From dcd5117f896d3850318090a1e3dfe59a739c1c4c Mon Sep 17 00:00:00 2001
From: Jackie Kay <jackie@osrfoundation.org>
Date: Thu, 5 Nov 2015 14:02:51 -0800
Subject: [PATCH] Change timer beginning behavior

---
 rclcpp/include/rclcpp/timer.hpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/rclcpp/include/rclcpp/timer.hpp b/rclcpp/include/rclcpp/timer.hpp
index e418b79..5180cab 100644
--- a/rclcpp/include/rclcpp/timer.hpp
+++ b/rclcpp/include/rclcpp/timer.hpp
@@ -97,9 +97,8 @@ public:
   GenericTimer(std::chrono::nanoseconds period, CallbackType callback)
   : TimerBase(period, callback), loop_rate_(period)
   {
-    /* Subtracting the loop rate period ensures that the callback gets triggered
-       on the first call to check_and_trigger. */
-    last_triggered_time_ = Clock::now() - period;
+    /* Set last_triggered_time_ so that the timer fires at least one period after being created. */
+    last_triggered_time_ = Clock::now();
   }
 
   /// Default destructor.