Deploying OCI-based IoT Application with MQTT: Configuration Challenges
I've searched everywhere and can't find a clear answer... Currently developing an IoT application that relies heavily on Oracle Cloud Infrastructure (OCI) to handle MQTT messaging between devices in a staging environment. The setup involves using the Oracle IoT Cloud service for device management and communication. During the configuration, I encountered difficulties establishing a reliable connection to the MQTT broker. Despite following the official documentation, I suspect that my configurations might be off. The broker is supposed to be accessible at `mqtt://my-iot-broker:1883`, but I often receive a `Connection Refused` error when attempting to connect. I’ve verified the following: 1. **Network security settings**: My VCN and subnet configurations appear correct, with inbound rules allowing traffic on port 1883. 2. **Device configuration**: Each IoT device is configured with the correct credentials and endpoint. Here's a snippet from my device's connection code: ```python import paho.mqtt.client as mqtt def on_connect(client, userdata, flags, rc): print("Connected with result code " + str(rc)) client.subscribe("my/topic") client = mqtt.Client() client.username_pw_set("username", "password") client.on_connect = on_connect client.connect("mqtt://my-iot-broker:1883", 60, 60) client.loop_forever() ``` 3. **IAM Policies**: The user account I’m using has the necessary permissions, but I still wonder if there’s a missing policy for MQTT access. Moreover, I tried testing the connection using MQTT.fx, which works perfectly, so I suspect the issue lies in the code or configuration rather than a network-related problem. Could anyone point me in the right direction to troubleshoot the connection refusal? Any insights into common pitfalls when configuring MQTT for OCI would be greatly appreciated. How would you solve this? I'm developing on Debian with Python.