@Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("{");
        if (getFNwkSIntKey() != null)
            sb.append("FNwkSIntKey: ").append(getFNwkSIntKey()).append(",");
        if (getSNwkSIntKey() != null)
            sb.append("SNwkSIntKey: ").append(getSNwkSIntKey()).append(",");
        if (getNwkSEncKey() != null)
            sb.append("NwkSEncKey: ").append(getNwkSEncKey()).append(",");
        if (getAppSKey() != null)
            sb.append("AppSKey: ").append(getAppSKey());
        sb.append("}");
        return sb.toString();
    }
Returns a string representation of this object. This is useful for testing and debugging. Sensitive data will be
redacted from this string using a placeholder value.

@return A string representation of this object.

@see java.lang.Object#toString()
aws-java-sdk-iotwireless/src/main/java/com/amazonaws/services/iotwireless/model/SessionKeysAbpV11.java