feat: Pulsar distribution service (Simulator → Pulsar → Brokers)

- Fix Pulsar: use binary client (port 6650) instead of non-existent REST /produce API
- Add pulsar-client to Dockerfile
- Create pulsar/distribution.py: consumes Pulsar and republishes to MQTT (EMQX/Mosquitto), NGSI-LD (Orion/Stellio), FROST
- Add docker-compose.distribution.yml for the distribution service
- Tested: Messages successfully distributed to EMQX and Orion-LD
- Update session resume

pulsar-to-brokers.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python3
+"""Pulsar Consumer → Republish to MQTT/FIWARE Brokers"""
+import pulsar, json, time, sys
+from datetime import datetime, timezone
+
+PULSAR_HOST = "smart-city-pulsar"
+TOPICS = ["persistent://public/default/smartcity-traffic",
+          "persistent://public/default/smartcity-airquality",
+          "persistent://public/default/smartcity-parking",
+          "persistent://public/default/smartcity-noise",
+          "persistent://public/default/smartcity-weather",
+          "persistent://public/default/smartcity-light"]
+
+def publish_mqtt(payload_dict):
+    """Publie sur EMQX (MQTT)"""
+    try:
+        import paho.mqtt.client as mqtt
+        client = mqtt.Client()
+        client.connect("emqx_emqx_1", 1883, 60)
+        topic = f"city/sensors/{payload_dict.get('type', 'unknown')}/{payload_dict.get('id', 'unknown')}"
+        client.publish(topic, json.dumps(payload_dict), qos=1)
+        client.disconnect()
+        return True
+    except Exception as e:
+        print(f"  ⚠️  MQTT → {e}")
+        return False
+
+def publish_ngsi_ld(payload_dict, broker_url, headers):
+    """Publie sur Orion-LD ou Stellio (NGSI-LD)"""
+    try:
+        import urllib.request
+        data = json.dumps(payload_dict).encode()
+        req = urllib.request.Request(broker_url, data=data, headers=headers, method="POST")
+        with urllib.request.urlopen(req, timeout=5) as resp:
+            return resp.status in (200, 201, 204)
+    except Exception as e:
+        print(f"  ⚠️  NGSI-LD → {e}")
+        return False
+
+def main():
+    client = pulsar.Client(f"pulsar://{PULSAR_HOST}:6650")
+    consumers = []
+    for topic in TOPICS:
+        cons = client.subscribe(topic, subscription_name="smartcity-distribution")
+        consumers.append((topic, cons))
+    print(f"[DISTRIB] ✅ Listening on {len(TOPICS)} topics...")
+    while True:
+        for topic, consumer in consumers:
+            try:
+                msg = consumer.receive(timeout_millis=1000)
+                data = json.loads(msg.data().decode())
+                print(f"[DISTRIB] {topic} → MQTT + NGSI-LD")
+                # Republish to MQTT
+                publish_mqtt(data)
+                # Republish to NGSI-LD (Orion-LD)
+                ngsi_payload = data  # Assume déjà formaté
+                publish_ngsi_ld(ngsi_payload, "http://fiware-gis-quickstart-orion-1:1026/ngsi-ld/v1/entities", {"Content-Type": "application/ld+json"})
+                consumer.acknowledge(msg)
+            except Exception:
+                pass
+        time.sleep(1)
+
+if __name__ == "__main__":
+    main()