Bluetooth write

.kt

suspend fun Peripheral.write(
    characteristic: Characteristic,
 data: ByteArray,
 mtuSize: Int
): ByteArray  =
    observe(characteristic) {
 if (data.size > (mtuSize - 3) ) {
            Napier.d("data size is bigger than mtu, chunk it and write it")
            data.chunkAndEach(mtuSize - 3) {
 if(it.size == (mtuSize - 3)) {
                    write(characteristic, it, WriteType.WithoutResponse)
                } else {
                    write(characteristic, it, WriteType.WithResponse)
                }
 }
 } else {
            Napier.d("data size is smaller than maxWriteSize,write it directly")
            write(characteristic, data, WriteType.WithResponse)
        }
 }
 .transformWhile {
 Napier.d(
 "takeWhile: size:${it.size}" + " Cadena: " + it.decodeToString(
 throwOnInvalidSequence = true
 )
            )
            emit(it)
            !it.isMtuSizeReached(mtuSize)
 }.fold(byteArrayOf()) { initial, value ->
 val concat = initial.plus(value)
            concat
 }