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Transport.md

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|  8  |  16  |  24   |  32  |  40  |  48  |  56  |  64  |
+-----+------+-------+------+------+------+------+------+
|   purpose  | flags |  RSV |            size           |
+------------+-------+------+---------------------------+
|                           ...                         |
|                          body                         |
|                           ...                         |
+                                                       +
  • Purpose: 2 byte enum, little endian
  • Flags: 1 byte
  • RSV: 1 byte, Reserved for future use
  • Size: 4 bytes, unsigned integer, little endian

Reserved (RSV) fields may be any value, and the value of these fields MUST be ignored.

Purpose

The purpose specifies the purpose of the data, regardless of the way it's transmitted. For example, the purpose would specify "this is water", not which form it comes in (bottled, frozen, etc.) as that would be the job of the flags.

Flags

|    7    |    6    |    5    |    4    |    3    |    2    |    1    |    0    |
+---------+---------+---------+---------+---------+---------+---------+---------+
|   RSV   |   RSV   |   RSV   |   RSV   |   RSV   |   RSV   |   RSV   |   comp  |
  • Comp: Compressed (zstd)

Transport layer

TCP and UDP may be used interchangably in this protocol. UDP may only be used for messages which are not reliable and which may be dismissed, such as position data.