Merge pull request #166502 from dominicbetts/central-device-id

Add information about device IDs

Author: PRMerger17

articles/iot-central/core/howto-manage-devices-in-bulk.md

@@ -168,8 +168,8 @@ To connect large number of devices to your application, you can bulk import devi
 
 | Column | Description |
 | - | - |
-| IOTC_DEVICEID | The device ID is a unique identified this device will use to connect. The device ID can contain letters, numbers, and the `-` character without any spaces. |
-| IOTC_DEVICENAME | Optional. The device name is a friendly name that will be displayed throughout the application. If not specified, the same as the device ID.   |
+| IOTC_DEVICEID | The device ID is a unique identified this device will use to connect. The device ID can contain letters, numbers, and the `-` character without any spaces. The maximum length is 128 characters. |
+| IOTC_DEVICENAME | Optional. The device name is a friendly name that will be displayed throughout the application. If not specified, the same as the device ID. The maximum length is 148 characters. |
 
 To bulk-register devices in your application:
 
@@ -225,7 +225,7 @@ To bulk export devices from your application:
     * IOTC_X509THUMBPRINT_PRIMARY
     * IOTC_X509THUMBPRINT_SECONDARY
 
-For more information about connection strings and connecting real devices to your IoT Central application, see [Device connectivity in Azure IoT Central](concepts-get-connected.md).
+For more information about connecting real devices to your IoT Central application, see [Device connectivity in Azure IoT Central](concepts-get-connected.md).
 
 ## Next steps
 

articles/iot-central/core/howto-manage-devices-individually.md

@@ -44,6 +44,8 @@ To add a device to your Azure IoT Central application:
 
 1. Choose + **New**.
 
+1. Enter a device name and ID or accept the default. The maximum length of a device name is 148 characters. The maximum length of a device ID is 128 characters.
+
 1. Turn the **Simulated** toggle to **On** or **Off**. A real device is for a physical device that you connect to your Azure IoT Central application. A simulated device has sample data generated for you by Azure IoT Central.
 
 1. Select **Create**.