@java.lang.Override
    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
        if (code_ != 0) {
            output.writeUInt32(3, code_);
        }
        if (!com.google.protobuf.GeneratedMessage.isStringEmpty(digit_)) {
            com.google.protobuf.GeneratedMessage.writeString(output, 4, digit_);
        }
        getUnknownFields().writeTo(output);
    }
<code>string digit = 4;</code>

@return The bytes for digit.
turms-plugins/turms-plugin-livekit/src/main/java/im/turms/plugin/livekit/core/proto/models/SipDTMF.java