miio 0.2.0

Dart implementation for Xiaomi MIIO LAN protocol.

MIIO

Dart implementation for MIIO LAN protocol.

The protocol an encrypted, binary protocol based on UDP (port 54321), which is used to configure & control smart home devices made by Xiaomi Ecosystem.

Protocol

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Magic Number = 0x2131         | Packet Length (incl. header)  |
|-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-|
| Unknown                                                       |
|-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-|
| Device ID ("did")                                             |
|-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-|
| Stamp                                                         |
|-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-|
| MD5 Checksum                                                  |
| ... or Device Token in response to the "Hello" packet         |
|-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-|
| Optional variable-sized payload (encrypted)                   |
|...............................................................|


Packet Length: 16 bits unsigned int
    Length in bytes of the whole packet, including header(0x20 bytes).

Unknown: 32 bits
    This value is always 0.
    0xFFFFFFFF in "Hello" packet.

Device ID: 32 bits
    Unique number. Possibly derived from the MAC address.
    0xFFFFFFFF in "Hello" packet.

Stamp: 32 bit unsigned int
    Continously increasing counter.

MD5 Checksum:
    Calculated for the whole packet including the MD5 field itself,
    which must be initialized with token.

    In "Hello" packet,
    this field contains the 128-bit 0xFF.

    In the response to the first "Hello" packet,
    this field contains the 128-bit device token.

Optional variable-sized payload:
    Payload encrypted with AES-128-CBC (PKCS#7 padding).

        Key = MD5(Token)
        IV  = MD5(MD5(Key) + Token)