
General Message Format
======================

Currently messages can maximally use 22 bytes for data because:
- maximum buffer size if 24 bytes
- the internal buffer needs an additional flags byte
- a message contains a checksum byte


Offset Length Meaning
---------------------------------------------------------
     0      1 destination address
     1      1 remaining message length
     2      1 command code
     3      1 source address
---------------------------------------------------------
     4      n payload data (depending on command code)



PING Message
============

Offset Length Meaning
---------------------------------------------------------
     0      1 destination address
     1      1 remaining message length
     2      1 command code
     3      1 source address



PONG Message
============

Offset Length Meaning
---------------------------------------------------------
     0      1 destination address
     1      1 remaining message length
     2      1 command code
     3      1 source address



Address Messages
================

This includes HAVE_ADDRESS, CLAIM_ADDRESS and DENY_ADDRESS.

Offset Length Meaning
---------------------------------------------------------
     0      1 destination address
     1      1 remaining message length
     2      1 command code
     3      1 source address
---------------------------------------------------------
     4      4 UID of the sending node
     8      1 bus address



RANGE Message
=============

Offset Length Meaning
---------------------------------------------------------
     0      1 destination address
     1      1 remaining message length
     2      1 command code
     3      1 source address
---------------------------------------------------------
     4      1 first available address
     5      1 last available address



FLASH_START Message
===================

Offset Length Meaning
---------------------------------------------------------
     0      1 destination address
     1      1 remaining message length
     2      1 command code
     3      1 source address
---------------------------------------------------------
     4      2 message number
     6      2 address



FLASH_ADDR Message
==================

Offset Length Meaning
---------------------------------------------------------
     0      1 destination address
     1      1 remaining message length
     2      1 command code
     3      1 source address
---------------------------------------------------------
     4      2 message number
     6      2 address



FLASH_DATA Message
==================

Offset Length Meaning
---------------------------------------------------------
     0      1 destination address
     1      1 remaining message length
     2      1 command code
     3      1 source address
---------------------------------------------------------
     4      2 message number
     6      n up to 8 words to write at given address



FLASH_END Message
=================

Offset Length Meaning
---------------------------------------------------------
     0      1 destination address
     1      1 remaining message length
     2      1 command code
     3      1 source address
---------------------------------------------------------
     4      2 message number



Flash_Response Message
======================

Offset Length Meaning
---------------------------------------------------------
     0      1 destination address
     1      1 remaining message length
     2      1 command code
     3      1 source address
---------------------------------------------------------
     4      2 message number
     6      1 response code (0 if okay, error code otherwise)



VALUE2 Message
==============

Offset Length Meaning
---------------------------------------------------------
     0      1 destination address
     1      1 remaining message length
     2      1 command code
     3      1 source address
---------------------------------------------------------
     4      4 UID of the sending node
     8      1 value id
     9      1 value type
    10      2 value
    12      2 denom



DEVICE Message
==============

Offset Length Meaning
---------------------------------------------------------
     0      1 destination address
     1      1 remaining message length
     2      1 command code
     3      1 source address
---------------------------------------------------------
     4      4 UID of the sending node
     8      2 firmware type
    10      2 firmware version
    12      2 modules mask



SENDSTATS Message
=================

Offset Length Meaning
---------------------------------------------------------
     0      1 destination address
     1      1 remaining message length
     2      1 command code
     3      1 source address
---------------------------------------------------------
     4      4 UID of the sending node
     8      2 packets out
    10      2 collisions
    12      2 aborted
    14      2 no buffer errors



RECVSTATS Message
=================

Offset Length Meaning
---------------------------------------------------------
     0      1 destination address
     1      1 remaining message length
     2      1 command code
     3      1 source address
---------------------------------------------------------
     4      4 UID of the sending node
     8      2 packets in
    10      2 crc errors
    12      2 io errors
    14      2 no buffer errors
    16      2 handled packets
    18      2 missed



