<p></p>
<p><b>@fjmolinas</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/13824#discussion_r427139283">pkg/openwsn/include/board_info.h</a>:</p>
<pre style='color:#555'>> +   slot */
+#ifndef SLOTDURATION
+#define SLOTDURATION        20        /* in miliseconds */
+#endif
+
+/* These parameters are BOARD and CPU specific.
+   Values cant be taken directly from OpenWSN since they do not necessarily use
+   the same BSP configuration (timers, clock speed, etc.)
+   For precise synchronization these values should be measured and tuned for
+   every BOARD.
+   To understand the relationship between these values and OpenWSN state machine
+   look at:
+   https://openwsn.atlassian.net/wiki/spaces/OW/pages/688251/State+Machine
+*/
+#if SLOTDURATION == 20
+#ifndef PORT_TsSlotDuration     /* 655 ticks at @32768Hz */
</pre>
<p>Just as a note I do not like this define based approach, but currently the code expects these defines to exist. There is some refactoring going on upstream where this are changed to a structure based approach, but there i no clear ETA, so I'll adapt to that once the change is in upstream.</p>

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