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There will be a root certificate signed by a certificate authority.
The This root certificate will be uploaded to the Azure IoT Hub.is added into Azure IoTHub
For each IoT device we want to authenticate, we will create a separate client certificate, signed by the same certificate authority.
At the time of the authentication, our IoT device will present the client certificate as the proof of identity.
Azure IoT Hub will verify the identity based on the root certificate and the device name.

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On the IoT Hub resource Overview page, click “Certificates” menu on the left blade, and click the “Add” button.

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In the “Certificates” blade that appears, give a certificate name (eg. MyOrgIoTHubRootCertificateMyOrg RootCertificate).
Browse to your iotcerts/ca folder on your computer and import the ca.pem. Check the “Set certificate status to verified on upload” checkbox and click Save.

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Add device certificates to Azure Injector IoT Hub configuration

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Root Certificate

Friendly Name	Certificate Filename	File Description	File Location	CACertificate
DeviceCertificate	device.pem	Device Certificate	iotcerts/certs/device/device.pem
DeviceKey	device.key	Device Private Key	iotcerts/certs/device/device.key

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Update the Azure Injector > Settings > Azure IoT Hubs > Settings configuration to use the certificates as shown below. Note : the certificates created do not use a Password
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Verify the connection is established as shown by the Status on the Azure Injector > Settings > Azure IoT Hubs view

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