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Fix protocol description (#125)

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* Fix discovery packet format description

* fix MAC address offset

* Command packet format description

* Data description
This commit is contained in:
Michael Kaiser 2017-11-25 21:14:12 +01:00 committed by Matthew Garrett
parent 2160488da2
commit 71f320638e
1 changed files with 13 additions and 13 deletions
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26
protocol.md
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@ -40,13 +40,14 @@ To discover Broadlink devices on the local network, send a 48 byte packet with t
|0x00-0x07|00|
|0x08-0x0b|Current offset from GMT as a little-endian 32 bit integer|
|0x0c-0x0d|Current year as a little-endian 16 bit integer|
|0x0e|Current number of minutes past the hour|
|0x0f|Current number of hours past midnight|
|0x10|Current number of years past the century|
|0x11|Current day of the week (Monday = 0, Tuesday = 1, etc)|
|0x0e|Current number of seconds past the minute|
|0x0f|Current number of minutes past the hour|
|0x10|Current number of hours past midnight|
|0x11|Current day of the week (Monday = 1, Tuesday = 2, etc)|
|0x12|Current day in month|
|0x13|Current month|
|0x19-0x1b|Local IP address|
|0x14-0x17|00|
|0x18-0x1b|Local IP address|
|0x1c-0x1d|Source port as a little-endian 16 bit integer|
|0x1e-0x1f|00|
|0x20-0x21|Checksum as a little-endian 16 bit integer|
@ -61,7 +62,7 @@ Response (any unicast response):
| Offset | Contents |
|---------|----------|
|0x34-0x35|Device type as a little-endian 16 bit integer (see device type mapping)|
|0x3a-0x40|MAC address of the target device|
|0x3a-0x3f|MAC address of the target device|
Device type mapping:
@ -107,20 +108,19 @@ The command packet header is 56 bytes long with the following format:
|0x08-0x1f|00|
|0x20-0x21|Checksum of full packet as a little-endian 16 bit integer|
|0x22-0x23|00|
|0x24|0x2a|
|0x25|0x27|
|0x24-0x25|Device type as a little-endian 16 bit integer|
|0x26-0x27|Command code as a little-endian 16 bit integer|
|0x28-0x29|Packet count as a little-endian 16 bit integer|
|0x2a-0x2f|Local MAC address|
|0x30-0x33|Local device ID (obtained during authentication, 00 before authentication)|
|0x34-0x35|Checksum of packet header as a little-endian 16 bit integer
|0x34-0x35|Checksum of unencrypted payload as a little-endian 16 bit integer
|0x36-0x37|00|
The payload is appended immediately after this. The checksum at 0x34 is calculated *before* the payload is appended, and covers only the header. The checksum at 0x20 is calculated *after* the payload is appended, and covers the entire packet (including the checksum at 0x34). Therefore:
The payload is appended immediately after this. The checksum at 0x20 is calculated *after* the payload is appended, and covers the entire packet (including the checksum at 0x34). Therefore:
1. Generate packet header with checksum values set to 0
2. Set the checksum initialisation value to 0xbeaf and calculate the checksum of the packet header. Set 0x34-0x35 to this value.
3. Append the payload
2. Set the checksum initialisation value to 0xbeaf and calculate the checksum of the unencrypted payload. Set 0x34-0x35 to this value.
3. Encrypt and append the payload
4. Set the checksum initialisation value to 0xbeaf and calculate the checksum of the entire packet. Set 0x20-0x21 to this value.
Authorisation
@ -180,7 +180,7 @@ Send the following payload with a command byte of 0x006a
|0x04|0x26 = IR, 0xb2 for RF 433Mhz, 0xd7 for RF 315Mhz|
|0x05|repeat count, (0 = no repeat, 1 send twice, .....)|
|0x06-0x07|Length of the following data in little endian|
|0x08 ....|Pulse lengths in 32,84ms units (ms * 269 / 8192 works very well)|
|0x08 ....|Pulse lengths in 2^-15 s units (µs * 269 / 8192 works very well)|
|....|0x0d 0x05 at the end for IR only|
Each value is represented by one byte. If the length exceeds one byte