feat(controller): initial communication with mtp as microservices

agent/oktopus-mqtt-obuspa.txt

@@ -31,7 +31,7 @@ Device.LocalAgent.Subscription.1.NotifType Event
 Device.LocalAgent.Subscription.1.ReferenceList Device.Boot!
 Device.LocalAgent.Subscription.1.Persistent true
 
-Device.LocalAgent.MTP.1.MQTT.ResponseTopicConfigured "oktopus/v1/controller"
+Device.LocalAgent.MTP.1.MQTT.ResponseTopicConfigured "oktopus/usp/v1/controller"
 Device.LocalAgent.MTP.1.MQTT.Reference "Device.MQTT.Client.1"
 Device.MQTT.Client.1.BrokerAddress "localhost"
 Device.MQTT.Client.1.ProtocolVersion "5.0"
@@ -59,7 +59,7 @@ Device.LocalAgent.Controller.1.MTP.1.Enable true
 Device.LocalAgent.Controller.1.MTP.1.Protocol "MQTT"
 Device.LocalAgent.Controller.1.EndpointID "oktopusController"
 Device.LocalAgent.Controller.1.MTP.1.MQTT.Reference "Device.MQTT.Client.1"
-Device.LocalAgent.Controller.1.MTP.1.MQTT.Topic "oktopus/v1/controller"
+Device.LocalAgent.Controller.1.MTP.1.MQTT.Topic "oktopus/usp/v1/controller"
 
 
 

backend/services/controller/internal/api/api.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/gorilla/mux"
 	"github.com/leandrofars/oktopus/internal/api/cors"
+	"github.com/leandrofars/oktopus/internal/api/middleware"
 	"github.com/leandrofars/oktopus/internal/bridge"
 	"github.com/leandrofars/oktopus/internal/config"
 	"github.com/leandrofars/oktopus/internal/db"
@@ -44,19 +45,19 @@ func NewApi(c config.RestApi, js jetstream.JetStream, nc *nats.Conn, bridge brid
 
 func (a *Api) StartApi() {
 	r := mux.NewRouter()
-	// authentication := r.PathPrefix("/api/auth").Subrouter()
+	authentication := r.PathPrefix("/api/auth").Subrouter()
-	// authentication.HandleFunc("/login", a.generateToken).Methods("PUT")
+	authentication.HandleFunc("/login", a.generateToken).Methods("PUT")
-	// authentication.HandleFunc("/register", a.registerUser).Methods("POST")
+	authentication.HandleFunc("/register", a.registerUser).Methods("POST")
-	// authentication.HandleFunc("/admin/register", a.registerAdminUser).Methods("POST")
+	authentication.HandleFunc("/admin/register", a.registerAdminUser).Methods("POST")
-	// authentication.HandleFunc("/admin/exists", a.adminUserExists).Methods("GET")
+	authentication.HandleFunc("/admin/exists", a.adminUserExists).Methods("GET")
-	// iot := r.PathPrefix("/api/device").Subrouter()
+	iot := r.PathPrefix("/api/device").Subrouter()
 	// iot.HandleFunc("", a.retrieveDevices).Methods("GET")
 	// iot.HandleFunc("/{id}", a.retrieveDevices).Methods("GET")
 	// iot.HandleFunc("/{sn}/get", a.deviceGetMsg).Methods("PUT")
 	// iot.HandleFunc("/{sn}/add", a.deviceCreateMsg).Methods("PUT")
 	// iot.HandleFunc("/{sn}/del", a.deviceDeleteMsg).Methods("PUT")
 	// iot.HandleFunc("/{sn}/set", a.deviceUpdateMsg).Methods("PUT")
-	// iot.HandleFunc("/{sn}/parameters", a.deviceGetSupportedParametersMsg).Methods("PUT")
+	iot.HandleFunc("/{sn}/parameters", a.deviceGetSupportedParametersMsg).Methods("PUT")
 	// iot.HandleFunc("/{sn}/instances", a.deviceGetParameterInstances).Methods("PUT")
 	// iot.HandleFunc("/{sn}/operate", a.deviceOperateMsg).Methods("PUT")
 	// iot.HandleFunc("/{sn}/fw_update", a.deviceFwUpdate).Methods("PUT")
@@ -72,9 +73,9 @@ func (a *Api) StartApi() {
 	users.HandleFunc("", a.retrieveUsers).Methods("GET")
 
