public void setTunnelId(String tunnelId) {
        this.tunnelId = tunnelId;
    }
<p>
A unique alpha-numeric ID that identifies a tunnel.
</p>

@param tunnelId
       A unique alpha-numeric ID that identifies a tunnel.
aws-java-sdk-iotsecuretunneling/src/main/java/com/amazonaws/services/iotsecuretunneling/model/Tunnel.java