Hello @M07D ,
To connect a device directly to Azure IoT Central, the device needs to support the concepts of a Device template and the specific Azure IoT device registration specifics (just how devices are enrolled in Azure Device Provisioning Service).
If this is not the case, you could still connect to Azure IoT Central using the Azure IoT Central bridge.
In this case, you can just send telemetry to this Azure function (with an HTTP trigger acting as a web hook) capable of transforming incoming messages and sending them to your Azure IoT Central application.
You probably have to alter the code of the Azure Function a bit to support your specific device.