public void setTunnelArn(String tunnelArn) {
        this.tunnelArn = tunnelArn;
    }
<p>
The Amazon Resource Name (ARN) of a tunnel.
</p>

@param tunnelArn
       The Amazon Resource Name (ARN) of a tunnel.
aws-java-sdk-iotsecuretunneling/src/main/java/com/amazonaws/services/iotsecuretunneling/model/Tunnel.java