Info from this page mainly comes from http://www.adreamerslair.nl/2014/02/eq-3-max-cube-message-protocol-decrypted-part-4-the-c-word/
The C message looks like this:
C:03f25d,7QPyXQATAQBKRVEwNTQ0OTIzAAsABEAAAAAAAAAAAPIA==\r\n
The first field contains the address of the device in HEX form.
The second and last field contains a Base64 encoded string with the configuration data for the device (as identified by its address). The decoded bytes will look something like this for the Cube device itself
0000: ed 03 f2 5d 00 13 01 00 ........
0008: 4a 45 51 30 35 34 34 39 JEQ05449
0010: 32 33 00 0b 00 04 40 00 23......
0018: 00 00 00 00 00 00 00 ff ........
0020: ff ff ff ff ff ff ff ff ........
0028: ff ff ff ff ff ff ff ff ........
0030: ff ff ff ff 0b 00 04 40 ........
0038: 00 00 00 00 00 00 00 41 .......A
0040: ff ff ff ff ff ff ff ff ........
0048: ff ff ff ff ff ff ff ff ........
0050: ff ff ff ff ff 68 74 74 .....htt
0058: 70 3a 2f 2f 6d 61 78 2e p://max.
0060: 65 71 2d 33 2e 64 65 3a eq-3.de:
0068: 38 30 2f 63 75 62 65 00 80/cube.
0070: 30 2f 6c 6f 6f 6b 75 70 0/lookup
0078: 00 00 00 00 00 00 00 00 ........
0080: 00 00 00 00 00 00 00 00 ........
0088: 00 00 00 00 00 00 00 00 ........
0090: 00 00 00 00 00 00 00 00 ........
0098: 00 00 00 00 00 00 00 00 ........
00a0: 00 00 00 00 00 00 00 00 ........
00a8: 00 00 00 00 00 00 00 00 ........
00b0: 00 00 00 00 00 00 00 00 ........
00b8: 00 00 00 00 00 00 00 00 ........
00c0: 00 00 00 00 00 00 00 00 ........
00c8: 00 00 00 00 00 00 00 00 ........
00d0: 00 00 00 00 00 00 43 45 ......CE
00d8: 54 00 00 0a 00 03 00 00 T.......
00e0: 0e 10 43 45 53 54 00 03 ..CEST..
00e8: 00 02 00 00 1c 20 ......
Position Length Information
===================================================
0012 1 Is Portal Enabled
0013-0033 32 Pushbutton Up config
0034-0054 32 Pushbutton down config
0055-00D4 127 Portal URL
00D5-00DA 5 TimeZone (Winter)
00DB-00DB 1 TimeZone (Winter) - Month
00DC-00DC 1 TimeZone (Winter) - Weekday
00DD-00DD 1 TimeZone (Winter) - Hour
00DE-00E1 4 TimeZone (Winter) - offset to UTC
00E2-00E6 5 TimeZone (Daylight Savings)
00E7-00E7 1 TimeZone (Daylight Savings) - Month
00E8-00E8 1 TimeZone (Daylight Savings) - Weekday
00E9-00E9 1 TimeZone (Daylight Savings) - Hour
00EA-00ED 4 TimeZone (Daylight Savings) - offset to UTC
The first 18 bytes seem to contain the same type of information for all devices (except the Cube which seems to have one difference). The rest of the information is device specific.
So the first 18 bytes contain the following information
Position Length Information
===================================================
00 1 Data Length
01 3 Address of device
04 1 Device Type
05 1 Room ID
06 1 Firmware version
07 1 Test Result
08 10 Serial Number
The device specific bytes contain the following information
Pos Len Information
================================================================
12 1 Comfort Temperature in degrees celsius * 2
13 1 Eco Temperature in degrees celsius * 2
14 1 Max Set Point Temperature in degrees celsius * 2
15 1 Min Set Point Temperature in degrees celsius * 2
16 1 Temperature offset in degrees celsius * 2 + 3,5
17 1 Window Open Temperature in degrees celsius * 2
18 1 Window Open Duration in minutes * 5
19 1 Boost 3 MSB bits are duration:
value is in minutes * 5
but value 7 means 60 min.
5 LSB bits are valve opening
in % * 5
1a 1 Decalcification 3 MSB bits are day of week:
Saturday = 0 etc.
5 LSB bits are time in hours
1b 1 Max Valve Setting in % * 255 / 100 (so to get
valve setting use
value * 100 / 255)
1c 1 Valve Offset in % * 255 / 100
1d 182 Weekly Program Schedule of 26 bytes for
each day starting with
Saturday. Each schedule
consists of 13 words
(2 bytes) e.g. set points.
1 set point consist of
7 MSB bits is temperature
set point (in degrees * 2)
9 LSB bits is until time
(in minutes * 5)
For the above example data this translates to
Raw Decoded
================================================================
Comfort Temp 24 18 degrees Celsius
Eco Temp 20 16 degrees Celsius
Max Temp 3d 30,5 degrees Celsius
Min Temp 09 4,5 degrees Celsius
Temp Offset 07 0 degrees Celsius
Win Open Temp 18 12 degrees Celsius
Win Open Dur 03 15 minutes
Boost f4 111 10100 -> 60 minutes, 100 %
Decal 0c 000 01100 -> Saturday, 12:00 hours
Max Valve ff 100 %
Valve offset 00 0 %
Weekly program 41 20 0100000 100100000
-> 16 degrees, until 24:00
etc.
===============================================================
12 1 Comfort Temperature in degrees celsius * 2
13 1 Eco Temperature in degrees celsius * 2
14 1 Max Set Point Temperature in degrees celsius * 2
15 1 Min Set Point Temperature in degrees celsius * 2
1d 182 Weekly Program Schedule of 26 bytes for
each day starting with
Saturday. Each schedule
consists of 13 words
(2 bytes) e.g. set points.
1 set point consist of
7 MSB bits is temperature
set point (in degrees * 2)
9 LSB bits is until time
(in minutes * 5)
cc 3 Unknown
For the above example data this translates to
Raw Decoded
================================================================
Comfort Temp 24 18 degrees Celsius
Eco Temp 20 16 degrees Celsius
Max Temp 3d 30,5 degrees Celsius
Min Temp 09 4,5 degrees Celsius
Weekly program 41 20 0100000 100100000
-> 16 degrees, until 24:00
etc.