Message Specification
=====================

Overview
--------

+----------------+-------------+-------------+----------------------------------+
| Offset         | Field       | Length      | Description                      |
| (in bytes)     |             | (in bytes)  |                                  |
+================+=============+=============+==================================+
| 0              | type        | 1 (uint8)   | Message type                     |
+----------------+-------------+-------------+----------------------------------+
| 1              | src_len     | 1 (uint8)   | Source node address length       |
+----------------+-------------+-------------+----------------------------------+
| 2              | dst_len     | 1 (uint8)   | Destination node address length  |
+----------------+-------------+-------------+----------------------------------+
| 3              | flags       | 1 (uint8)   | Optional flags                   |
+----------------+-------------+-------------+----------------------------------+
| 4              | uid         | 4 (uint32)  | Unique ID for Request / Response |
+----------------+-------------+-------------+----------------------------------+
| 8              | payload_len | 4 (uint32)  | Payload legth                    |
+----------------+-------------+-------------+----------------------------------+
| 12             | src         | src_len     | Source node address              |
+----------------+-------------+-------------+----------------------------------+
| 13 + src_len   | dst         | dst_len     | Destination node address         |
+----------------+-------------+-------------+----------------------------------+
| 14 + src_len + | payload     | payload_len | Payload data                     |
| dst_len        |             |             |                                  |
+----------------+-------------+-------------+----------------------------------+