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)