Hi, In Device + Server Communication Push notifications used to notify devices to retrieve the device operations. This also use in policy monitoring where we send push notification to all devices during monitoring task. There are different push notification strategies as for APNS, for android - GCM/FCM and for Windows - WNS also MQTT based push notifications.
*Problem* In current implementation when you set device operation to multiple devices, or during policy monitoring all push notifications are send all devices at once. This will cause sudden request burst when all devices try access the server for device operations. We also needs to think about of reliability of push notifications if those got failed. To solve this issue we have multiple solutions. *Solutions* *1) Use Message store and Message Processors* We can send each push notification message to inbuilt synapse message store via proxy. Then we can have sampling message processor to send those push notifications to given notification provider. In sampling message processor we can define no of message per given time and time interval per batch of messages. Push notification logic will be inside sequence with custom mediator. Pros; Reliability can be achieved using jms message store. minimum code Cons; IOT server have to depend on message processors. *2) Java Queue with Scheduler Task* We can have java concurrent queue to store device notifications as batch jobs. Scheduler task will be there to read jobs and process them and send notifications. Batch job object will content set of devices given batch size and scheduler task will be run based on delay interval. Pros; Do not need to rely on other feature Cons; We need to maintain push status in database so there will be additional database call in order to make reliability of notification sending. Later we can have retry logic to failed notifications based on db status. If device list is below the no of devices per batch, those commands will send immediately. IMO option 2 is better since we do not rely on any other implementation. Appreciate any suggestions. Thanks, Waruna -- Regards, Waruna Lakshitha Jayaweera Senior Software Engineer WSO2 Inc; http://wso2.com phone: +94713255198 http://waruapz.blogspot.com/
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