 	/* ----- Middleware for requests which requires user to be authenticated ---- */
-	// iot.Use(func(handler http.Handler) http.Handler {
+	iot.Use(func(handler http.Handler) http.Handler {
-	// 	return middleware.Middleware(handler)
+		return middleware.Middleware(handler)
-	// })
+	})
 
 	// mtp.Use(func(handler http.Handler) http.Handler {
 	// 	return middleware.Middleware(handler)

backend/services/controller/internal/api/device.go

@@ -0,0 +1,312 @@
+package api
+
+import (
+	"net/http"
+
+	"github.com/gorilla/mux"
+	"github.com/leandrofars/oktopus/internal/bridge"
+	"github.com/leandrofars/oktopus/internal/entity"
+	local "github.com/leandrofars/oktopus/internal/nats"
+	"github.com/leandrofars/oktopus/internal/usp/usp_msg"
+	"github.com/leandrofars/oktopus/internal/usp/usp_record"
+	"github.com/leandrofars/oktopus/internal/usp/usp_utils"
+	"github.com/leandrofars/oktopus/internal/utils"
+	"google.golang.org/protobuf/proto"
+)
+
+func (a *Api) deviceGetSupportedParametersMsg(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	sn := vars["sn"]
+
+	device, err := bridge.NatsReq[entity.Device](
+		local.NATS_ADAPTER_SUBJECT+sn+".device",
+		[]byte(""),
+		w,
+		a.nc,
+	)
+	if err != nil {
+		return
+	}
+
+	if device.Msg.Status != entity.Online {
+		w.WriteHeader(http.StatusServiceUnavailable)
+		w.Write(utils.Marshall("Device is offline"))
+		return
+	}
+
+	var getSupportedDM usp_msg.GetSupportedDM
+	utils.MarshallDecoder(&getSupportedDM, r.Body)
+	msg := usp_utils.NewGetSupportedParametersMsg(getSupportedDM)
+	protoMsg, err := proto.Marshal(&msg)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write(utils.Marshall(err.Error()))
+		return
+	}
+	record := usp_utils.NewUspRecord(protoMsg, sn)
+	protoRecord, err := proto.Marshal(&record)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write(utils.Marshall(err.Error()))
+		return
+	}
+
+	data, err := bridge.NatsUspInteraction(
+		local.NATS_MQTT_SUBJECT_PREFIX+sn+".api",
+		local.NATS_MQTT_ADAPTER_SUBJECT_PREFIX+sn+".api",
+		protoRecord,
+		w,
+		a.nc,
+	)
+	if err != nil {
+		return
+	}
+
+	var receivedRecord usp_record.Record
+	err = proto.Unmarshal(data, &receivedRecord)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write(utils.Marshall(err.Error()))
+		return
+	}
+	var receivedMsg usp_msg.Msg
+	err = proto.Unmarshal(receivedRecord.GetNoSessionContext().Payload, &receivedMsg)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write(utils.Marshall(err.Error()))
+		return
+	}
+	body := receivedMsg.Body.GetResponse()
+	utils.MarshallEncoder(body.GetGetSupportedDmResp(), w)
+}
+
+// func (a *Api) retrieveDevices(w http.ResponseWriter, r *http.Request) {
+// 	const PAGE_SIZE_LIMIT = 50
+// 	const PAGE_SIZE_DEFAULT = 20
+
+// 	// Get specific device
+// 	id := r.URL.Query().Get("id")
+// 	if id != "" {
+// 		device, err := a.Db.RetrieveDevice(id)
+// 		if err != nil {
