Serverless Cloud Function (SCF) supports MQTT Message Queue triggers. The trigger is based on the MQTT Shared Subscription mechanism, which can subscribe to and consume messages according to the Topic Filter defined in your business, thereby automatically triggering the execution of the corresponding function. Through this mechanism, SCF can establish efficient and asynchronous communication links with IoT devices. Messages are reliably routed and distributed via the MQTT cluster, and load balancing across multiple triggers is achieved through shared subscription, enabling high-concurrency IoT scenarios requiring real-time response, such as vehicle status monitoring and remote smart control.
Scenarios
New Energy Vehicle Battery Management
The vehicle's TCU module triggers SCF via MQTT messages and calls different services subsequently based on the vehicle's status.
Low battery warning and response: When the vehicle TCU detects the battery level is below the threshold, it publishes a status message via MQTT topics, triggering SCF to perform operations such as notifying users and navigating to a charging station.
Remote device control: SCF sends instructions to the vehicle via MQTT (such as limiting air conditioning power) to implement energy-saving control.
Real-time status synchronization: You can subscribe to MQTT topics via HTML/mini program page to monitor battery changes in real time.
Features and Strengths
Event-driven and real-time response: SCF is automatically triggered by MQTT messages with no need for polling. Device status changes (for example, low battery) can be transmitted to the cloud as events immediately, triggering subsequent business chains.
This achieves near real-time business processing, significantly reducing delay from event occurrence to system response, excellently meeting IoT application requirements for real-timeness.
Serverless architecture, ultimate elasticity and cost optimization: SCF runs in the serverless mode, automatically scaling based on MQTT message arrival frequency with no need to manage servers. This enables zero idle cost, with auto scaling easily handling sudden traffic surges and simplified operations.
Loose coupling integration: The MQTT topic serves as a message bus, completely decoupling device reporting from business processing. Different business features (such as notification, navigation, energy-saving control) are handled independently by different SCFs, offering high flexibility and maintainability.
