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Added simple change to allow user detection of services *leaving* via…#60

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JohnGrime wants to merge 1 commit intograndcat:masterfrom
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Added simple change to allow user detection of services *leaving* via…#60
JohnGrime wants to merge 1 commit intograndcat:masterfrom
JohnGrime:byebye

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@JohnGrime
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… TTL=0 in DNS-SD messages.

This is quite useful to detect when services gracefully leave zeroconf, which is handy when implementing various approaches to dynamic networking.

I've also modified the resolv example to prepend "[+]" or "[-]" to the service information; this indicates whether a) the service was detected, or b) it just (gracefully) left.

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This failed test appears to have nothing to do with my code changes! :)

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