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BuffaloC4

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Posts posted by BuffaloC4

    Intrinsic AppleTV Driver NOT compatible with TVOS 15

    in General Control4 Discussion

    Posted

    23 minutes ago, Rexabyte said:

    I haven't touched the API in question but I can hopefully explain the time things can take and libraries.

    A while ago I wanted to create an Xbox driver that works over the SmartGlass protocol. While this would be relatively easy if you had the SDK that Microsoft provides it is much more difficult in a sandboxed environment (Control4) where you cannot use the SDK provided by Microsoft. Instead you need to work with the raw protocol (bits and bytes) and write all of the logic required just to even communicate to the Xbox. Sometimes you can find opensource MIT licensed code to do portions of what you need, other times you need to write it yourself.

    So what would it take to write everything required where the libraries don't exist in Control4? Let's start with JUST the crypto portion: https://openxbox.org/smartglass-documentation/cryptography/#key-exchange

    • On Discovery, the console responds with a Discovery Response including a certificate, this certificate holds the console's public key.
    • The client generates elliptic curve and derives the shared secret with console's public key using ECDH and a randomly generated public/private keypair
    • The shared secret is salted using static salts, see KDF Salts
    • The salted shared secret is hashed using SHA-512
    • The salted & hashed shared secret is split into the following individual keys:
    • bytes 0-16: Encryption key (AES-128-CBC)
    • bytes 16-32: Initialization Vector key (AES-128-CBC)
    • bytes 32-64: Hashing key (HMAC-SHA-256)
    • The client's public key is sent inside the Connect Request message to the console

    First things first we need to get the public key from the certificate. So we need to parse out the response and format it. It's received in an ASN. The following code (incomplete, needs to support more types, also using a custom library, BitHelper, to read bits and bytes) is used just to parse the ASN to get the public key used in step 2. After that we still need to do encryption using ECDH, which if not supported in Control4's encryption methods also needs to be written or sourced from somewhere. This can go on and on.
      

    
ASN = (function()
    local class = {}; class.__index = class

    local Types = {
        BOOLEAN  = 0x01,
        INTEGER  = 0x02,
        STRING   = 0x03,
        OCTET    = 0x04,
        NULL     = 0x05,
        OBJECT   = 0x06,
        UTF8String = 0x0C,
        IA5STRING= 0x16,
        SEQUENCE = 0x30,
        SET      = 0x31,
    }

    class.Map = {
        [0x01] = "DecodeBoolean",
        [0x02] = "DecodeInteger",
        [0x03] = "DecodeString",
        [0x04] = "DecodeOctet",
        [0x05] = "DecodeNull",
        [0x06] = "DecodeObject",
        [0x0C] = "DecodeUTF8String",
        [0x13] = "DecodeUTF8String",
        [0x16] = "DecodeIA5String",
        [0x17] = "DecodeUTCTime",
        [0x30] = "DecodeSequence",
        [0x31] = "DecodeSet",
    }

    class.Class = {
        ["Universal"] = 0,
        ["Application"] = 1,
        ["Context"] = 2,
        ["Private" ] = 3
    }

    function class.DecodeSet(data, pos)
        Logger.Trace("ASN.DecodeSet: " .. pos)
        pos, l = class.DecodeLength(data, pos)
        pos, d = BitHelper.GetString(data, pos, l)

        local p, obj = class.Parse(d)

        return pos, obj
    end

    function class.DecodeOctet(data, pos)
        local l,d

        pos, l = class.DecodeLength(data, pos)
        pos, d = BitHelper.GetString(data, pos, l)

        return pos, d
    end

    function class.DecodeUTCTime(data, pos)
        Logger.Trace("ASN.DecodeUTCTime")

        pos, length = class.DecodeLength(data, pos)

        --print("STRING LENGTH: " .. length)

        pos, str = BitHelper.GetString(data, pos, length)

        --print("STRING: " .. str)

        return pos, str
    end

    function class.DecodeString(data, pos)
        Logger.Trace("ASN.DecodeString")

        pos, length = class.DecodeLength(data, pos)

        --print("STRING LENGTH: " .. length)

        pos, str = BitHelper.GetString(data, pos, length)

        --print("STRING: " .. str)

        return pos, str
    end

    function class.DecodeUTF8String(data, pos)
        Logger.Trace("ASN.DecodeUTF8String")

        pos, length = class.DecodeLength(data, pos)