+// 			if err == mongo.ErrNoDocuments {
+// 				json.NewEncoder(w).Encode("Device id: " + id + " not found")
+// 				return
+// 			}
+// 			json.NewEncoder(w).Encode(err)
+// 			w.WriteHeader(http.StatusInternalServerError)
+// 			return
+// 		}
+// 		err = json.NewEncoder(w).Encode(device)
+// 		if err != nil {
+// 			log.Println(err)
+// 		}
+// 		return
+// 	}
+
+// 	// Get devices with pagination
+// 	page_n := r.URL.Query().Get("page_number")
+// 	page_s := r.URL.Query().Get("page_size")
+// 	var err error
+
+// 	var page_number int64
+// 	if page_n == "" {
+// 		page_number = 0
+// 	} else {
+// 		page_number, err = strconv.ParseInt(page_n, 10, 64)
+// 		if err != nil {
+// 			w.WriteHeader(http.StatusBadRequest)
+// 			json.NewEncoder(w).Encode("Page number must be an integer")
+// 			return
+// 		}
+// 	}
+
+// 	var page_size int64
+// 	if page_s != "" {
+// 		page_size, err = strconv.ParseInt(page_s, 10, 64)
+
+// 		if err != nil {
+// 			w.WriteHeader(http.StatusBadRequest)
+// 			json.NewEncoder(w).Encode("Page size must be an integer")
+// 			return
+// 		}
+
+// 		if page_size > PAGE_SIZE_LIMIT {
+// 			w.WriteHeader(http.StatusBadRequest)
+// 			json.NewEncoder(w).Encode("Page size must not exceed " + strconv.Itoa(PAGE_SIZE_LIMIT))
+// 			return
+// 		}
+
+// 	} else {
+// 		page_size = PAGE_SIZE_DEFAULT
+// 	}
+
+// 	total, err := a.Db.RetrieveDevicesCount(bson.M{})
+// 	if err != nil {
+// 		w.WriteHeader(http.StatusInternalServerError)
+// 		json.NewEncoder(w).Encode("Unable to get devices count from database")
+// 		return
+// 	}
+
+// 	skip := page_number * (page_size - 1)
+// 	if total < page_size {
+// 		skip = 0
+// 	}
+
+// 	//TODO: Create filters
+// 	//TODO: Create sorting
+
+// 	sort := bson.M{}
+// 	sort["status"] = 1
+
+// 	filter := bson.A{
+// 		//bson.M{"$match": filter},
+// 		bson.M{"$sort": sort}, // shows online devices first
+// 		bson.M{"$skip": skip},
+// 		bson.M{"$limit": page_size},
+// 	}
+
+// 	devices, err := a.Db.RetrieveDevices(filter)
+// 	if err != nil {
+// 		w.WriteHeader(http.StatusInternalServerError)
+// 		json.NewEncoder(w).Encode("Unable to aggregate database devices info")
+// 		return
+// 	}
+
+// 	err = json.NewEncoder(w).Encode(map[string]interface{}{
+// 		"pages":   total / page_size,
+// 		"page":    page_number,
+// 		"size":    page_size,
+// 		"devices": devices,
+// 	})
+// 	if err != nil {
+// 		log.Println(err)
+// 	}
+// }
+
+// func (a *Api) deviceCreateMsg(w http.ResponseWriter, r *http.Request) {
+// 	vars := mux.Vars(r)
+// 	sn := vars["sn"]
+// 	device := a.deviceExists(sn, w)
+
+// 	var receiver usp_msg.Add
+
+// 	err := json.NewDecoder(r.Body).Decode(&receiver)
+// 	if err != nil {
+// 		log.Println(err)
+// 		w.WriteHeader(http.StatusBadRequest)
+// 		return
+// 	}
+
+// 	msg := utils.NewCreateMsg(receiver)
+// 	a.uspCall(msg, sn, w, device)
+// }
