HeartbeatEvent

about heartbeatevent is used to indicate that a device is still working properly and connected to the internet each device will send a heartbeatevent at the interval specified in its heartbeatinterval parameter, regardless of any other events example published heartbeatevent { "device" "mydevicename", "receivedtime" "2017 05 19t06 14 59z", "type" "heartbeatevent", "eventid" "9eebaf4b 52a6 487b bf2c b8f8e88bf906", "eventtime" "2017 05 19t06 14 30z" }