export function hexStringToByteArray (hexString) {
  let byteArray = []
  for (let i = 0; i < hexString.length; i += 2) {
    let byte = parseInt(hexString.substr(i, 2), 16)
    byteArray.push(byte)
  }
  return byteArray
}
export function getDataView (value) {
  let uint8Buf = Array.from(value)
  var encodedCmds = new ArrayBuffer(uint8Buf.length)
  var dataView = new DataView(encodedCmds)
  for (var j = 0; j < uint8Buf.length; j++) {
    dataView.setUint8(j, uint8Buf[j])
  }
  return encodedCmds
}