        --print("STRING LENGTH: " .. length)

        pos, str = BitHelper.GetString(data, pos, length)

        --print("STRING: " .. str)

        return pos, str
    end

    function class.DecodeLength(data, pos)
        Logger.Trace("ASN.DecodeLength")

        local length = nil

        pos, length = BitHelper.GetInt8(data, pos)

        local isLong = bit.band(length, 0x80) ~= 0

        --print("LONG: " .. tostring(isLong))

        if (isLong) then
            local bytes = bit.band(length, 0x7F)

            Logger.Debug("BYTES: " .. bytes)
            Logger.Debug(hexdump(string.sub(data, pos, pos + bytes - 1)))

            if (bytes == 1) then
                pos, length = BitHelper.GetInt8(data, pos)
            elseif (bytes == 2) then
                pos, length = BitHelper.GetInt16(data, pos)
            elseif (bytes == 4) then
                pos, length = BitHelper.GetInt32(data, pos)
            else
                Logger.Error("BAD LENGTH")
            end

            --print("LENGTH: " .. length)
        else
            Logger.Debug("LENGTH: " .. length)
            Logger.Debug(hexdump(string.sub(data, pos - 1, pos)))
        end

        return pos, length
    end

    function class.DecodeSequence(data, pos)
        Logger.Trace("ASN.DecodeSequence: " .. pos)
        --print(hexdump(string.sub(data, pos)))

        pos, l = class.DecodeLength(data, pos)
        pos, d = BitHelper.GetString(data, pos, l)

        local p, obj = class.Parse(d)

        return pos, obj
    end

    function class.DecodeSequenceOf()

    end

    function class.DecodeInteger(data, pos)
        Logger.Trace("ASN.DecodeInteger")

        local start = pos

        pos, length = class.DecodeLength(data, pos)

        if (length == 1) then
            return BitHelper.GetInt8(data, pos)
        elseif (length == 2) then
            return BitHelper.GetInt16(data, pos)
        elseif (length == 4) then
            return BitHelper.GetInt32(data, pos)
        else
            return BitHelper.GetString(data, pos, length)
        end
    end

    function class.DecodeContext(data, pos)
        Logger.Trace("ASN.DecodeContext")

        local length, d

        pos, length = class.DecodeLength(data, pos)
        pos, d = BitHelper.GetString(data, pos, length)

        local _, obj = class.Parse(d)

        return pos, obj
    end

    function class.DecodeObject(data, pos)
        Logger.Trace("ASN.DecodeObject")

        local length = 0

        pos, length = class.DecodeLength(data, pos)

        local d = string.sub(data, pos, pos + length)

        local p, firstByte = BitHelper.GetInt8(d)

        local firstDigit = firstByte / 40;
        local secondDigit = firstByte % 40;
        local nodes = { firstDigit, secondDigit }

        -- TODO: Determine OID value

        return pos + length, d
    end

    function class.DecodeNull(data, pos)
        pos, length = class.DecodeLength(data, pos)

        return pos, false
    end

    function class.DecodeBoolean(data, pos)
        Logger.Trace("ASN.DecodeBoolean")

        pos, length = class.DecodeLength(data, pos)
        pos, d = BitHelper.GetInt8(data, pos)

        return pos, d
    end

    function class.DecodeChoice()

    end

    function class.Parse(certificate, pos)
        Logger.Trace("ASN.Parse")

        local pos = pos or 1
        local limit = 1
        local obj = {}

        while (pos < #certificate) do
            local t, l, d

            pos, t = BitHelper.GetInt8(certificate, pos)

            local f = bit.rshift(bit.band(t, 0x20), 5)
            local c = bit.rshift(bit.band(t, 0xC0), 6)

            local method = class.Map[t]

            if (method and class[method]) then
                Logger.Trace(method)

                pos, d = class[method](certificate, pos)

                obj[#obj + 1] = d
            else
                if (c == class.Class.Context) then
                    pos, d = class.DecodeContext(certificate, pos)
                else
                    Logger.Error("BAD METHOD: " .. t)
                end
            end
        end
        return pos, obj
    end

    local mt = {
        __call = function(self)
            local instance = {}

            setmetatable(instance, class)

            return instance
        end,
    }

    setmetatable(class, mt)

    return class
end) ()



     

    Did you ever get this working? 
    I bet people would employ you to do an Xbox driver for them. I know I would. 

