@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nfVendor_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, nfVendor_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nfType_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, nfType_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(nfVersion_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 3, nfVersion_);
    }
    getUnknownFields().writeTo(output);
  }
<pre>
Output only. NF version.
</pre>

<code>string nf_version = 3 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@return The bytes for nfVersion.
java-telcoautomation/proto-google-cloud-telcoautomation-v1alpha1/src/main/java/com/google/cloud/telcoautomation/v1alpha1/SiteVersion.java