public void setDisconnectReason(String disconnectReason) {
        this.disconnectReason = disconnectReason;
    }
<p>
The reason why the client is disconnected. If the thing has been disconnected for approximately an hour, the
<code>disconnectReason</code> value might be missing.
</p>

@param disconnectReason
       The reason why the client is disconnected. If the thing has been disconnected for approximately an hour,
       the <code>disconnectReason</code> value might be missing.
aws-java-sdk-iot/src/main/java/com/amazonaws/services/iot/model/ThingConnectivity.java