Extend group timeout on any adb connect activity.

lib/roles/device/plugins/connect.js

@@ -35,6 +35,9 @@ module.exports = syrup.serial()
 
         server.on('connection', function(conn) {
           log.info('New remote ADB connection from %s', conn.remoteAddress)
+          conn.on('userActivity', function() {
+            group.keepalive()
+          })
         })
 
         server.on('error', reject)

lib/roles/device/plugins/group.js

@@ -66,6 +66,12 @@ module.exports = syrup.serial()
         })
     }
 
+    plugin.keepalive = function() {
+      if (currentGroup) {
+        channels.keepalive(currentGroup.group)
+      }
+    }
+
     plugin.leave = function() {
       return plugin.get()
         .then(function(group) {