, serialNumber string) *MIDIPeripheral {
 	return &MIDIPeripheral{
-		name:       name,
-		location:   location,
+		name:         name,
+		location:     location,
+		serialNumber: serialNumber,
 	}
 }
 
@@ -44,5 +46,6 @@ func (p *MIDIPeripheral) GetInfo() PeripheralInfo {
 	return PeripheralInfo{
 		Name:         p.name,
 		ProtocolName: "MIDI",
+		SerialNumber: p.serialNumber,
 	}
 }