Refactoring.

api/modem/gpio/gpio.go

@@ -0,0 +1,64 @@
+package gpio
+
+import (
+	"io"
+	"log"
+	"time"
+
+	gpio "github.com/stianeikeland/go-rpio/v4"
+)
+
+type gpioPin struct {
+	logger *log.Logger
+	pin    gpio.Pin
+}
+
+type Pin interface {
+	Init() error
+	PowerOn()
+	PowerOff()
+	io.Closer
+}
+
+func New(logger *log.Logger, pin uint8) Pin {
+	return gpioPin{
+		logger: logger,
+		pin:    gpio.Pin(pin),
+	}
+}
+
+func (p gpioPin) Init() error {
+	return gpio.Open()
+}
+
+func (p gpioPin) sendOnOffSignal() {
+	p.pin.Output()
+	p.logger.Println("Power on 0/3 + 100ms")
+	p.pin.Low()
+	p.pin.Toggle()
+	time.Sleep(100 * time.Millisecond)
+
+	p.logger.Println("Power on 1/3 + 3s")
+	p.pin.High()
+	p.pin.Toggle()
+	time.Sleep(3 * time.Second)
+
+	p.logger.Println("Power on 2/3 + 30s")
+	p.pin.Low()
+	p.pin.Toggle()
+	time.Sleep(30 * time.Second)
+
+	p.logger.Println("Power on 3/3")
+}
+
+func (p gpioPin) PowerOn() {
+	p.sendOnOffSignal()
+}
+
+func (p gpioPin) PowerOff() {
+	p.sendOnOffSignal()
+}
+
+func (p gpioPin) Close() error {
+	return gpio.Close()
+}