implementing IoT Central application

I have created DPS Service, For that i need to connected to IoTHub or else is there any other process for IoT Central. And then where to get parameters like registartion_id and symmetrice key for connection.

If you're using IoT Central, you don't need to create a DPS instance and you don't need an IoT Hub. IoT Central includes these services internally. If you follow the IoT Central guickstart (https://learn.microsoft.com/en-us/azure/iot-central/core/quick-deploy-iot-central), you'll see how to register a device and get the SAS key.

I need to register a device in iot central application from device source code using python. for getting the parameters like provisioning host,register_id, symmetrickey i need to do any configuration in iot central. How can communication happened between device source code and iot central application.

There are three ways to register a device in IoT Central: automatically, bulk, or individually (see https://learn.microsoft.com/en-us/azure/iot-central/core/overview-iot-central-developer#register-a-device). For the automatic registration, all the device needs is the ID Scope value and a key or certificate derived from the enrollment group in your IoT Central application (see https://learn.microsoft.com/en-us/azure/iot-central/core/concepts-device-authentication#automatically-register-devices):

For bulk or individual registrations - you register the device in IoT Central before it connects - you can then find the device connection details in your IoT Central application:

can you please tell me how to request register a device in iot central application from device source code. I have used bellow code snippet. but i am getting 401 error even i put proper details.
provisioning_host = "global.azure-devices-provisioning.net"

registration_id1 = "3456"

id_scope = "0ne*****"

symmetric_key = "Sg*********"

provisioning_device_client = ProvisioningDeviceClient.create_from_symmetric_key(

    provisioning_host=provisioning_host, 

    registration_id=registration_id1,

    id_scope=id_scope,

    symmetric_key=symmetric_key,

)

provisioning_device_client.provisioning_payload = {"modelId": "dtmi:azurecloudinterface:Customtemplate_3w7;1"}

registration_result = await provisioning_device_client.register()

print(registration_result)

if registration_result.status == "assigned":

    print("Device registered successfully with DPS.")

    print("Assigned IoT Hub:", registration_result.registration_state.assigned_hub)

    print("The result",registration_result)