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    <p>You really need to provide a bit more detail... do the clients need guaranteed delivery? What about offline delivery? Is this part of a larger system? Do you need encryption? Security?</p> <p>If you want the smallest footprint possible, then should transmit data using SocketServer, Sockets, and serialization. But then you lose all of the advantages of the 3rd party solutions you mentioned, which typically include reliability, delivery guarantees, security, management, etc.</p> <p>I would personally use JMS, but that's because I'm familiar with it. There are a number of stand-alone servers that can be deployed out-of-the-box with virtually no configuration. They all provide for guaranteed delivery, some security, encryption, and a number of other easy-to-use features. Coding a JMS publisher or subscriber is pretty easy.</p> <hr> <p>Update: If you want the most ease in coding, then I would look at the third-party solutions. Looking at Smack/XMPP, the API seems to be a little easier than a JMS for the functionality you asked for. You still have to setup/configure a server, etc.</p> <p>The Smack API also has a lot of extra baggage that you don't need either, but its "concepts" are a little more intuitive since its all chat/IM concepts. </p> <p>I would still look at <a href="http://openjms.sourceforge.net/index.html" rel="nofollow noreferrer">OpenJMS</a> or <a href="http://activemq.apache.org/" rel="nofollow noreferrer">ActiveMQ</a>. I think knowing JMS will be more valuable in the future as compared to knowing XMPP. Take a look at their <a href="http://openjms.sourceforge.net/usersguide/using.html" rel="nofollow noreferrer">Getting Started</a> documentation or the <a href="http://java.sun.com/products/jms/tutorial/" rel="nofollow noreferrer">Sun Tutorial</a> to see how much coding is involved. In JMS parlance, you will want an administered "Topic" and a "Queue" where the Serial Port App will receive and send messages respectively. All of your clients will open a subscription to the Topic and send their outbound messages to the Queue. When you send messages, their delivery mode should be non-persistent.</p>
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    1. POMessaging solution for a serial hardware device
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    1. USJames Schek
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    1. COThanks for the response. I have updated my post to provide some more details. I removed the "lowest footprint" verbiage from the post since what I really want is the lowest complexity/coding effort.
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