Cbor support

[akelix]

Cbor support could be added.

fun ByteArray.toSenmlRecords(): List{
return try {
Cbor {
ignoreUnknownKeys = true
}.decodeFromByteArray(this)
} catch (e: kotlinx.serialization.SerializationException) {
Napier.e { e.message ?: "Unknown exception while deserializing SenML pack" }
emptyList()
}
}

[bobeal]

Indeed, it seems that kotlinx.serialization has support for Cbor in its newer versions (https://kotlinlang.org/api/kotlinx.serialization/kotlinx-serialization-cbor/kotlinx.serialization.cbor/).

Will look out how to integrate this into the lib.

[akelix]

Turns out it's not that easy.
There are a few problems:

• CBOR serialization from Jetbrains does not support non-string keys ISSUE
• No support of Number deserialization (for example baseTime and Time could be Long and Double)
• If you use Double and Long in Serializable object it wil not be optimized according to actual value (For example if you use value:Long = 1 it will be serialized as Long not as Byte)

https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/formats.md#cbor-experimental