Seeing Remove event after some minutes
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Description
I see a _Remove_ event after some minutes for the service I published with mDNS.
Here is the output of `dns-sd -B `
```
19:23:07.208 Add 2 4 local. ._tcp. ...
19:31:11.247 Rmv 1 4 local. ._tcp. ...
19:31:11.247 Add 2 4 local. ._tcp. ...
19:39:36.689 Rmv 1 4 local. ._tcp. ...
19:39:36.689 Add 2 4 local. ._tcp. ...
```
I think because other devices are actively looking for this service, the service appears again and I see the _Add_ event. I've done some research if we need to send some kind of keep-alive message, but could not find an answer.
When I publish a service using the command line tool `dns-sd` on OS X, I don't see any _Remove_ events for the service.
Anyone knows what's going on there?
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