feat: add PINGREQ <-> PINGRESP

mqtt/handler/pingreq_handler.go

@@ -0,0 +1,21 @@
+package handler
+
+import (
+	"fmt"
+
+	"github.com/bati11/oreno-mqtt/mqtt/packet"
+)
+
+func HandlePingreq(reader *packet.MQTTReader) (*packet.Pingresp, error) {
+	fmt.Printf("  HandlePingreq\n")
+	pingreq, err := reader.ReadPingreq()
+	if err != nil {
+		return nil, err
+	}
+	fmt.Printf("  %+v\n", pingreq)
+	pingresp := packet.NewPingresp()
+	fmt.Printf("  ---\n")
+	fmt.Printf("  %+v\n", pingresp)
+	fmt.Printf("  %+v\n", pingresp.ToBytes())
+	return &pingresp, nil
+}

mqtt/packet/pingreq.go

@@ -0,0 +1,13 @@
+package packet
+
+type Pingreq struct {
+	FixedHeader *FixedHeader
+}
+
+func (reader *MQTTReader) ReadPingreq() (*Pingreq, error) {
+	fixedHeader, err := reader.readFixedHeader()
+	if err != nil {
+		return nil, err
+	}
+	return &Pingreq{fixedHeader}, nil
+}

mqtt/packet/pingresp.go

@@ -0,0 +1,19 @@
+package packet
+
+type Pingresp struct {
+	FixedHeader
+}
+
+func NewPingresp() Pingresp {
+	fixedHeader := FixedHeader{
+		PacketType:      PINGRESP,
+		RemainingLength: 0,
+	}
+	return Pingresp{fixedHeader}
+}
+
+func (p *Pingresp) ToBytes() []byte {
+	var result []byte
+	result = append(result, p.FixedHeader.ToBytes()...)
+	return result
+}

mqtt/server.go

@@ -68,6 +68,15 @@ func handle(conn net.Conn) error {
 			if err != nil {
 				return err
 			}
+		case packet.PINGREQ:
+			pingresp, err := handler.HandlePingreq(mqttReader)
+			if err != nil {
+				return err
+			}
+			_, err = conn.Write(pingresp.ToBytes())
+			if err != nil {
+				return err
+			}
 		case packet.DISCONNECT:
 			return nil
 		}