---
title: Events
slug: develop/events
docTags: 
createdAt: 2025-03-11T07:07:17.199Z
---

Events in BrightScript center around an event loop and the *roMessagePort* object. Most BrightScript objects can post to a message port in the form of an event object: For example, the *roTimer* object posts events of the type *roTimerEvent* when configured intervals are reached.

The following script sets the destination message port using the `SetPort()` method, waits for an event in the form of an *roGpioButton* object, and then processes the event.

```text
print "BrightSign Button-LED Test Running"
p =   CreateObject("roMessagePort")
gpio =  CreateObject("roGpioControlPort") 
gpio.SetPort(p)
 
while true
   msg=wait(0, p)
   if type(msg)="roGpioButton" then
       butn = msg.GetInt()
       if butn <=5 then
           gpio.SetOutputState(butn+17,1)
           print "Button Pressed: ";butn
           sleep(500)
           gpio.SetOutputState(butn+17,0)
        end if
    end if
 
   REM ignore buttons pressed while flashing led above
   while p.GetMessage()<>invalid
         end while
end while
```

Note that lines 6-7 can be replaced using the following (and substituting `end while` with `end for`):

```text
For each msg in p
```