From 6271aaff667e081df5f9162861748346e5d4c7cd Mon Sep 17 00:00:00 2001
From: Franco Carbognani <fcarbogn@gmail.com>
Date: Sat, 24 Aug 2024 14:47:45 +0200
Subject: [PATCH] Create mqttproxy.py

---
 src/simoc_sam/mqttproxy.py | 60 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 src/simoc_sam/mqttproxy.py

diff --git a/src/simoc_sam/mqttproxy.py b/src/simoc_sam/mqttproxy.py
new file mode 100644
index 00000000..f20cb483
--- /dev/null
+++ b/src/simoc_sam/mqttproxy.py
@@ -0,0 +1,60 @@
+#!/usr/bin/env python
+import paho.mqtt.client as mqtt
+
+KEEPALIVE = 10  # in seconds
+TOPIC = "sam/#"
+
+LOCAL_BROKER ='localhost'
+LOCAL_PORT = 1883
+
+REMOTE_BROKER ='mqtt.simoc.space' # this must match the CNAME in your server-cert!
+REMOTE_PORT = 8883
+
+# Callback when the client connects to the broker
+def on_local_connect(local_client, userdata, flags, rc, properties=None):
+    print(f'Locally connected with result code {rc}')
+    # Subscribe to the MQTT topic
+    local_client.subscribe(TOPIC)
+
+def on_message(client, userdata, msg):
+    payload = msg.payload.decode("utf-8")
+    topic = msg.topic
+    print(f"Received message: {payload}")
+    print(f"from topic: {topic}")
+    forward_message(topic, payload)
+
+# Function to forward the message to the remote broker
+def forward_message(topic, payload):
+    remote_client.publish(topic, payload)
+    print(f"Message forwarded to remote broker: {topic} -> {payload}")
+
+# Create an MQTT client
+local_client = mqtt.Client()
+remote_client = mqtt.Client()
+
+# Set callback functions
+local_client.on_connect = on_local_connect
+local_client.on_message = on_message
+
+remote_client.tls_set(ca_certs="/etc/mosquitto/certs/ca.crt", certfile="/etc/mosquitto/certs/client.crt", keyfile="/etc/mosquitto/certs/client.key")
+remote_client.tls_insecure_set(True)
+
+# Connect to the local MQTT broker
+local_client.connect(LOCAL_BROKER, LOCAL_PORT, KEEPALIVE)
+# Connect to the remote MQTT broker
+remote_client.connect(REMOTE_BROKER, REMOTE_PORT, KEEPALIVE)
+
+# Start the loop to process received messages and maintain connections
+local_client.loop_start()
+remote_client.loop_start()
+
+try:
+    while True:
+        pass  # Keep the script running
+except KeyboardInterrupt:
+    print("Exiting bridge server...")
+    local_client.loop_stop()
+    remote_client.loop_stop()
+    local_client.disconnect()
+    remote_client.disconnect()
+