Overview-IoT Platform (Deprecated)(IoT)-阿里云帮助中心

If you develop products in C, you can use the C Link SDK from IoT Platform to simplify development and quickly connect devices to IoT Platform.

Instructions

You can use the C Link SDK to connect Internet-capable devices to IoT Platform.
You can configure the C Link SDK for device management and monitoring. For more information, see Features.
You can customize the C Link SDK as needed. For more information, see Obtain the C Link SDK.
For devices connected using an MCU and a module, see SDK porting reference.
You can port the C Link SDK to different operating systems or hardware platforms. For more information, see Porting examples.

If the C Link SDK does not provide a suitable adapter for some devices connected using an MCU and a module, you can develop your own adapter based on open protocols. For more information, see:

Features

Type	Feature module	Description	References
Device connection	MQTT connection	Establish a connection over the Message Queuing Telemetry Transport (MQTT) protocol between a device and IoT Platform to enable communication. Important To have IoT Platform push messages to a device, connect the device over MQTT.	MQTT connection
	HTTPS connection	Establish a connection over the HTTPS protocol between a device and IoT Platform to allow the device to report data to IoT Platform.	HTTPS connection
	Device authentication	Authenticate devices using device secrets. Dynamic registration over HTTPS and MQTT is also supported. Authenticate devices using X.509 certificates.	MQTT connection HTTPS connection Connect using an X.509 certificate
Device connection	CoAP connection	Establish a connection over the Constrained Application Protocol (CoAP) between a device and IoT Platform to allow the device to report data to IoT Platform.	CoAP connection
Message communication	RRPC	Devices support synchronous revert-RPCs (RRPCs) from IoT Platform.	RRPC
Message communication	Broadcast communication	A device can receive broadcast messages from the server without subscribing to broadcast topics.	Broadcast communication
Device management	Thing Specification Language model	Manage devices based on Thing Specification Language (TSL) models, eliminating the need to handle data exchange formats between devices and IoT Platform and reducing development costs.	Thing Specification Language model
	Device tag	Define custom IDs for devices to flexibly manage them.	Device tag
	Device job	Initiate property settings, asynchronous service invocations, and custom tasks for multiple devices at the same time.	Device job
	Device shadow	Cache device status so that online devices can obtain instructions directly from the cloud, and devices coming back online after being offline can actively pull instructions.	Device shadow
	NTP service	A device obtains the current time from IoT Platform.	NTP service
	Gateways and sub-devices	Connect a device through its gateway to IoT Platform, allowing devices without IP addresses to connect indirectly.	Gateways and sub-devices
	Device distribution	Implement unified programming for devices in different regions and facilitate business migration.	Device distribution
	File upload	Upload files to an Alibaba Cloud IoT Platform server for storage.	File upload
Monitoring and O&M	Remote logon	Remotely control and manage devices.	Remote logon
	Log reporting	A device uploads logs in real time.	Log reporting
	Over-the-air (OTA) update	A device performs device-side upgrades through IoT Platform. The device obtains upgrade messages from IoT Platform and downloads the upgrade package. Write the downloaded upgrade package to the device's Flash or ROM to apply it and complete the OTA upgrade.	OTA update
	Remote Configuration	Remotely update configuration information such as system and network parameters without restarting or interrupting the device.	Remote Configuration
	Secure tunnel	Remotely access, diagnose, and manage devices.	Secure tunnel

Version guide

Version number	Description	Notes	References
4.x	Reduced RAM requirements. Weakened dependencies between features. Improved the development experience across different operating systems. Implemented customization.	The APIs of this branch are not compatible with earlier versions. Devices cannot be connected to the Lifestyle IoT Platform. Important This SDK version is regularly updated and maintained. Use this version.	C Link SDK Obtain the C Link SDK
3.x	Provides a code extraction tool for more convenient feature clipping.	Flexibly extract required feature code from this SDK version for easier porting. This version is no longer upgraded and does not support some advanced features.	Obtain the SDK Quick start
2.x	Compared with version 1.x, some IoT Platform features are added. Compile in a Linux environment.	When you compile the SDK, use the proprietary compilation method defined by Alibaba Cloud. Clipping and porting the SDK are complex. This version is not recommended.	Download the SDK
1.x	Initial version.	Not recommended.	None.