This repo is outdated and no longer maintained. Most of the things I've learned about the protocol have flown into homebridge-yeelight

NOTE: Code snippets are in Swift since I'm reversing the iOS App

Service UUID: 8E2F0CBD-1A66-4B53-ACE6-B494E25F87BD

Characteristics UUID: AA7D3F34-2D4F-41E0-807F-52FBF8CF7443

So far it seems like the hex command length is always 18 Bytes. We need to pad out the string with 0.

func formatCommandString(string: NSString, length: Int = 36) -> NSString {
    return string.stringByReplacingOccurrencesOfString(" ", withString: "")
            .stringByPaddingToLength(length, withString: "0", startingAtIndex: 0)
}

Register for Notify on 8F65073D-9F57-4AAA-AFEA-397D19D5BBEB

When receiving a notification, the first bytes define what is being received

• 4363.. Device Status
  • 01 Unauthorized/Not paired
  • 02 Authorized/Paired
  • 04 Authorized device (UDID)
  • 07 Lamp disconnect imminent

To Pair with the device,send the 4367 command with a client uuid. Example: 43677207d94ecb9e4ec5be6eafa46ed1c07c

The Lamp will notify with 43 63 01 to signal that it is in pairing mode.

Press the Scene Button on your Lamp to pair.

The Lamp will notify with 43 63 02 to confirm successful pairing

If the Lamp was previously paired with the device, it will notify 43 63 04

The On/Off state can be switched with the 4340.. command. 434001 will turn it on, 434002 will turn it off

func changeColorString(red: Int, green: Int, blue: Int, brightness: Int = 0) -> NSString {
    //not sure what the 4th param does yet, also setting brightness to 0 will have no effect
    return NSString(format: "4341 %02X %02X %02X %02X %02X", red, green, blue, 0, brightness)
}

Formatted Example: 4341FF00D700000000000000000000000000

Temperature can range from 1700 to 6500

func changeTempBrightnessString(temperature: Int, brightness: Int = 0) -> NSString {
    return NSString(format: "4343 %04X %02lX", temperature, brightness)
}

Formatted Example: 434313886400000000000000000000000000

• Disconnect: 4368
• Read color flow: 434c %02lx
• Delete color flow: 4373 %02lx
• Read lamp name: 4352
• Get statistics Data: 438c
• Set delay to off: 437f01%02x Will add more soon...