<blockquote>
<pre><code>* I don't use your docker setup or build script if that makes any difference? Why don't you use the easy RIOT integration `BUILD_IN_DOKCER=1 make` ? (See [here](https://github.com/RIOT-OS/RIOT/wiki/Use-Docker-to-build-RIOT) for more detail)

* You do already set 100Hz [here](https://github.com/jhx2002/test_riot/blob/master/udp/sender/sender.c#L49) by sleeping 10ms. However, I set sleep to 1ms and still works
</code></pre>
</blockquote>
<ul>
<li>can you test how long it could continuously  run ?</li>
</ul>
<blockquote>
</blockquote>
<blockquote>
<pre><code>* I use a stm32f4discovery which contains a STM32F407VG (not STM32407VET6)

* My pins are connected as you set up in the Makefile. Furthermore,
  VCC - 3V
  GND -GND
  CLKOUT - open
  WOL - open

* I figured some other weird thing right now. Sometimes when press reset while running, the program doesn't start running again until I wobble a little bit the jumper cables (I assume it is VCC)
</code></pre>
</blockquote>

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