var SerialPort = require('serialport')

port = new SerialPort("/dev/serial0", { baudRate: 9600 })
port.on('error', function (err) {
	console.log(`Error: ${err.message}`)
})

function showPortOpen() {
	console.log('port open. Data rate: ' + port.baudRate);
  }
   
  function showPortClose() {
	console.log('port closed.');
  }
   
  function showError(error) {
	console.log('Serial port error: ' + error);
  }

  receivedData=Buffer.alloc(0)
  port.on('open', showPortOpen);
  port.on('readable', function () {
    received = port.read()
    receivedData = Buffer.concat([receivedData,received])
    console.log('Data:', received)
    if(receivedData.length > 8)
    {
      console.log('total:', receivedData)
      receivedData=Buffer.alloc(0)
         
    }

})

port.on('close', showPortClose);
port.on('error', showError);
ergebnis=port.read()