Structure

• Protocol Version: The version of the protocol (always 3).
• Message Length: The length of the message, including the version, header, data, and checksum.
• Message Type: The type of message. This is used to determine how to interpret the message.
• Data: Both data field (header and payload) are made up of the same format:
  • Field Count: The number of fields in the data.
  • Fields: List of field types in the data
  • Data: The data itself, making used of bBytes to represent length and values.
• Checksum: A 16-bit CRC checksum of the message (XMODEM).

Data

Within each Data element (the header data, or payload data), the structure is as follows:

Byte position	Description	Type	Example
1 -> 2	Number of fields (n)	uint16	2 0
3 -> 3+n	Field types	[]uint8	1 2
3+n+1 -> end	Data	[]bBytes	[1 8] [3 9 9 9]

The Data should be in the order of the field types.

The example data includes 2 data fields, the first of type 1, with value byte array [8], the second of type 2, with value byte array [9 9 9].

bBytes

bBytes are a byte array that represents a length and then the data itself.

For example, [1 8] would represent a byte array of length 1, with the value 8.

Or [3 9 9 9] would represent a byte array of length 3, with the values 9, 9, 9.