Device Context
- When an IoT sensor reports to the platform, a new Device data structure is created, which will hold all the meta information like, created time, last reported time, last protocol channel it reported etc. And also a separate key-value storage space is created for each and every device where you can store device related information of any datatype
- Context Variable: device
- Only Applicable To: Message Rules, Binary Rules & Domain Rules
- Even though an instance of the device is available in the message and binary rules, devices can also be fetched from other types of rules using Domain Context.
API Interface
// Retrieve the Device model object
public Device get();
// Creates a Device Group and returns the context
public DeviceGroupContext createGroup(long groupId, String name);
// Retrieves a DeviceGroup with specified id
public DeviceGroupContext group(long groupId);
APIs Inherited From
Example
def inited = device.get("inited", false)
if(!inited){
device.property("statistics", ['counter':0]);
}
def stats = device.property("statistics");
stats.counter = ++stats.counter;
long diff = (utils.millis() - device.get().getReportedStamp().getTime())/1000;
stats['connected'] = (diff <= 180) ? true : false;
//update the property
device.property("statistics", stats); //Property storage
device.put('inited', true); //Lookup variable
See Also
Related REST APIs
Register New Device
Create / Update Device
Retreive Device
Delete Device
List Devices
Count All Devices
Search Devics
Updated over 3 years ago