added EMQX for MQTT protocol support

docker-compose.yaml

@@ -134,6 +134,31 @@ services:
       - snoopBack
       - proxy
 
+  # NEW: EMQX MQTT broker
+  emqx:
+    image: emqx/emqx:latest # EMQX 5.x
+    restart: unless-stopped
+    environment:
+      # set a fixed node name (nice when you later add clustering)
+      EMQX_NODE__NAME: emqx@node1
+      # set dashboard admin user/pass (change these in prod!)
+      EMQX_DASHBOARD__DEFAULT_USERNAME: admin
+      EMQX_DASHBOARD__DEFAULT_PASSWORD: changeme123
+      # optional: enable WebSocket listener on 8083 (on by default in 5.x)
+      # EMQX_LISTENERS__WS__DEFAULT__ENABLE: "true"
+    volumes:
+      - emqx-data:/opt/emqx/data
+      - emqx-log:/opt/emqx/log
+    ports:
+      - "1883:1883"    # MQTT (TCP)
+      - "8083:8083"    # MQTT over WebSocket (WS)
+      # - "8883:8883"  # MQTT over TLS (uncomment when you add certs)
+      # - "8084:8084"  # WSS (uncomment with TLS)
+      - "18083:18083"  # Dashboard
+    networks:
+      - snoopBack
+      - proxy   # so Nginx can reverse-proxy WS at /mqtt/ws
+
 volumes:
   pgdata:
   miniodata: