Configured customer broker

api-customer/app.py

@@ -1,5 +1,8 @@
 from flask import Flask
 
+from src.controllers.mqtt_forwarder import MQTTForwarder
+from src.services.mqtt_service import MQTTService
+
 app = Flask(__name__)
 
 
@@ -9,4 +12,10 @@ def hello_world():
 
 
 if __name__ == '__main__':
-    app.run()
+
+    local_broker = MQTTService("127.0.0.1", 1883)
+    api_broker = MQTTService("192.168.15.120", 8883)
+
+    forwarder = MQTTForwarder(local_broker, api_broker)
+
+    app.run(host="0.0.0.0", port=5000, debug=False)

api-customer/docker-compose.yml

@@ -3,11 +3,12 @@ version: "3.8"
 services:
   customer-api:
     build: .
-    container_name: "Flask-API"
+    container_name: "customer-api"
     ports:
       - "5000:5000"
     depends_on:
       - mongo
+      - mosquitto
     environment:
       - MONGO_URI=mongodb://mongo:27017/mydb
 
@@ -22,4 +23,17 @@ services:
       - "27017:27017"
     volumes:
       - ./mongo-data:/data/db
-      - ./mongo-init:/docker-entrypoint-initdb.d
+      - ./mongo-init:/docker-entrypoint-initdb.d
+
+  mosquitto:
+    image: eclipse-mosquitto:latest
+    container_name: "customer-broker"
+    ports:
+      - "1883:1883"
+      - "8883:8883"
+    volumes:
+      - ./mosquitto/config:/mosquitto/config
+      - ./mosquitto/data:/mosquitto/data
+      - ./mosquitto/log:/mosquitto/log
+      - ./mosquitto/certs:/mosquitto/certs
+

api-customer/mosquitto/certs/mosquitto.crt

@@ -0,0 +1,25 @@
+-----BEGIN CERTIFICATE-----
+MIIEMTCCAxmgAwIBAgIUSj7h3y4SaFxuD6AeIkuZytZf8uEwDQYJKoZIhvcNAQEL
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+Bxv7rANBb73Aw2g06OyHLq3Fc35k
+-----END CERTIFICATE-----

api-customer/mosquitto/certs/mosquitto.key

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDgRZbs1AKWZVds
+ytDagCRTtUrEasxzICMG8yTAz71dqZR2FXgEHVLTpVp6cFBRB3EeRxFdo1S8te0S
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+Bc8O+xK3JTWZ9ybWbohZH7E=
+-----END PRIVATE KEY-----

api-customer/mosquitto/config/mosquitto.conf

@@ -0,0 +1,16 @@
+persistence true
+persistence_location /mosquitto/data/
+
+log_dest file /mosquitto/log/mosquitto.log
+
+listener 1883
+
+allow_anonymous false
+password_file /mosquitto/config/passwords
+
+listener 8883
+protocol mqtt
+
+certfile /mosquitto/certs/mosquitto.crt
+keyfile /mosquitto/certs/mosquitto.key
+tls_version tlsv1.2

api-customer/requirements.txt

@@ -1 +1,2 @@
-flask
+flask
+paho-mqtt

api-customer/src/controllers/mqtt_forwarder.py

@@ -0,0 +1,43 @@
+import json
+import time
+
+from src.services.mqtt_service import MQTTService
+
+
+class MQTTForwarder:
+
+    client_id : str
+    local_broker : MQTTService
+    central_broker : MQTTService
+
+    def __init__(self, client_id : str, local_mqtt: MQTTService, central_mqtt: MQTTService):
+        self.client_id = client_id
+        self.local_broker = local_mqtt
+        self.central_broker = central_mqtt
+
+    def start(self):
+        self.local_broker.subscribe("board-mate/", self.__forward)
+
+    def __forward(self, msg: str):
+        self.central_broker.publish(self.client_id, f"/board-mate/${self.client_id}/telemetry", msg)
+
+    """def start(self):
+        self.local.subscribe("board-mate/+/telemetry", self.handle_message)
+
+    def handle_message(self, topic: str, payload: str):
+        print(f"[FORWARD] {topic} -> central")
+
+        message = json.loads(payload)
+        message["source"] = "client-server"
+        message["forwarded_at"] = int(time.time())
+
+        self.central.publish(
+            client_id="client-forwarder",
+            topic=f"clients/{self.extract_client_id(topic)}/telemetry",
+            data=json.dumps(message),
+            qos=1
+        )
+
+    def extract_client_id(self, topic: str) -> str:
+        # ex: board-mate/pi-123/telemetry
+        return topic.split("/")[1]"""

api-customer/src/services/mqtt_service.py

@@ -0,0 +1,55 @@
+import json
+import time
+from typing import Callable
+
+import paho.mqtt.client as mqtt
+from paho.mqtt.client import Client
+
+
+class MQTTService:
+
+    client : Client
+
+    def __init__(self, address: str, port: int):
+        self.address = address
+        self.port = port
+        self.client = mqtt.Client()
+
+    def publish(self, client_id: str, topic: str, data: str, qos: int = 0):
+
+        try:
+            self.__connect()
+
+            payload = {
+                "timestamp": int(time.time()),
+                "data": data
+            }
+            result = self.client.publish(topic, json.dumps(payload), qos=qos)
+            result.wait_for_publish()
+
+        except Exception as e:
+            print("MQTT error:", e)
+            self.__disconnect()
+
+    def subscribe(self, topic: str, handler: Callable[[str], None]):
+        def on_message(client, userdata, msg):
+            handler(msg.payload.decode())
+
+        try:
+            self.__connect()
+            self.client.message_callback_add(topic, on_message)
+            self.client.subscribe(topic)
+        except Exception as e:
+            print("MQTT error:", e)
+            self.__disconnect()
+
+
+    def __connect(self):
+        if not self.client.is_connected():
+            self.client.connect(self.address, self.port)
+            self.client.loop_start()
+
+    def __disconnect(self):
+        if self.client.is_connected():
+            self.client.disconnect()
+            self.client.loop_stop()