In my office building we have laptops on multiple floors all running a WCF Service. When WCF services communicate with each other, will a message for an out-of-range device automatically reach it by multi-hopping? Does WCF/the WLAN device driver handle this? Or do I have to detect if a device is not contactable/out-of-range and implement hopping in my own service?
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As long as you have a connection from your WCF client to the service – yes, all avenues will be used. You shouldn’t have to concern yourself with things like what network path your messages take – the network just has to be present and stable for the duration of a call 😉
There’s nothing in WCF to deal with this, really – this should be handled way lower in the network stack, by the driver or the OS.