After digging into the documentation and the source code, I noticed that the current implementation does not support sending the Generic Delta (Generic Level) messages. The GenericLevelSet message sends the level with only 2 bytes(Mesh Model Spec, 3.2.2.2) without a simple way to morph the level message into delta, while delta messages require 4 bytes(Mesh Model Spec, 3.2.2.4) for the payload.
The solution seems to be pretty straightforward, we can have a class that duplicates the GenericLevelSet interface (let's say GenericLevelDeltaSet) with a different opCode (0x8209), and instead of sending the level with 2 bytes, we can have a delta field of 4 bytes.
Currently, as an alternative, I use a hack like this one:
class GenericLevelDeltaSet(
appKey: ApplicationKey,
delta: Int,
tId: Int,
transitionSteps: Int? = null,
transitionResolution: Int? = null,
delay: Int? = null,
) : GenericUserPropertySet(appKey,
(delta and 0xFFFF).toShort(),
if (transitionSteps == null || transitionResolution == null || delay == null) {
ByteArray(3).apply {
set(0, (((delta shr 16) and 0xFF).toByte()))
set(1, (((delta shr 24) and 0xFF).toByte()))
set(2, ((tId and 0xFF).toByte()))
}
} else {
ByteArray(5).apply{
set(0, (((delta shr 16) and 0xFF).toByte()))
set(1, (((delta shr 24) and 0xFF).toByte()))
set(2, ((tId and 0xFF).toByte()))
set(3, ((((transitionResolution shl 6) or transitionSteps) and 0xFF).toByte()))
set(4, ((delay and 0xFF).toByte()))
}
}) {
override fun getOpCode(): Int {
return 0x8209 // Generic Delta Set
}
}In the hack above, I split the delta into "propertyId" and "values" fields.
In general, having a generic application message class for extension would be great (let's say making ApplicationMessage public), that way you can introduce a predictable way for extending the supported messages list.
After digging into the documentation and the source code, I noticed that the current implementation does not support sending the Generic Delta (Generic Level) messages. The GenericLevelSet message sends the level with only 2 bytes(Mesh Model Spec, 3.2.2.2) without a simple way to morph the level message into delta, while delta messages require 4 bytes(Mesh Model Spec, 3.2.2.4) for the payload.
The solution seems to be pretty straightforward, we can have a class that duplicates the GenericLevelSet interface (let's say GenericLevelDeltaSet) with a different opCode (0x8209), and instead of sending the level with 2 bytes, we can have a delta field of 4 bytes.
Currently, as an alternative, I use a hack like this one:
In the hack above, I split the delta into "propertyId" and "values" fields.
In general, having a generic application message class for extension would be great (let's say making ApplicationMessage public), that way you can introduce a predictable way for extending the supported messages list.