+
+// func (a *Api) deviceGetMsg(w http.ResponseWriter, r *http.Request) {
+// 	vars := mux.Vars(r)
+// 	sn := vars["sn"]
+
+// 	device := a.deviceExists(sn, w)
+
+// 	var receiver usp_msg.Get
+
+// 	err := json.NewDecoder(r.Body).Decode(&receiver)
+// 	if err != nil {
+// 		log.Println(err)
+// 		w.WriteHeader(http.StatusBadRequest)
+// 		return
+// 	}
+
+// 	msg := utils.NewGetMsg(receiver)
+// 	a.uspCall(msg, sn, w, device)
+// }
+
+// func (a *Api) deviceOperateMsg(w http.ResponseWriter, r *http.Request) {
+// 	vars := mux.Vars(r)
+// 	sn := vars["sn"]
+
+// 	device := a.deviceExists(sn, w)
+
+// 	var receiver usp_msg.Operate
+
+// 	err := json.NewDecoder(r.Body).Decode(&receiver)
+// 	if err != nil {
+// 		log.Println(err)
+// 		w.WriteHeader(http.StatusBadRequest)
+// 		return
+// 	}
+
+// 	msg := utils.NewOperateMsg(receiver)
+// 	a.uspCall(msg, sn, w, device)
+// }
+
+// func (a *Api) deviceDeleteMsg(w http.ResponseWriter, r *http.Request) {
+// 	vars := mux.Vars(r)
+// 	sn := vars["sn"]
+// 	device := a.deviceExists(sn, w)
+
+// 	var receiver usp_msg.Delete
+
+// 	err := json.NewDecoder(r.Body).Decode(&receiver)
+// 	if err != nil {
+// 		log.Println(err)
+// 		w.WriteHeader(http.StatusBadRequest)
+// 		return
+// 	}
+
+// 	msg := utils.NewDelMsg(receiver)
+// 	a.uspCall(msg, sn, w, device)
+
+// 	//a.Broker.Request(tr369Message, usp_msg.Header_GET, "oktopus/v1/agent/"+sn, "oktopus/v1/get/"+sn)
+
+// }
+
+// func (a *Api) deviceUpdateMsg(w http.ResponseWriter, r *http.Request) {
+// 	vars := mux.Vars(r)
+// 	sn := vars["sn"]
+// 	device := a.deviceExists(sn, w)
+
+// 	var receiver usp_msg.Set
+
+// 	err := json.NewDecoder(r.Body).Decode(&receiver)
+// 	if err != nil {
+// 		log.Println(err)
+// 		w.WriteHeader(http.StatusBadRequest)
+// 		return
+// 	}
+
+// 	msg := utils.NewSetMsg(receiver)
+// 	a.uspCall(msg, sn, w, device)
+// }
+
+// // TODO: react this function, return err and deal with it in the caller, remove header superfluos
+// func (a *Api) deviceExists(sn string, w http.ResponseWriter) db.Device {
+// 	device, err := a.Db.RetrieveDevice(sn)
+// 	if err != nil {
+// 		if err == mongo.ErrNoDocuments {
+// 			w.WriteHeader(http.StatusBadRequest)
+// 			json.NewEncoder(w).Encode("No device with serial number " + sn + " was found")
+// 		}
+// 		w.WriteHeader(http.StatusInternalServerError)
+// 		return device
+// 	}
+// 	return device
+// }
+
+// func (a *Api) deviceGetParameterInstances(w http.ResponseWriter, r *http.Request) {
+// 	vars := mux.Vars(r)
+// 	sn := vars["sn"]
+// 	device := a.deviceExists(sn, w)
+
+// 	var receiver usp_msg.GetInstances
+
+// 	err := json.NewDecoder(r.Body).Decode(&receiver)
+// 	if err != nil {
+// 		log.Println(err)
+// 		w.WriteHeader(http.StatusBadRequest)
+// 		return
+// 	}
+
+// 	msg := utils.NewGetParametersInstancesMsg(receiver)
+// 	a.uspCall(msg, sn, w, device)
+// }

