Cubean

Cubean TX Protocol (Controller → Roaster)
Direction: Arduino/controller → Cubean roaster
Rate: 
9600 baud, 8 data bits, no parity, 1 stop bit (
SERIAL_8N1)
Interval: Sent every ~200ms
Packet Length: 11 bytes
Structure:
Byte Index
Hex
Meaning
0
FE
Start byte 1
1
EF
Start byte 2
2
00
Unused/reserved
3
00
Unused/reserved
4
5A
Drum/Cooler/Fan state (bitfield?)
5
64
Heat power (0–100 decimal)
6
02
Unknown, possibly a mode ID
7
76
Fan speed (0–255 scale)
8
AA
Marker
9
55
Marker
10
22
Checksum or end byte
Cubean RX Protocol (Roaster → Controller)
Direction: Cubean roaster → Arduino/controller
Rate: Same UART config: 
9600 baud, 
SERIAL_8N1
Interval: ~200ms
Packet Length: 11 bytes
Structure:
Byte Index
Hex
Meaning
0
FE
Start byte 1
1
EF
Start byte 2
2
0X
Temperature high nibble (BCD/hex?)
3
YY
Temperature low nibble
4
00
Unknown
5
00
Unknown
6
00
Possibly status byte
7
00
Possibly another status byte
8
AA
Marker
9
55
Marker
10
XX
Checksum or data byte