public Long getTimestamp() {
        return this.timestamp;
    }
<p>
The epoch time (in milliseconds) when the thing last connected or disconnected. If the thing has been
disconnected for approximately an hour, the time value might be missing.
</p>

@return The epoch time (in milliseconds) when the thing last connected or disconnected. If the thing has been
        disconnected for approximately an hour, the time value might be missing.
aws-java-sdk-iot/src/main/java/com/amazonaws/services/iot/model/ThingConnectivity.java