In-memory reaper. TtlSet needs tests.

lib/units/provider/index.js

@@ -126,6 +126,7 @@ module.exports = function(options) {
           return false
         }
         if (options.filter && !options.filter(device)) {
+          log.info('Filtered out device "%s"', device.id)
           return false
         }
         return listener(device)
@@ -407,19 +408,6 @@ module.exports = function(options) {
     lifecycle.share('Tracker', tracker)
   })
 
-  // This keeps the devices "present" in the database. It relies on the
-  // provider channel changing on every run so that we never match old
-  // devices.
-  ;(function heartbeat() {
-    push.send([
-      wireutil.heartbeat
-    , wireutil.envelope(new wire.ProviderHeartbeatMessage(
-        solo
-      ))
-    ])
-    setTimeout(heartbeat, options.heartbeatInterval)
-  })()
-
   lifecycle.observe(function() {
     [push, sub].forEach(function(sock) {
       try {