Transport Limits
----------------

The following limitations apply to all |me| transports.

IDL Data Types and Size
.......................

|me| is limited to IDL data types less than or equal to 63000 bytes *or* the 
maximum transmission unit (MTU) of the underlying transport, 
whichever is smaller.

.. _section-MTU:

Maximum Transmission Unit (MTU)
...............................

|me| does not query the MTU size from the registered transport plugins. 
If a sample exceeds the MTU size while the :link_connextmicro_dds_api_c_up_two:`RELIABILITY <group__DDSReliabilityQosModule.html>`
QoS Policy is set to ``RELIABLE``, |me| will silently discard the data. However,
if :link_connextmicro_dds_api_c_up_two:`RELIABILITY <group__DDSReliabilityQosModule.html>`
is set to to ``BEST_EFFORT``, |me| will instead fragment the sample before
sending it. |me| will automatically fragment any sample with a serialized size
exceeding the smallest MTU size of all enabled transports.

Maximum Receive Unit (MRU)
..........................

|me| does not track the maximum receive unit (MRU) of other nodes in the 
system. Therefore, |me| relies on consistent configuration accross all
the nodes in the system in order to successfully send and receive data.
For example, if a node has a MRU of 8000 bytes and another node 
sends 9000 bytes (with a sufficiently large MTU), the data will be sent, 
but not received.