add groups feature

lib/units/device/plugins/connect.js

@@ -1,3 +1,7 @@
+/**
+* Copyright © 2019 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+**/
+
 var util = require('util')
 
 var syrup = require('stf-syrup')
@@ -117,6 +121,7 @@ module.exports = syrup.serial()
       if (plugin.isRunning()) {
         activeServer.close()
         activeServer.end()
+        activeServer = null
       }
     })
 
@@ -131,7 +136,7 @@ module.exports = syrup.serial()
     }
 
     lifecycle.observe(plugin.stop)
-    group.on('leave', plugin.end)
+    group.on('leave', plugin.stop)
 
     router
       .on(wire.ConnectStartMessage, function(channel) {
@@ -163,7 +168,7 @@ module.exports = syrup.serial()
       })
       .on(wire.ConnectStopMessage, function(channel) {
         var reply = wireutil.reply(options.serial)
-        plugin.end()
+        plugin.stop()
           .then(function() {
             push.send([
               channel
@@ -187,6 +192,5 @@ module.exports = syrup.serial()
           })
       })
 
-    return plugin.start()
-      .return(plugin)
+    return(plugin)
   })