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Sending a command message with the RFH structure

Figure 15 shows how the RFH structure (including the NameValueString) is appended to the Message Descriptor to send a message to a broker. In this case, the message is to register a subscriber to the topic "IBM Stock Price". Part of the message descriptor is shown, together with the message data that consists of the RFH structure. Pad the NameValueString to a multiple of four bytes.

Details of the name/value pairs for all the command messages are given in Publish/Subscribe command messages.

Figure 15. Message descriptor and RFH structure. The message descriptor indicates that the subscriber has nominated its subscriber queue to be the same as its reply queue. It also defines the encoding and CCSID of the RFH structure, which follows as the message data. The encoding and CCSID fields in the RFH structure are not set, because there is no data following the RFH structure (compare with Figure 16). Note that the length of the RFH structure includes the NameValueString (which contains the name/value pairs defining the Register Subscriber command). The topic string is quoted because it contains significant blanks.

 

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