Extract data from mqtt json payload

models/mo.go

@@ -0,0 +1,17 @@
+package models
+
+type Mo struct {
+	ID MoID `json:"id"`
+	MO MoMO `json:"mo"`
+}
+
+type MoID struct {
+	PTU4_MAC string
+	PTU4_SN  string
+}
+
+type MoMO struct {
+	Action      string `json:"action"`
+	Description string `json:"description"`
+	Number      string `json:"number"`
+}

mqtt/mqtt.go

@@ -2,19 +2,20 @@ package mqtt
 
 import (
 	"crypto/tls"
-	//"crypto/x509"
 	"fmt"
 	"log"
 	"net/url"
 	"strconv"
 	"strings"
 
-	MQTT "github.com/eclipse/paho.mqtt.golang"
-	//"os"
 	"mqttListener/Config"
 	"mqttListener/models"
 	"regexp"
 	"time"
+
+	MQTT "github.com/eclipse/paho.mqtt.golang"
+
+	"encoding/json"
 )
 
 /*
@@ -126,6 +127,8 @@ var subscriptionHandler = func(client MQTT.Client, msg MQTT.Message) {
 	fmt.Printf("MSG: \n%s\n", msg.Payload())
 	//fmt.Printf("* [%s] %s\n", msg.Topic(), string(msg.Payload()))
 
+	//-------------------------------------------------------------------
+	// create ID from topic
 	regexpWithType := "\\/ATB\\/[A-Z]+\\/[0-9]+\\/[0-9]+\\/mo"
 	regexpDefault := "\\/ATB\\/[0-9]+\\/[0-9]+\\/[0-9]+\\/[0-9]+\\/mo"
 
@@ -160,5 +163,21 @@ var subscriptionHandler = func(client MQTT.Client, msg MQTT.Message) {
 	device.SN = "t.b.d."
 	device.LastMsg = "t.b.d"
 
+	//-------------------------------------------------------------------
+	// extract data from payload
+	bytes := []byte(msg.Payload())
+	mo := models.Mo{}
+	err = json.Unmarshal(bytes, &mo)
+	if err != nil {
+		fmt.Println(err.Error())
+		return
+	}
+
+	device.MAC = mo.ID.PTU4_MAC
+	device.SN = mo.ID.PTU4_SN
+
+	fmt.Printf("Device MAC = %s\n", device.MAC)
+	fmt.Printf("Device SN  = %s\n", device.SN)
+
 	// TODO: store this device in database
 }