Add a sent too fast check for simulation and shm

Returns an error if more than queue_size (frequency *
channel_storage_duration) messages were sent in one
channel_storage_duration.

Signed-off-by: Eric Schmiedeberg <eric.schmiedeberg@bluerivertech.com>
Change-Id: Ie41205ba37b66930d8a9082f2d85d7dc3388e3bf
diff --git a/aos/configuration.fbs b/aos/configuration.fbs
index c0d67b0..7595167 100644
--- a/aos/configuration.fbs
+++ b/aos/configuration.fbs
@@ -57,6 +57,9 @@
   // Type name of the flatbuffer.
   type:string (id: 1);
   // Max frequency in messages/sec of the data published on this channel.
+  // The maximum number of messages that can be sent
+  // in a channel_storage_duration is
+  // frequency * channel_storage_duration (in seconds).
   frequency:int = 100 (id: 2);
   // Max size of the data being published.  (This will hopefully be
   // automatically computed in the future.)