Hello,

I have developed a Spring Boot project using the spring-integration-mqtt library which under the hood uses org.eclipse.paho.client.mqttv3 . It works fine getting connected to a local MQTT that I have with the following configuration:

mqtt:
  options:
    automatic-reconnect: true
    clean-session: true
    connection-timeout: 10
    user-name: ****
    password: ****
    keep-alive-interval: 100    
  hostname: tcp://10.142.90.116:1883
Also I can connect to Azure IOT Hub using my MQTT explorer client:
But if I change my config file to:
mqtt:
  options:
    (...)   
  hostname: tcp://OffimanIoT.azure-devices.net/device/?api-version=2021-04-12:1883
It throws error java.lang.IllegalArgumentException: URI path must be empty "tcp://OffimanIoT.azure-devices.net/device/?api-version=2021-04-12:1883"
If I use:
mqtt:
  options:
    (...)   
  hostname: tcp://OffimanIoT.azure-devices.net
It throws Connection timeout.
And if I use:
mqtt:
  options:
    (...)   
  hostname: mqtt://OffimanIoT.azure-devices.net/device/?api-version=2021-04-12:1883
It throws java.lang.IllegalArgumentException: no NetworkModule installed for scheme "mqtt" of URI "mqtt://OffimanIoT.azure-devices.net/device/?api-version=2021-04-12:1883".
Does anyone know how to fix this? Thanks in advance for your help.
Best regards,
Jaime.
											
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Hello @Jaime,
you can see how the IoT Hub supports MQTT without using any of the Azure IoT Device SDKs here. 
The example is written in C# but you get a feeling on how the specific topics are working.
There, you see you need to provide the SAS token for a device.
Is your device named 'device' as seen in:
hostname: tcp://OffimanIoT.azure-devices.net/device/?api-version=2021-04-12:1883
I'm not sure if the 'tcp://' or 'mqtt://' are working.
Regarding the port, please check if you use 8883 as documented.
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