Differences Between Old and New SDKs
In addition to the old SDKs, we provide new device SDKs of more programming languages to deliver better performance and usability. New SDKs use product models and support new functions related to message, property, and device shadow processing. To learn about the concepts of new SDKs, see Terms.
The following table describes the differences between old and new SDKs.
| Item | Old SDK | New SDK |
| Supported programming languages |
|
|
| Application SDKs | Access with the old domain name and built-in certificate. Old domain name and port number: iot-api.cn-north-4.myhuaweicloud.com:8743 | Access with the new domain name and built-in certificate. New domain name: iotda.cn-north-4.myhuaweicloud.com |
| Device SDKs | Access with the old domain name and built-in certificate. Old domain name: iot-acc.cn-north-4.myhuaweicloud.com | Access with the new domain name and built-in certificate. New domain name: iot-mqtts.cn-north-4.myhuaweicloud.com |
Old SDKs use the V3 APIs provided by the platform. The address information displayed on the console, the certificates in documents, and the SDK resources use V5 APIs.
The platform still supports V3 APIs. Old SDKs or APIs must be used together with the corresponding version of domain name and certificate.
The following table describes the function differences between old and new device SDKs.
| Function | Old SDK (AgentLite) | New SDK (iot-device-sdk) |
| Open-source | Non-open-source | Open-source |
| Protocol | HTTPS+MQTTS | MQTTS/MQTT |
| Port | 8943+8883 | 8883/1883 |
| Device connection | HTTPS login | MQTT authentication |
| Data reporting | One API | Reporting data through diversified APIs and responding to downstream message, property, and platform commands |
| Command delivery | One command | Delivering commands through diversified APIs for delivering messages and commands, setting and querying properties. |
| Child device management | Gateway-based management | Application-based management and notification through the gateway |
| Certificate authentication | - | New feature. Devices can be connected to the platform using certificates. |
| Topic customization | - | New feature. You can customize topics, release data, and subscribe to messages on devices. |
| Device shadow | - | New feature. You can query device shadow data on devices. |
| OTA upgrade | - | New feature. You can upgrade devices in over the air (OTA) mode. |
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