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MQTT Transmission must have both a client connection an RPC client enabled and connected to a broker/server to use the publish mechanism and have the RPC Client Connection enabled.

Prior to release 4.0.18 , configuration for the RPC Client was under the Server Advanced

For release 4.0.18 to 4.0.22, configuration for the RPC Client was under the Server RPC Client Connection

For release 4.0.23 and newer, configuration for the RPC Client is under Server RPC Client Connection and Sets RPC Client