backend/services/controller/internal/bridge/bridge.go

@@ -2,18 +2,20 @@ package bridge
 
 import (
 	"encoding/json"
+	"errors"
 	"log"
 	"net/http"
+	"time"
 
+	"github.com/leandrofars/oktopus/internal/entity"
 	local "github.com/leandrofars/oktopus/internal/nats"
 	"github.com/leandrofars/oktopus/internal/utils"
 	"github.com/nats-io/nats.go"
 	"github.com/nats-io/nats.go/jetstream"
 )
 
-type DataType interface {
+var errNatsMsgReceivedWithErrorData = errors.New("Nats message received with error data")
-	[]map[string]interface{}
+var errNatsRequestTimeout = errors.New("Nats message response timeout")
-}
 
 type Bridge struct {
 	js jetstream.JetStream
@@ -27,29 +29,141 @@ func NewBridge(js jetstream.JetStream, nc *nats.Conn) Bridge {
 	}
 }
 
-func NatsReq[T DataType](
+func NatsUspInteraction(
+	subSubj, pubSubj string,
+	body []byte,
+	w http.ResponseWriter,
+	nc *nats.Conn,
+) ([]byte, error) {
+
+	var answer []byte
+
+	ch := make(chan *nats.Msg, 64)
+	done := make(chan error)
+	_, err := nc.ChanSubscribe(subSubj, ch)
+	if err != nil {
+		log.Println(err)
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write(utils.Marshall("Error to communicate with nats: " + err.Error()))
+		return []byte{}, err
+	}
+
+	go func() {
+		select {
+		case msg := <-ch:
+			log.Println("Received an usp message response")
+			answer = msg.Data
+			done <- nil
+		case <-time.After(local.NATS_REQUEST_TIMEOUT):
+			log.Println("usp message response timeout")
+			w.WriteHeader(http.StatusGatewayTimeout)
+			w.Write(utils.Marshall("usp message response timeout"))
+			done <- errNatsRequestTimeout
+		}
+	}()
+
+	err = nc.Publish(pubSubj, body)
+	if err != nil {
+		log.Println(err)
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write(utils.Marshall("Error to communicate with nats: " + err.Error()))
+		return nil, err
+	}
+
+	err = <-done
+
+	return answer, err
+}
+
+func NatsCustomReq[T entity.DataType](
+	subSubj, pubSubj string,
+	body []byte,
+	w http.ResponseWriter,
+	nc *nats.Conn,
+) (interface{}, error) {
+
+	var answer T
+
+	ch := make(chan *nats.Msg, 64)
+	done := make(chan string)
+	_, err := nc.ChanSubscribe(subSubj, ch)
+	if err != nil {
+		log.Println(err)
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write(utils.Marshall("Error to communicate with nats: " + err.Error()))
+		return nil, err
+	}
+
+	select {
+	case msg := <-ch:
+		log.Println("Received an api message response")
+		err = json.Unmarshal(msg.Data, &answer)
+		if err != nil {
+			log.Println(err)
+			w.WriteHeader(http.StatusInternalServerError)
+			w.Write(msg.Data)
+			return nil, err
+		}
+		done <- "done"
+	case <-time.After(local.NATS_REQUEST_TIMEOUT):
+		log.Println("Api message response timeout")
+		done <- "timeout"
+	}
+
+	err = nc.Publish(pubSubj, body)
+	if err != nil {
+		log.Println(err)
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write(utils.Marshall("Error to communicate with nats: " + err.Error()))
+		return nil, err
+	}
+
+	<-done
+
+	return nil, nil
+}
+
+/*
+- makes a request to nats topic
+
+- handle nats communication
+
+- verify if received data is of error type
+*/
+func NatsReq[T entity.DataType](
 	subj string,
 	body []byte,
 	w http.ResponseWriter,
 	nc *nats.Conn,
-) (T, error) {
+) (*entity.MsgAnswer[T], error) {
 
-	var answer T
+	var answer *entity.MsgAnswer[T]
 
 	msg, err := nc.Request(subj, body, local.NATS_REQUEST_TIMEOUT)
 	if err != nil {
 		log.Println(err)
-		w.Write(utils.Marshall("Error to communicate with nats: " + err.Error()))
 		w.WriteHeader(http.StatusInternalServerError)
+		w.Write(utils.Marshall("Error to communicate with nats: " + err.Error()))
 		return nil, err
 	}
 
 	err = json.Unmarshal(msg.Data, &answer)
 	if err != nil {
-		log.Println(err)
+
-		w.Write(msg.Data)
+		var errMsg *entity.MsgAnswer[*string]
-		w.WriteHeader(http.StatusInternalServerError)
+		err = json.Unmarshal(msg.Data, &errMsg)
-		return nil, err
+
+		if err != nil {
+			log.Println("Bad answer message formatting: ", err.Error())
+			w.WriteHeader(http.StatusInternalServerError)
+			w.Write(msg.Data)
+			return nil, err
+		}
+
+		log.Printf("Error message received, msg: %s, code: %d", *errMsg.Msg, errMsg.Code)
+		w.WriteHeader(errMsg.Code)
+		w.Write(utils.Marshall(*errMsg.Msg))
+		return nil, errNatsMsgReceivedWithErrorData
 	}
 
 	return answer, nil

backend/services/controller/internal/entity/device.go

@@ -0,0 +1,14 @@
+package entity
+
+type Device struct {
+	SN           string
+	Model        string
+	Customer     string
+	Vendor       string
+	Version      string
+	ProductClass string
+	Status       Status
+	Mqtt         Status
+	Stomp        Status
+	Websockets   Status
+}

backend/services/controller/internal/entity/msg.go

@@ -0,0 +1,10 @@
+package entity
+
+type DataType interface {
+	[]map[string]interface{} | *string | Device
+}
+
+type MsgAnswer[T DataType] struct {
+	Code int
+	Msg  T
+}

backend/services/controller/internal/entity/status.go

@@ -0,0 +1,9 @@
+package entity
+
+type Status uint8
+
+const (
+	Offline Status = iota
+	Associating
+	Online
+)

backend/services/controller/internal/entity/usp.go

@@ -0,0 +1,7 @@
+package entity
+
+import "github.com/leandrofars/oktopus/internal/usp/usp_msg"
+
+type UspType interface {
+	usp_msg.GetSupportedDM
+}

backend/services/controller/internal/nats/nats.go

@@ -10,8 +10,11 @@ import (
 )
 