    HDMI lengths/HDR/4k

    in Question & Answer

    Posted

    I have a 6x6 Kramer Matrix running 4 x 50ft runs and 2x 75 ft runs. I feel like I may have gotten somewhat lucky with my experience , but I assume you'll get away with a 20 ft run. Many, many, many people will try to influence you to go the balun route. 

    New Home Buildout

    in General Control4 Discussion

    Posted

    Definitely go with video matrix. What's the point of having such a unified solution and not have the ability to sync up all tv's in the house. 
     

    the feature is a must for parties. Even guests using my bathroom get to view the music videos that I play during gathering. 
     

    I also only have to rent one cable box from my provider. 
     

    also TVs that sync is also great while cleaning the house. Put on a show or video throughout and enjoy it in each room. Very wasteful, but hey... c4....

    External Thermistors Max Reading

    in General Control4 Discussion

    Posted

    Is there a temperature ceiling or max reading when using an external thermistor with a z2io. I know the internal thermistor max is like 105, but I'd like to get a heavy duty external one to measure something that gets to like 300/400 degrees. 
     

    it is to ensure a clients pot (medicine) smoking device gets turned off.
     

    thanks for any and all feedback. 

    WTB 2x Zigbee Deadbolts Immediately

    in Wanted

    Posted

    I tried to go the consumer route and grab z-wave locks and identify them with some online kwikset z wave driver... no surprise... they don't identify correctly. (Ea-3 w/ dongle) 

    while work is being done in these areas I really need replacement zigbee deadbolts. 
     

    or if anyone might understand why my current locks keep saying they have been identified but to a driver that does not match in pro. 
     

    Thanks! 
     

    I'm in western New York area. 

    HC-250 in Slave Mode

    in Question & Answer

    Posted

    Just now, msgreenf said:

    sorry, ask your question again - you can have 2 250's in a project no problem.  (i have an extra to sell cheap)

    Thanks for your time, Msgreenf, what os is required to have a project with 2x HC-250 and no 800. 
     

    I don't want to have to buy my parents an 800 just to control their minuscule setup. 

     

    They already have 1 HC-250 and I'll add the 2nd tomorrow if it's possible.
     

    unfortunately I already got a 250 and SR260 from eBay for nearly nothing. 

     

    thanks again, 

    The Madia's

    HC-250 in Slave Mode

    in Question & Answer

    Posted

    On 2/7/2020 at 5:19 PM, Matt Lowe said:

    OS 3. gives you a lot more customization options over the app is one that got a major overhaul. 

    My nearly 80 year old parents have no need for OS3. (I love it) Can I add a second HC-250 onto a system directed by an HC-250?

    Does anyone recall which OS allowed for this ? I remember when I started with C4, a 800 was necessary to "enslave" HC-250s

    however, I somewhat remember a loosening of restrictions on 250s when OS3 came out. 
     

    ugh. I really don't want to buy them an 800. Their system is minuscule. 
     

    thanks 

    JM

    Analog output switches to 0 volume

    in Troubleshooting, Workarounds, & Bugs

    Posted

    3 hours ago, WholeHomeControl said:

    I’ve seen this issue as well and don’t have a fix. 
     

    As a workaround, however, this might help:

    Set the EA-3 audio output as the audio end point for a hidden room. Now, you have a way programmatically to get that volume level back up to 100% (ie custom button first plays EA3 source in room and then set volume to 100%. Then turn off room.)

    I tried to replicate such binding in my personal system. Didn't expose the set volume value. 
     

    Anyone else experiencing this? Enough support to hear from c4 maybe? 

    Analog output switches to 0 volume

    in Troubleshooting, Workarounds, & Bugs

    Posted

    Occasionally I go to play pandora or some other native service on my EA-3 analog output -> to matrix amp and I get no sound.

    every single time the problem has been that the output switches to 0 volume. (not on navigators, but in the properties of my EA-3).

    happens once a week. I even tried making a custom button to just circumvent the problem, but I don't believe the programming is exposed. 
     

    Side note: the controller also occasionally requires a reboot to get IO board working. Maybe 4 times a year. 
     

    unit was part of the first shipment of EAs so likely no warranty. 
     

    All thoughts and considerations are appreciated, 

     

    JM
     

     

    DVC Wiring

    in General Control4 Discussion

    Posted

    Does anyone have a wiring diagram that would explain how to wire 2 dvc speakers to a single amplifier LR zone. Both speakers need signal from both L and R? 
     

    cant find a diagram online anywhere. 
     

    thanks in advance! 

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