Question: Multipledealers 1 router

[Rik Svendsen Rose]

Hi

I have a system with multiple mobile devices. The devices may, or may not be online.

It seams like i can use the Router/Dealer pattern in netMq/ZeroMQ to support muliple (hundreds) of dealers and 1 router.

Then the router can be used to "publish" messages to specific clients. i.e. only the clients that need a defined message.

If The Dealer sends a frame from a connecting device using "SendFrame" i can make the Router accept mesages from one or more dealers.

I can use this frame as a "Hey, i am online, send me my stuff" message. and use the client id for many messages after...

But is this a bad idea?`Ie. mutipler dealers, 1 router? I know i could use topics in publish, but the dealer / router is on sent to the clientid, hence i expect saving data transfer. I.e. the publish messages uses data on all devices, but the router/dealser sends to thed specific sockets that a dealer is on...

Thanks, Any advice would be super..!

BR Rik

[Doron Somech]

That a valid solution.

Let me suggest a protocol:

- The user sends CONNECTION-OPEN message with identifying data.

- The router sends back a CONNECTION-ACK and associates the identity with the user information.

- The router now pushes relevant information to the client.

- You can set Options.Mandatory to true, this will through an exception if the client is disconnected, so you can know when a client is down.

- You can also use heartbeat from client to server, the user will send a PING message and the router will respond with PONG. If router doesn't receive a PING for a certain time period, it will remove the identity and user information in order to stop sending messages to the user identity.

- Finally, it the router receive a message from unknown identity, it should reply with ERROR message. When the user receives an ERROR message he will send the CONNECTION-OPEN again. This is important in order to recover from disconnections.

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