 const (
-	NATS_ACCOUNT_SUBJ_PREFIX = "account-manager.v1."
+	NATS_ACCOUNT_SUBJ_PREFIX         = "account-manager.v1."
-	NATS_REQUEST_TIMEOUT     = 5 * time.Second
+	NATS_REQUEST_TIMEOUT             = 5 * time.Second
+	NATS_MQTT_SUBJECT_PREFIX         = "mqtt.usp.v1."
+	NATS_MQTT_ADAPTER_SUBJECT_PREFIX = "mqtt-adapter.usp.v1."
+	NATS_ADAPTER_SUBJECT             = "adapter.usp.v1."
 )
 
 func StartNatsClient(c config.Nats) (jetstream.JetStream, *nats.Conn) {

backend/services/controller/internal/utils/utils.go

@@ -2,6 +2,7 @@ package utils
 
 import (
 	"encoding/json"
+	"io"
 	"log"
 )
 
@@ -13,3 +14,17 @@ func Marshall(data any) []byte {
 	}
 	return fmtData
 }
+
+func MarshallEncoder(data any, w io.Writer) {
+	err := json.NewEncoder(w).Encode(data)
+	if err != nil {
+		log.Printf("Error to encode message into json: %q", err)
+	}
+}
+
+func MarshallDecoder(data any, r io.Reader) {
+	err := json.NewDecoder(r).Decode(data)
+	if err != nil {
+		log.Printf("Error to decode message into json: %q", err)
+	}
+}

backend/services/controller/run.sh

@@ -1 +0,0 @@
-go run cmd/oktopus/main.go -u root -P root -mongo mongodb://172.16.238.3:27017/

backend/services/mtp/adapter/internal/db/db.go

@@ -37,6 +37,7 @@ func NewDatabase(ctx context.Context, mongoUri string) Database {
 
 	devices := client.Database("adapter").Collection("devices")
 	createIndexes(ctx, devices)
+	resetDeviceStatus(ctx, devices)
 
 	db.devices = devices
 	db.ctx = ctx
@@ -45,6 +46,22 @@ func NewDatabase(ctx context.Context, mongoUri string) Database {
 	return db
 }
 
+func resetDeviceStatus(ctx context.Context, devices *mongo.Collection) {
+	_, err := devices.UpdateMany(ctx, bson.D{{}}, bson.D{
+		{
+			"$set", bson.D{
+				{"mqtt", 0},
+				{"stomp", 0},
+				{"websockets", 0},
+				{"status", 0},
+			},
+		},
+	})
+	if err != nil {
+		log.Fatalln("ERROR to reset device status in database:", err)
+	}
+}
+
 func createIndexes(ctx context.Context, devices *mongo.Collection) {
 	indexField := bson.M{"sn": 1}
 	_, err := devices.Indexes().CreateOne(ctx, mongo.IndexModel{

backend/services/mtp/adapter/internal/reqs/reqs.go

@@ -28,8 +28,7 @@ func StartRequestsListener(ctx context.Context, nc *nats.Conn, db db.Database) {
 
 		deviceInfo, err := db.RetrieveDevice(device)
 		if deviceInfo.SN != "" {
-			body, _ := json.Marshal(deviceInfo)
+			respondMsg(msg.Respond, 200, deviceInfo)
-			respondMsg(msg.Respond, 200, body)
 		} else {
 			if err != nil {
 				if err == mongo.ErrNoDocuments {

backend/services/mtp/mqtt-adapter/internal/bridge/bridge.go

@@ -101,6 +101,21 @@ func (b *Bridge) natsMessageHandler(cm *autopaho.ConnectionManager) {
 				ResponseTopic: "oktopus/usp/v1/controller/" + getDeviceFromSubject(m.Subject),
 			},
 		})
+
+	})
+
+	b.Sub(NATS_MQTT_ADAPTER_SUBJECT_PREFIX+"api", func(m *nats.Msg) {
+
+		log.Printf("Received message on api subject")
+		cm.Publish(b.Ctx, &paho.Publish{
+			QoS:     byte(b.Mqtt.Qos),
+			Topic:   MQTT_TOPIC_PREFIX + "v1/agent/" + getDeviceFromSubject(m.Subject),
+			Payload: m.Data,
+			Properties: &paho.PublishProperties{
+				ResponseTopic: "oktopus/usp/v1/api/" + getDeviceFromSubject(m.Subject),
+			},
+		})
+
 	})
 }